YC-2000 Vacuum Spray Dryer

  • Laboratory vacuum low temperature spray dryer, the best choice for heat sensitive materials
  • Minimum inlet air temperature is up to 50 °C, the minimum outlet air temperature is 45 °C, suitable for materials such as probiotics.
  • Suitable for sugary materials such as Chinese herbal & juices, the dried materials(powder) will not stick to the wall.
  • Noise-reduction design with unique technology, vacuum pump has low noise.

Pilotech Vacuum Spray Dryer

YC-2000 vacuum spray dryer, with built-in low-noise water ring vacuum pump, which can minimize the inlet air temperature during spray drying.

The minimum inlet air temperature is as low as 50 °C, suitable for heat-sensitive materials such as dry probiotics, so as to well maintain the biological activity of materials. Also, it is suitable for materials such as heat-labile polymer materials.




Pilotech YC-2000 vacuum spray dryer



7KW,380V,50/60 Hz


Evaporating Capacity

1000~1500ml/h for water


mini. Input temperature



Heater power



Spray gas

4.2mᶟ/h, 2-5bar


Nozzle jet

0.7mm standard/(0.5/0.75/1.0/1.5/2.0mm available)


Nozzle type

Two fluid nozzle


Possible particle size range



Operation mode



Max. Sample feed



Minimum sample volume



Spray chamber material

SUS 304 Stainless steel


Inlet temperature



Cyclone separator material

SUS-304 Stainless steel


Body material

SUS-304 Stainless steel


Seal of cyclone/cylinder



Outlet temperature









7-Inch LCD display for Heat, Spray, Pump, Air pressure, de-blocker frequency

21Thermal protection

Blower does not stop until temp <90⁰C





Atomizer material

SUS 316 Stainless steel


Vacuum Spray Dryer: The Complete Buying Guide

Inlet air temperature of most spray dryers used in the lab is above 150°C, which should have no problem with ordinary samples. However, if used in materials that are easily affected by temperature, high temperature will lead to denaturation, discoloration, oxidation, and chemical reaction. In this case, our company’s YC-2000 vacuum spray dryer developed especially for such kind of heat-sensitive materials is a good substitute for the common spray dryer.

Pilotech vacuum spray dryer is available in a mini size of 500ML/L, 1500ML/H and pilot scale of 3000ML/H. Our mini vacuum spray dryer with modular design is divided into a general mini spray dryer and a vacuum module, which can be used for drying general materials in high temperature and for drying heat-sensitive materials by connecting to the vacuum module.

A combination of spray drying and vacuum drying is designed ingeniously in the Pilotech YC-2000 vacuum spray dryer based on the principle of boiling point depression. By doing so, the inlet air temperature is decreased from 150°C to 50°C, while the outlet temperature is below 45°C.

Pilotech YC-2000 vacuum spray dryer is applicable in industries such as enzyme preparation, probiotics, heat-sensitive high polymer materials, biological products, and pharmaceuticals, etc.

The frame of YC-2000 vacuum spray dryer is made of SUS304 stainless steel; the spray nozzle is made of SUS316L stainless steel; the drying chamber, the cyclone separator, the collecting bottle, and the collecting tube are made of SUS304 stainless steel, can also be made of SUS316L stainless steel if necessary.

Pilotech YC-2000 vacuum spray dryer is equipped with a PLC and a 7-inch color touch screen. Both PLC and the touch screen are from internationally famous brands. Also, the temperature is controlled accurately with PID temperature control.

Pilotech YC-2000 vacuum spray dryer as a low temperature spray dryer, is suitable for sticky materials. The dried materials do not stick on the wall with a high recovery rate reaching up to 85%.

In order to send you best vacuum spray dryers, we will carry out a series of strict tests including vacuum, noise, and temperature control accuracy test on each drier before shipment. We use heat sensitive materials in the test to ensure that the equipment you bought from us is of high quality, stable operation, safe and reliable.

If you’re looking for lab vacuum scale spray dryer manufacturer, if you’re looking for best price, then you’re in the right place, request a quick quote now.

