What methods are used for solvent dehydration, such as for dichloroethane?
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What methods are used for solvent dehydration, such as for dichloroethane?
1. Azeotropic dehydration. 2. Adsorption dehydration: Dehydration is achieved using calcium chloride, soda ash, Glauber’s salt, molecular sieves, salts, and phosphorus pentoxide. Among them, molecular sieves and phosphorus pentoxide can be easily reduced to below 500 ppm
For large processing volumes, use distillation and molecular sieves for deep dehydration
Industrial-grade dichloroethane can first be subjected to extraction; after stratification, the water layer is removed, and then it is dried and dehydrated using an anhydrous calcium chloride packed column. Multiple stages of desorption are employed, which can achieve a level of impurities around 200PPM
At the first stage, salt can be used; at the second stage, calcium chloride can be used, in block form. However, block-shaped calcium chloride is rarely available these days. After drying, a filter should be added
After free water is removed by decantation in aqueous dichloroethane, the dissolved water (about 2000–3000 ug/g at room temperature) is typically removed using azeotropic distillation, so that the water content drops to below 20 ug/g.
Water is removed using azeotropic distillation
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Large processing capacity, using heterogeneous azeotropic distillation； The processing volume is small; dehydration is achieved using molecular sieves and coagulators.