organic solvent dehydration
Core Technology
Core Technology
Screening principle
Pervaporation membranes are divided into pervaporation organic membranes and pervaporation inorganic membranes according to materials. The pervaporation inorganic membrane uses molecular sieve as the membrane material (core separation membrane layer), and uses its regular pores to realize the separation of molecular sizes between different components. The A- type molecular sieve pervaporation inorganic membrane forms a tightly packed membrane layer through the growth of A- type molecular sieve crystals on a tubular ceramic porous support. The pore size is about 4.1A, which is larger than the kinetic diameter of water molecules (~ 2.9A) and smaller than the molecular diameter of most organic solvents, on the other hand, the silicon-aluminum content (Si/Al = 1) in the molecular sieve framework makes it extremely hydrophilic, making the molecular sieve pervaporation inorganic membrane particularly suitable for organic solvent dehydration.
principle of clean water
In the process of pervaporation inorganic membrane dehydration, the water-containing mixed organic solvent enters the feed side of the membrane module after preheating, and the permeation side uses vacuum to maintain a low pressure environment (absolute pressure within 2000pa). On the feed side, water molecules are preferentially adsorbed on the surface of the membrane, driven by the partial pressure difference of water vapor on both sides of the membrane, and gasified into water vapor on the permeation side of the membrane. After the separation operation, the water-free organic solvent product is obtained at the outlet of the feed side of the membrane, and the components on the permeate side are condensed and then treated with waste water.
Process advantages
Process advantage
The molecular sieve inorganic membrane permeation gasification and dehydration separation process mainly includes raw material evaporator, preheater, gas-liquid separator, membrane module (including supplementary heat), vacuum condensation (suction filtration) system, product condenser and other operating units. The downstream side of the membrane uses vacuum and condensation to recover the condensed permeate (mainly water), and the finished product is gradually dehydrated through the membrane modules in series until the anhydrous organic solvent required by the customer.
Application areas
Application field
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