Vacuum Spray Dryer: The Ultimate FAQs Guide

This guide will answer all questions you have about vacuum spray dryer.

If you want to learn about the components, working principle, nozzle types, material or optimizing performance, you will find all information here.

So, if you want to be an expert in this spray drying machine, read this guide.

What is Vacuum Spray Dryer?

Vacuum spray dryer refers to a type of spray drying equipment that featuring a low-pressure drying tower chamber.

Low pressure in the drying chamber boosts the thermodynamic parameters for removal of water, enabling drying at considerably reduced temperatures.

The spray dryer type is suitable for drying heat sensitive and hygroscopic substances.

 Vacuum spray dryer

 Vacuum spray dryer

What are the Features of Vacuum Spray Dryer?

  • Has Color Touch Screen HMI
  • Uses PLC System
  • Most have a collector, cyclone separator, spray chamber, and body made of Stainless steel
  • Inlet temperature range from 50-200 degrees Celsius

Which are the Main Components of Vacuum Spray Dryer?

The key parts of a vacuum spray dryer consist of the following:

Vacuum spray drying system

Vacuum spray drying system

1) Process Control Systems

Most types of vacuum spray dryers employ PLCs as the control system.

2) Feed Supply System

This the part where the concentration of raw material/feedstock takes place.

It comprises of the following components:

  • Feed tank(s)
  • Feed/Supply pump
  • High-pressure pump/Homogenizer
  • Filter
  • Concentrate heater
  • Feedline

3) Atomizer/Spray Nozzle

It is here where the vacuum spraying machine optimizes the process of evaporation.

The atomizer helps in the conversion of liquid suspension into fine droplets.

There exist three main types of spray nozzles used in vacuum spray dryer including:

  • Pressure nozzle atomizer
  • Rotary atomizer
  • Two-fluid nozzle atomizer

4) Heating System

The heating system supplies the hot air necessary for vacuum spray drying.

It employs either a direct or indirect method of heating.

Indirect heating, the air, and the heating source are in direct contact.

Conversely, with the indirect method, a heat exchanger helps in indirect heating of the drying air.

Here are the components of the heating system of a vacuum spray dryer:

  • Air Heater
  • Air Filter
  • Air Disperser
  • Supply Fan

Additionally, the most crucial variables in the hot air supply system are air flow rate, temperature and thermo-physical properties.

5) Drying Chamber

The process of vacuum spray drying takes place in this chamber.

It is where the spray dryer eliminates moisture from the feedthrough spraying it as tiny droplets into hot air.

You determine the size and measurements of the drying chamber by the type of raw material.

Moreover, feed and inlet heated air distribution also dictate the size and dimensions, in addition to the atomizer type and feed rate.

6) Powder Recovery Systems

Applying centrifugal force, the system separates the fine powder leaving the vacuum spray dryer from the hot drying air.

Here are the different types of powder recovery systems you can use in vacuum spray drying equipment:

  • Wet Scrubber
  • Bag filter
  • Cyclone
  • Combinations of the three

7) Powder return System and Powder After-Treatment System

They include the following system

  • Powder sieve
  • Fluid bed dryer or cooler
  • Pneumatic conveying and cooling
  • Lecithin treatment System

How Does a Vacuum Spray Dryer Work?

A vacuumspray drying machine is ideal for drying thermally sensitive materials and substances that are prone to absorbing moisture from air.

It operates by developing a vacuum to decrease the pressure in the spraying chamber below the water vapor pressure.

Consequently, the pressure drop results in the boiling of water, which in turn increases the rate at which the equipment dries products.

Other typical working principles of spray dryers remain the same including:


The vacuum spray dryer works by atomizing the feed and contacting the atomized liquid with hot air.

The atomizer serves various purposes including metering flow into the drying chamber, producing droplets of the desired size.

More it also ensures uniform distribution of the liquid droplets within the drying chamber.

The atomization stage creates the optimum environment for evaporation.

This results in a dried powder featuring the desired properties.

Rotary atomizers and pressure nozzles help in the spray formation.

