Moisture can be removed from organic liquids by adsorption technique at a lower capital as well as operating cost. By this process product moisture lower than 5 ppm can be achieved
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Mainly water – insoluble organic liquids and liquified gases are dried.
- Paraffins : Propane, Butane, Pentane, Hexane
- Olefins : Propane, Butane,
- Aromatics : Benzene, Toluene, Xylene
- Hydrocarbon : Dichloromethane, Dichloroethane, Trichloroethylene.
- Cooling Agents : Chlorodifluoro methane, Dichloro difluoro methane
Organic liquids which are partially or completely soluble in water :
- Alcohols : Methanol, Ethanol
- Esters : Ethyl acetate, Propyl acetate
- Ketones : Acetone, Methylethyl ketone.
For batch process sometimes one adsorber can be used. However for continuous operation, two adsorbers are required, where one is kept under adsorption and the other is used for reactivation. Residence time and cycle are relatively high for liquid dryers. Normally, liquid dryers are operated in manual mode as automatic plants are capital intensive.
Due care is to be taken during regeneration in a liquid dryer. Normally regeneration is done in a closed loop either by vaporizing the product or by using Nitrogen gas. The regeneration gas is heated by means of a heater and passed through the adsorber under regeneration. The moisture picked up from the adsorber is condensed in a cooler and separated in a moisture separator.
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