Micro Mist Spray Dryer
Four-fluid nozzle Micro Mist Spray Dryer (MMSD)
Micro Mist Spray Dryer
Single micron range has been achieved since it was not possible in conventional spray dryer.
Particle size distribution



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Micro Mist Spray Dryer | Spray dryer |
Atomization Methods |
Four-fluid nozzle | Two-fluid nozzle Rotary atomizer *Need high speed rotation, and there is not past results. |
Atomizing Small Amount |
One nozzle | One nozzle |
Atomizing in High-volume Fine Powder Production |
One nozzle | Multiple nozzles |
Scale up |
Easy to scale up using parameter test by a laboratory unit. | There are some problems such as gas-flow turbulence and droplet collision with multiple nozzles, so consideration should be made in many aspects. |
Drying Efficiency |
Drying efficiency is high due to 180° hollow cone and there is no unevenness in hot air contact. | Drying efficiency is not good due to full cone that has forwardness and takes a lot of time to contact the hot air. |
System Size |
Drying chamber is smaller since the drying efficiency is high compared to the general spray drying. | Drying chamber will be bigger. |
Continuous Operation |
Long time operation without nozzle clogging | Likely to cloggy the inside of nozzles. |
Compressed Air Volume |
In the case that the liquid processing rate is same, the air flow rate is less than the total of multiple nozzle. | Large |
Operating Performance |
Easy to control with a touch panel. | Complex due to control many nozzles and liquid sending pumps. |
Maintenance |
Easy to maintain. | Hard to maintain due to many nozzles and pumps. |
Initial Cost |
Make the size smaller, can suppress a cost. | In the case of scale-up, likely to increase in cost. |
Running Cost |
Electrical energy consumption of compressor will be 20% to 50% less. | Electrical energy of compressor is huge. |
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Micro Mist Spray Dryer | Other method |
Few Microns Fine Powder Manufacturing Process |
Powder can be attained directly from the liquid. | In the case of slurry, condensation will be necessary if the solution is a type that attains powder by disintegrating/pulverizing the liquid after dehydrating at the filter press and drying by shelf drying. |
System Configuration |
1 unit | Several units |
Research Development |
Powder can be attained easily. | Takes time |
Operating System |
Long time continuous operation. | Batch operation |
Closed Loop |
Possible | Difficult |
Classifying Operation |
Not necessary | Sometimes necessary |
Productivity |
Operating time is short for production amount and high productivity can be attained if the liquid concentration rises. Have great collection efficiency. | In case of long operating time. Low collection rate because of the adherence and flying apart at each device. |
Operating Performance |
Simple | Operating knowledge is necessary for each device and washing and assembling is complex and difficult. |
Maintainability |
Simple Nozzle is the only spare parts item that is necessary. |
Maintenance knowledge and spare parts item is necessary for each device. |
Sanitary Property |
High | Low |
Initial Cost |
Comparing the total cost, it is about the same, or even cheaper. | It can be either expensive or cheap depending on the device selection & combinatio? and system integration complexity. |
Running Cost |
Manpower is not needed much, electrical energy of compressor is big. | Manpower can be needed much depending on the material flow between devices. |
Contamination |
Never | High chance of contamination |
Fluid Property |
Possible on both solution and slurry. Slurry initial particles better to be below 1 to 2 µm. |
Difficult in solution, and increasing concentration will be necessary. |
Product Property |
Spherical form Porous, low density |
Formation is instable. High density |
Quality control of the product |
Easy to control since the factor is less. | Quality control is necessary on each device and the factor will be a lot. |
Residual moisture of the product |
Almost every powders can observe the standard. | Sometimes final drying might be necessary. |
Thermal denatured |
Instant drying at low temperature below boiling point is possible. | Exposure time at drying heat temperature is long. |