Vacuum spray dryer can have just a single to over 100 spray nozzles.

Droplet-Air Contact

In the drying chamber, the system brings into contact the atomized liquid with hot air at a vacuum.

This vaporizes 95 percent of moisture in the droplets within seconds.

The manner in which spray media interacts with hot air within the vacuum spray drying machine affects droplet behavior during the drying stage.

The interaction has a direct effect on the dried product properties.

Atomizer position with respect to the air inlet determines the contact type between the air and spray.

The location of the nozzle headers are normally at the vacuum spray dryer top and spray down.

Droplet Drying

Evaporation of moisture happens in 2 stages.

In the initial step, the saturated air temperature at the droplet surface is roughly equal to the drying air temperature.

There exist adequate moisture within the droplet to substitute the evaporated fluid at the surface.

Furthermore, the process of evaporation happens at a comparatively uniform rate.

The second drying phase commences if there is no more sufficient water to sustain a saturated environment on the surface of the droplet.

Consequently, this leads to the formation of the dried shell at the droplet surface.

The rate of evaporation relies on the moisture diffusion via a dried shell that gets thicker during the process of drying.

Vaporization rate drops swiftly during the second stage of drying in a vacuum spray dryer.

Different products feature varying particle-forming attributes and evaporation. Some contract, others expand, disintegrate or crack.

The resulting particles might be comparatively homogenous hollow spherical partilces, or permeable and irregular-shaped products.

· Separation

After completion of drying, you must separate the product particles from the hot air.

The vacuum spray dryer achieves primary separation by the powder falling to the base of the drying chamber.

Some particles portion stay entrapped with the air, which you must recover in separation equipment.

You can utilize electrostatic precipitators, bag filters and cyclones for the ultimate separation stage.

Finally, use wet scrubbers to clean and cool the drying air before releasing it into the atmosphere.

What are the Advantages of Vacuum Spray Dryer?

The key benefits of vacuum spray dryer include:

  • It is energy efficient since it requires less energy for spray drying.
  • Performs drying faster than other types of spray drying machines.
  • Vacuum spray dryer is cost-effective due to its fast drying capability
  • Saves on processing times
  • Less damaging spray drying technique due to reduced dwell time and temperature.

What are the Applications of Vacuum Spray Dryer?

You can use a vacuum spray dryer in a broad range of applications requiring the creation of free-flowing powder.

The equipment has successfully processed substances in the following fields:

  • Chemical industry
  • Detergents, soaps and surface active agents
  • Dyestuffs and pigments
  • Blood
  • Organic chemicals such as Polymers and Resins
  • Food and Beverage products for example milk and egg products
  • Pharmaceutical products

How do you Specify Vacuum Spray Dryer?

Here are the key specifications of Vacuum Spray Dryer that you must look for:

  • Power
  • Evaporating Capacity
  • Minimum input temperature
  • Heater power
  • Spray gas
  • Nozzle jet
  • Nozzle type
  • Possible particle size range
  • Operation mode
  • Maximum Sample feed
  • Minimum sample volume
  • Spray chamber material
  • Inlet temperature
  • Cyclone separator material
  • Body material
  • Seal of cyclone/cylinder
  • Outlet temperature
  • Dimensions
  • Weight
  • Display
  • Thermal protection
  • Deblocking
  • Atomizer material

Which are the Materials you can Dry using Vacuum Spray Dryer?

Vacuum spray dryer machine

It is possible to dry the following materials using Vacuum spray drying equipment:

  • Heat-Sensitive materials like biological products including viable bacteria and enzymes preparation
  • Natural product extracts having high sugar content
  • Hygroscopic materials
  • Thermolabile polymer materials
  • Substances that gasify if they get in contact with heat

What is the Difference Between Vacuum Spray Dryer and Vacuum Freeze Dryer?

A vacuum freeze dryer involves a low-temperature dehydration operation.

It entails freezing the product, decreasing air pressure, and eventually eliminating the water through sublimation.

Though comparably new to the sector, the vacuum spray dryer offers some advantages, like the capacity to function with higher throughput.

