Background
　　
　Pervaporation technology is essential for anhydrous organic solvents in the fields of petrochemicals, fine chemicals, pharmaceutical chemicals, electronics, and new energy. Therefore, removing small or trace amounts of water from organic solvents to obtain anhydrous organic solvents is one of the most important and common unit processes in these fields. Traditional organic solvent dehydration methods such as distillation or adsorption have problems such as high energy consumption, complex operating processes, and secondary pollution.
　　
　　Pervaporation is a new type of membrane separation technology, and molecular sieve pervaporation membranes utilize the dual mechanisms of membrane layer adsorption diffusion of components and molecular sieving. When organic solvents are used for dehydration and separation, hydrophilic membranes are used as membrane materials to allow a small amount of water to pass through first to remove water. The application scope of pervaporation membrane technology covers fields such as alcohols, ethers, esters, amines, acids, etc. The NaA type molecular sieve membrane has been widely applied in the dehydration treatment of organic solvents such as ethanol, acetonitrile, isopropanol, tetrahydrofuran, etc. Its high efficiency, energy saving, and high recovery rate demonstrate excellent separation and dehydration performance.
　　
Advantages and characteristics of pervaporation membranes
　　
　　★ Recovery rate up to 99%：By using the pervaporation dehydration process alone, the recovery rate can reach over 97%. If combined with distillation, the recovery rate can reach over 99%；
　　
　　★ Energy saving of over 75%：The energy-saving and high-efficiency characteristics of the pervaporation membrane separation device are determined by technical principles, and the required energy consumption is only 20%~25% of that of azeotropic distillation and adsorption；
　　
　　★ Zero emission of pollutants：Through the recycling and reuse of materials, zero emissions of pollutants can be achieved, and the target treatment objects can be fully utilized; Especially suitable for handling highly toxic and high value-added organic solvent recovery systems；
　　
　　★ High product purity：The separation process does not require the addition of any extractants or other substances to ensure the purity of the product, making it more suitable for the solvent requirements of the pharmaceutical and chemical industry；
　　
　　★ Save over 80% of space：Compared with distillation separation equipment, it can save more than 80% of space. Compared with organic membrane pervaporation, it does not require a vacuum hood, saving space and facilitating maintenance；
　　
　　★ Long service life and high separation coefficient：Compared with pervaporation organic membranes, they have the characteristics of high flux, high separation coefficient, no swelling, strong solvent resistance, corrosion resistance, and long membrane life；
　　
　　★ Fully automatic production, stable quality：After normal operation of the equipment, there is no need for excessive adjustment and automatic instrument monitoring, achieving fully automated operation。