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This category of chemicals covers wide range of organic and inorganic chemicals. The manufacturing process for production in solid form requires an evaporation and drying operation. The type of system required depends on the physical properties of the wet cake and the final desired physical properties, size and shape. Practically all types of dryers have been used to process materials falling in this category. Some of the typical usages are given below: |
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| Inorganic Sales |
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| There is wide variety of inorganic salts which require evaporation and drying as an operational step in manufacture. Some of the examples are Sodium Sulfate can either be directly spray dried to get anhydrous sodium sulfate or could be crystallized out after evaporation and then dried in either a Flash Dryer or Fluid Bed Dryer for hydrated sulfates. Spray Dryers are used for drying the magnesium sulfate slurry. Dicalcium Phosphate is dried in a Flash Dryer or Agitated Flash Dryers. Di calcium phosphate is used for industrial or pharmaceutical duties. The dryer design depends on the end use of Di-calcium phosphate. |
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| Pharmaceutical & Fine Chemicals |
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| Normally these are processed in batch type of a dryer. Either a Fluid Bed Dryer or Vacuum Dryer is used. |
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| Polymer Granules & Powder |
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These are dried in either batch / continuous Fluid Bed Dryer or Flash Dryers. Some of the polymeric material may have solvent present in the solids, which may require special designs for safety. For some grades of polymer Spray Drying are also used.
Spray Drying plants with special air brooms or wall cooling arrangements are used for drying formaldehyde or other polymeric emulsions. Flash Drying plants with extensive safety and control arrangements are used for drying Polystyrene Beads while Acrylics Resins are dried in Fluid Bed Dryer. |
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| Lignosulphonates |
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| These are normally dried in spray drying plants. The ligno-sulphate solution is spray dried using rotary atomizer Spray Dryers. |
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