Organic solvent dehydration equipment
● Screening principle
Permeation gasification membranes are divided into organic membranes and inorganic membranes based on their materials. The pervaporation inorganic membrane uses molecular sieves as the membrane material (core separation membrane layer), and uses its regular pores to achieve the separation of molecular sizes between different components. A-type molecular sieve pervaporation inorganic membrane is a tightly packed membrane layer formed by the growth of A-type molecular sieve crystals on a tubular ceramic porous support, with a pore size of about 4.1A, which is larger than the dynamic diameter of water molecules (~2.9A) and smaller than the molecular diameter of most organic solvents, Exhibiting good shape selectivity for water molecules; On the other hand, the silicon aluminum content (Si/Al=1) in the molecular sieve skeleton makes it highly hydrophilic, making A molecular sieve permeable gasification inorganic membrane particularly suitable for organic solvent dehydration.
● Principle of hydrophilicity
In the process of osmotic gasification inorganic membrane dehydration, the aqueous mixed organic solvent is preheated and enters the feed side of the membrane component, while the permeate side is maintained in a low-pressure environment (with an absolute pressure of less than 2000pa) by vacuum pumping. On the feed side, water molecules preferentially adsorb on the membrane surface, penetrate the membrane under the pressure difference of water vapor on both sides of the membrane, and gasify into water vapor on the permeation side of the membrane. After the separation operation, anhydrous organic solvent products are obtained from the outlet of the membrane feed side, while the permeate side components are condensed and treated with wastewater.
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