The difference between the two types of vacuum drying equipment lie in:

Vacuum freeze dryer

 Vacuum freeze dryer

· Drying Process

Vacuum freeze dryers operates by initially freezing a product, often in a controlled way.

Freezing helps in manipulating the structure of the ice crystal of the product, which you then place in a vacuum.

At this point is where primary drying (sublimation) takes place, to eliminate the unbound water.

To help in the bound water sublimation, secondary drying follows, which takes the materials to a specified residual moisture level.

The vacuum freeze drying machine requires more energy in the secondary drying process since the target is bound instead of unbound.

This is because of the processing of increasing shelf temperatures to +20 degrees and low atmospheric pressure.

The goal is to transform ice straight into water vapor, avoiding the liquid phase.

The balance between vacuum and temperature ensures successful batch production post drying.

On the other hand, a vacuum spray dryer involves a simpler and quicker process.

It entails transforming a liquid suspension into dry powder in a single step.

The spray drying equipment atomizes the solution into fine droplets, which it quickly dry in a large chamber utilizing hot air.

A cyclone finally collects the resulting dry powder.

Though less costly, the main disadvantage of a vacuum spray dryer is the high processing shear force and temperature.

· Temperature

Products temperatures during primary drying in vacuum freeze dryer are usually below zero degree Celsius.

During secondary drying, the temperatures often range from 20 to 30 degrees Celsius.

Conversely, temperatures of products in vacuum spray dryers are often above 50 degrees Celsius.

The direct effect of such higher processing temperatures might be a general loss of:

  • Color/smell
  • Efficacy
  • Taste
  • Nutritional value, that is nutrients in foodstuff
  • Proteins degeneration
  • Biological yield (higher level of cells log reduction i.e. bacterial)

· Quality And Cost

Having the potential of larger throughput, you can consider vacuum spray dryers to be continuous process equipment.

This is different from the batch format related to the vacuum freeze-drying machine.

Although the initial cost of a vacuum spray dryer is usually low, this is not often the situation with more complex formulations.

Conversely, there is accurate regulation of low processing temperatures in the vacuum freeze dryer.

This reduces any risk on the intrinsic properties of the products.

The control prevents surpassing of glass transition temperature, collapse and eutectic melt.

In a vacuum freeze dryer, products that need several coating layers will have to undergo several coating operations.

These processes can be cost-prohibitive and time-consuming.

· Applications in Industry

You can use both types of industrial drying machine in a wide variety of applications.

Vacuum freeze dryers help in the preservation of injectable vaccines, food and dairy products, fine chemicals, and different cell types.

Moreover, vacuum freeze dryer is ideal for products that do not need extra processing after drying.

This is because it involves products that you directly fill into vials or other types of packages.

Further, it is possible to seal the vials within the lyophilizer, hence preventing potential contamination.

On the other hand, most people associate vacuum spray dryer with bulk instead of vial-based processing.

Nevertheless, it is a popular misconception that the drying machine is only appropriate for robust bulk pharmaceuticals and food products.

But, research show that it might be suitable for processing of some complex products.

For example, you can process nanoparticulates and microencapsulated bacteria.

vacuum spray dryer

 Mini vacuum spray dryer

What is the Material Used to Make Vacuum Spray Dryer?

Stainless steel is the most common material used for making the main parts of the vacuum spray dryer.

The main components include collector, cyclone separator, spray chamber, and body.

Moreover, it has a borosilicate sight glass window that allows you to inspect the entire vacuum spray drying process.

Which Parameters does the Touch Screen PLC System of Vacuum Spray Dryer Control?

The design of the vacuum spray dryer makes sure that it is easy to choose and adjust all operations.

Ensuring simple operation allows you to quickly attain optimum conditions for vacuum spray drying.

Using PLC system, the touch screen display allows you to manage the following parameters:

  • Inlet Temperature
  • Air compressor flow
  • Pump speed
  • Airflow Volume
  • De-blocker Frequency.

What is the Role of De-blocker in Vacuum Spray Dryer?

