Recovery and reprocessing of NMP in lithium electronic battery industry

N-methyl-pyrrolidone, Chinese alias: NMP; 1-methyl-2-pyrrolidone; N-methyl-2-pyrrolidone. Colorless and transparent oily liquid with slight smell of amine. Low volatility, good thermal and chemical stability, can volatilize with water vapor. Hygroscopic. Sensitive to light. Soluble in water, ethanol, ether, acetone, ethyl acetate, chloroform and benzene, it can dissolve most organic and inorganic compounds, polar gases, natural and synthetic polymer compounds. N-methylpyrrolidone is widely used in lithium battery, medicine, pesticide, pigment, cleaning agent, insulating material and other industries.

High precision electronics, circuit board, lithium battery, etc., cleaning agent: high-grade coating, ink and pigment, such as degreasing, degreasing, dewaxing, polishing, antirust, depainting, etc., have the advantages of low toxicity, high boiling point, strong dissolving power, nonflammability, biodegradation, recyclable, safe use and applicable to a variety of formula uses.

NMP is a highly efficient and selective solvent, non-toxic, high boiling point, small corrosiveness, high solubility, low viscosity, low volatility, good stability, easy recovery and other advantages. The main uses of NMP in the electronic industry are as follows:

(1) NMP is used as solvent of PVDF and electrode auxiliary material of Li-ion battery.

(2) it can be used for photoresist remover and LCD material production;

(3) solvents used in pharmaceutical production;

(4) cleaning of precision instruments and circuit boards in semiconductor industry.

The waste methyl pyrrolidone used in the lithium electronic battery industry can be recycled through the Calstar solvent recovery machine and vacuum decompression system. Because of its high boiling point, the direct recovery method can not be used. By vacuum decompression, the recovery heating temperature can be reduced, the recovery quality can be guaranteed, and the recovery safety factor can be improved.