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  Spray Dryer

  Spray Dryer

  
  

  Spray drying is a one-step continuous unit operation that employs liquid atomization to produce droplets that are dried to individual particles when moved in a hot gaseous drying medium. A spray dryer consists of a feed pump, atomizer, air heater, air dispenser, drying chamber, and systems for exhaust air cleaning and powder recovery/separator.

  The three stages that occur in a spray dryer before drying is accomplished include:

  1. Atomization

  2. Spray-air mixing and moisture evaporation.

  3. Dry product separation from the exit air.

  
  

Features:

1. The drying speed is fast, generally only 5-15 seconds, and it has the characteristics of instant drying;

2. The drying process of the material is completed in a short time, which is suitable for drying heat-sensitive materials, and can maintain the color, aroma and taste of the material, and the finished product has high purity and good quality;

3. The production process is simplified, the operation control is convenient, and it is suitable for continuous production control; the liquid with a moisture content of 40%-90% can be dried into powder at one time, and the processes such as crushing and screening are reduced.

4. The product has good dispersibility, fluidity and solubility, and the particle size, bulk density and water content of the product can be adjusted within a certain range.

Working principle

The air passes through the filter and heater, and enters the air distributor at the top of the dryer, and the hot air enters the dryer evenly in a spiral shape. The feed liquid is pumped from the feed liquid tank through the filter to the centrifugal atomizer of the dryer, so that the feed liquid is sprayed into extremely small mist droplets. It can be dried to powdery product within time. The finished product is discharged from the bottom of the drying tower and the cyclone separator, and the waste gas is discharged by the fan.

Spray dryer process layout

SCOPE OF APPLICATION 

Pharmaceutical uses of Spray dryer

1. Spray dryer is used in drying pharmaceuticals like penicillin, blood products, enzymes, vaccines, etc.

2. It is used in the production of excipients and co-processed excipients with increased flowability, compatibility, and tablet disintegration.

3. To improve drug compressibility and reduce capping tendencies in crystals.

4. It is equally used in the preparation of matrix microcapsule containing drug substances and a biodegradable polymer in order to obtain controlled drug release formulation.

5. It is employed in enhancing solubility and dissolution rates of poorly soluble drugs by formation of pharmaceutical complexes or via the development of solid dispersion thus increasing bioavailability.

6. It is used in the production of dry powder formulation/dry powder aerosol and thermoabile materials.

Apart from its applications in the pharmaceutical industries, spray dryers also find use in

Chemical industries e.g. phenol-formaldehyde resin, catalysts, PVC emulsion type, amino acids etc.

Ceramic industries e.g. aluminum oxide, carbides, iron oxides, kaolin, etc.

Dyestuffs and pigments e.g. chrome yellow, food color, titanium dioxide, paint pigments, etc.

Fertilizer production e.g. nitrates, ammonium salts, phosphates, etc.

Detergent and surface-active agents e.g. detergent enzymes, bleach powders, emulsifying agents etc.

Food industries e.g. milk, whey, egg, soya protein, etc.

Fruits and vegetables e.g. banana, tomatoes, coconut milk, etc.

Beverage e.g. coffee, tea, etc.

Technical parameter

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