The spray assembly integrates an automatic de-blocking gadget that prevents blockage of the spray nozzles.

An integral compressor activates the de-blocking needle.

De-blocker is necessary when feedstock might solidify or large particles lead to blockage of the spray nozzle.

Which are the Types of Nozzles used in Vacuum Spray Dryer?

The choice of the spray drying machine nozzle to use depends on the following factors:

Spray dryer nozzle

Spray dryer nozzle

  • Feedstock
  • Desired powder properties
  • Capacity and type of vacuum spray dryer
  • The capacity of the spray nozzle

Here are the common types of spray nozzles utilized in vacuum spray dryer:

· Rotary Atomizers

This type of atomizer utilizes power from a high-speed spinning wheel to separate the feed formulation into droplets.

You inject the feedstock at the wheel center and it flows across the surface to the circumference.

As the liquid leaves the wheel, it separates into droplets.

· Pressure Nozzle

These are the most popular types of atomizers used in vacuum spray dryers.

Pressure nozzles often develop coarser, more free-flowing particles than rotary atomizers.

They are also known as “vortex” spray nozzles since they incorporate functionality that promotes the whirling of fluid flowing across them.

Some designs utilize slotted cores or vanes to produce the vortex.

However, the drawback of the slotted nozzle design is that it is susceptible to blockage and untimely wear.

The whirling liquid enables the atomizer to transform the potential energy of formulation subjected to pressure to kinetic energy around the nozzle orifice.

It does this through the formation of a slim, high-speed layer around the spray nozzle exit.

While leaving the nozzle, the unsteady layer disintegrates, initially forming ligaments and then ultimately droplets.

You can use pressure nozzles over a wide flow rate range.

Moreover, it is possible to combine them in multiple nozzle installations giving high particle size flexibility and flow rate.

The scope of operating pressure for this type of spray nozzle varies from 250 PSI to 10,000 PSI.

· Two-Fluid Nozzle

This type of spray nozzle combines compressed air and liquid feedstock in a single nozzle.

It uses compressed air energy for atomization of the liquid suspension.

Two-fluid nozzles can atomize extremely viscous liquids, although they are very costly to run due to high compressed air costs.

Two main benefits of a two-fluid nozzle are the capability to atomize highly viscous fluids and to generate extremely fine particles.

They commonly find application in the pilot plant and laboratory vacuum spray dryer applications.

This is due to their capacity to generate a broad range of droplet sizes and flow rates.

Which are the Advantages of Rotary Atomizer of Vacuum Spray Dryer?

The three main advantages of using a rotary atomizer in vacuum spray dryer include:

  • The feed system can function at comparatively low pressure since the motor-driven wheel supplies the break-up energy.
  • Capable of handling vacuum spray drying in which clogging would present a challenge to the spray nozzles.
  • You can change the particle size by adjusting the speed of the wheel.

Why is it Important to Concentrate the Feedstock Before Introducing into Vacuum Spray Dryer?

Before introducing the feedstock into the vacuum spray dryer, you must concentrate it.

The concentration of feedstock helps in increasing the solid content.

This in turn reduces the quantity of liquid that the vacuum spray dryer must evaporate.

Which are the Different forms of Feedstock for Vacuum Spray Dryer?

One advantage of vacuum spray dryer is that it is possible to introduce any form of feedstock that you can pump:

  • Solutions
  • Slurries
  • Pastes Gels
  • Suspensions

Which are the Key Characteristics of Feedstock that you Must Consider when Using Vacuum Spray dryer?

The initial step in vacuum spray dryer is preparing the feedstock by optimizing its important characteristics:

· Feed Temperature

The feedstock temperature influences the viscosity and heat transfer from the heated air within the drying chamber to the fluid droplets.

Therefore, you must consider both the feedstock and chamber air temperature when choosing materials for the nozzle seal.

· Melting Temperature

Some type of feedstock for vacuum spray dryer is solid at room temperature.

Therefore, you need to melt it to facilitate atomization.

Spray cooling entails producing crystals/pellets through spraying molten feedstock within a dryer chamber having movement of cooling air.

· Abrasion

You must also consider the feedstock abrasiveness when choosing the materials for the interior components of the spray nozzle.

For most applications of vacuum spray dryers, tungsten carbide is the ideal material for orifice disks and swirls.

Tungsten carbide exhibits excellent abrasion resistance and good resistance to corrosion for most feedstock.

· Corrosion

Corrosive attack on the components of the vacuum spray dryer nozzle by some feedstock is a bigger issue than abrasion.

In such situations, you can use spray nozzles made using nickel alloy C22 or 316 stainless steel.

· Specific Gravity

This refers to feedstock density with respect to water.

A value higher than 1 implies that the raw material has a greater density compared to water.

Raising specific gravity of feedstock decreases the feed flow via the spray nozzle.

· Solids Content

Solid content represents the feedstock percentage that comprises of solids.

Majority of feedstock constitutes approximately 50 percent solids, however, the range varies from 20 to 70 percent.

Raising the solid content decreases the moisture quantity removed by the vacuum spray dryer.

As you increase the solid content, the pumping and atomization of feed gets more challenging.

· Surface Tension

This refers to the force exerted on the surface of fluid formulation that have the tendency of decreasing its surface area.

Decreasing the surface tension facilitates easier atomization of the feedstock.

· Viscosity

Viscosity of feed describes its resistance to flow.

Raising viscosity incline to increase size of the droplet.

Moreover, in some nozzle designs, increasing viscosity also increases the rate of flow.

Why is Bulk Density of Powder Important in Vacuum Spray Dryer?

Bulk density refers the dried powder weight/unit volume and forms a crucial parameter in majority of vacuum spray drying machines.

It dictates the fullness/size of packages and affects costs of handling and shipping.

You must constantly monitor the bulk density of powder during the process of vacuum spray drying.

Which are the Factors Affecting Bulk Density of Vacuum Spray Dryer?

Some of the factors influencing bulk density of powder produced by vacuum spray dryer include:

  • The increasing rate of feed raises bulk density when residuary moisture increases
  • When the increasing the temperature of feedstock results in spherical droplets production rather than threads, there will be an increase in bulk density.
  • In the case of easily atomized feedstock, the increasing temperature might lower bulk density.
  • The fine uniform powder features a higher bulk density compared to coarse uniform powder.
  • Powder having broad particle size distribution will feature higher bulk density compared to a powder having narrower sizes distribution.
  • Increasing solids in feedstock typically raise bulk density.
  • Aerating the feed of lowers the bulk density of powder.
  • Liquid suspensions provide higher bulk densities in comparison to liquid solutions.
  • Raising residuary moisture content raises bulk density.
  • Elevating the temperature of inlet air lowers powder bulk density.
  • The decreasing the temperature of outlet air raises residuary moisture level and hence increases powder bulk density.
  • Co-current vacuum spray drying machines generate powders having reduced bulk densities in comparison to counter-current types.

What is the Difference Between Products Produced in Vacuum Spray Dryer and Conventional Spray Dryer?

Let’s look at the key differences between products dried by conventional spray dryer and vacuum spray dryer:

vacuum spray dryer

Laboratory vacuum spray dryer

· Moisture Content

The powder produced by the two spray dryer types exhibited considerable differences between them in terms of moisture.

Vacuum spray dryer produces particles with relatively higher moisture content than conventional spray dryer.

This is due to the high temperature of drying air in a standard spray drying machine.

Due to this fact, there is a larger difference in temperature between the drying air and sprayed product.

The great temperature differential leads to greater transfer of heat and a higher water evaporation.

As a result, it results in lower moisture content values.

Lack of a direct source of heat in vacuum spray dryer leads to high moisture content of the final dried powder.

Absence of sufficient heat to facilitate of entire water out of the product causes the higher moisture content.

· Apparent Density

Particles produced by vacuum spray dryer exhibited the lowest apparent density.

Particle size may be the reason for densities differences between particles produced by vacuum spray dryers and conventional spray dryers.

Smaller powder particles lead to higher apparent density.

This is because the agitation during spray drying tends to reduce the gap between particles.

This compels the powder to cover smaller volumes.

Moreover, you can as well link greater apparent density to reduced moisture content.

Since vacuum sprat dryer form particles with high moisture content, it leads to mot completely dried agglomerates.

As a result, it produces particles with lower apparent density.

However, conventional spray dryer forms powder having greater apparent density.

· Particle Size

The dried product produced by the two spray drying equipment differs considerably from one another in terms of mean diameter.

Particles produced by vacuum spray dryers have a larger diameter compared to those produced by an ordinary spray dryer.

The high temperatures of drying in conventional spray dryer led to smaller particles compared to those formed in vacuum spray dryer.

This could be due to higher evaporation of water in the products, leading to drier and finer particles.

However, in a vacuum spray dryer, the feedstock within the low-pressure drying chamber experiences reduced expansion due to low temperature.

This resulted in the production of larger particles.

Furthermore, the presence of higher moisture content as well leads to increase in particle diameter.

Particles with higher moisture content incline to agglomerate.

The atomizer type, solution viscosity, and feed solution viscosity as well as affect the particle size.

Atomized particle size depends directly on the solution viscosity during an atomization process at a consistent speed.

Solutions of higher viscosity lead to the formation of higher droplets during atomization of the vacuum spray dryer.

Consequently, this results in a greater amount and size of particles.

· Drying Process Yield

There exist a considerable difference in drying efficiency between the two spray drying machines.

Conventional spray dryer exhibit higher yield than vacuum spray dryer because of large material retention in the internal walls of the latter.

Application of high temperatures in traditional spray dryer leads to greater process yield.

You can attribute this to enhanced heat efficiency and mass transfer operations when you elevate the drying air temperature.

In a vacuum spray dryer, the material adhesion onto the drying chamber’s internal walls adversely affects process yield.

The feedstock material deposition is because of partial evaporation of moisture.

To boost process yield, you can install a heat supply system on the chamber’s inner walls.

For instance, you can integrate hot water flow within a jacket.

Moreover, boost water vapor suction movement by incorporating more vacuum pumps in the spray drying system.

What is the Shape of Powder produced by Vacuum Spray Dryer?

Most vacuum spray drying machines generate spherical particles though there are others that produce a non-spherical powder.

Moreover, the particles may be solid or hollow.

You characterize non-spherical particles by their aspect ratio, which refers to the longest dimension to the shortest dimension ratio.

How Does Viscosity Affect the Droplet Size and Flow Rate in Vacuum Spray Dryer?

As earlier explained, viscosity refers to the resistance to fluids flow, whose common measurement unit is the centipoise.

In most cases, an increase in viscosity tends to enlarge droplet size.

Furthermore, with spray nozzle designs, there tends to be an increased flow rate with increased viscosity.

What are the Factors to Consider When Selecting Vacuum Spray Dryer Nozzle?

Here are the essential considerations when choosing the spray nozzle of a vacuum spray dryer:

Spray dryer machine

 Spray dryer machine

  • Feedstock particle size, solid content, viscosity, and density
  • Vacuum spray dryer size, temperature, velocity, humidity and pressure
  • Required construction materials for corrosive environments
  • Required flow rate of spray media
  • Available pressure drop across the spray nozzle

Is there a Difference Between Droplets and Particle in Vacuum Spray Dryer?

Yes, there is significant difference between droplet and particle of vacuum spray drying equipment:

Droplet refers to a subdivision of the feedstock the dryer is spraying from the atomizer. Provided the spray comprises of surface moisture, you refer to it as droplets.

Particle refers to a subdivision of the final dried powder. The particle shape relies on how the vacuum spray dryer formed the droplets and its behavior during spray drying.

Depending on your unique requirements and specifications, we have a range of spray drying machines such as low-temperature spray dryers, benchtop spry dryer, ceramic spray dryer, pilot scale spray dryer, Nano spray dryer, organic solvent spray dryer, inert loop spray dryer, and small spray dryer.

Contact us now for all your vacuum spray dryer needs.


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