Chemical name: N-methylpyrrolidone

CAS login number: 872-50-4

Specifications:

Appearance：colorless transparent liquid

Chemical formula：C5H9NO 

Molecular weight：99.13 

Density  g/cm3：1.033 

Melting point  ℃ ：-24 

Boiling point ℃ ：202 

Purity  %：99.91 

Moisture ppm ：88 

Chroma APHA ：6 

Total amine ppm ：12.7 

PH：7.73 

◆Nature:is miscible with water, soluble in most organic solvents such as ether and acetone, and can dissolve most organic and inorganic compounds, polar gases, natural and synthetic polymer compounds
◆Application:excellent advanced solvents, widely used in petrochemical, pesticide, medicine, electronic materials and other fields. It can be used for synthesis gas desulfurization, lubricating oil refining, lubricating oil antifreeze, olefin extractant, agricultural herbicide, insulation material, integrated circuit production, pvc tail gas recovery, cleaning agent, dye additive, dispersant, etc.
◆Storage method:stored in a cool, dry place

　 What is NMP N-methylpyrrolidone

       N-methylpyrrolidone is a kind of organic matter, chemical formula C5H9NO, colorless to light yellow transparent liquid, slightly ammonia odor, miscible with water in any proportion, soluble in ether, acetone and ester, halogenated hydrocarbons, aromatics and other organic solvents, almost completely mixed with all solvents. The foreign name is N-Methylpyrrolidone.

　　NMP is one of the most commonly used accessories for lithium batteries. NMP is the solvent of PVDF binder, is the English abbreviation of N-methylpyrrolidone, a colorless transparent liquid, with low toxicity, high boiling point, strong polarity, low viscosity, strong solubility, chemical stability, excellent thermal stability and other characteristics, can be miscible with water, PVDF, positive and negative electrode materials, etc., widely used in the preparation of lithium batteries. When making electrode sheets, NMP is used as a solvent to fuse various materials required for electrodes, such as binder, positive active substance, conductive agent, etc., so that the binder is fully in contact with other substances and evenly distributed. As a solvent, the quality of NMP directly affects the quality of pulping coating of lithium-ion batteries, which is an indispensable solvent material. From the perspective of the distribution of NMP application fields, it is mainly used in the preparation of lithium batteries, accounting for 74%.

　　Global distribution of NMP applications (unit: %)

　　The use of NMP in other fields (polymers, insulation materials, electronic materials, petrochemicals) is as follows:

　　Polymer industry

　　NMP exists as a para-aramid polycondensation solvent, with an estimated demand of 23,000 tons.

　　Insulation material industry

        NMP is used as a reaction and dilution solvent for polyimide paint in the insulation material industry, and the domestic market is concentrated in East China and central and western China, with a total of 9 companies, and the annual demand for NMP is about 8,000 tons.

        Electronic material industry

        NMP is used in electronic materials for IC, PCB, LED, semiconductor cleaning, mainly ultra-pure electronic chemicals, the current domestic production is less, mostly imported, the annual demand is about 2500 tons.

        Petrochemical industry

        NMP petrochemical for butadiene extraction, isoprene extraction, synthesis gas desulfurization acetylene recovery, lubricating oil refining, the annual demand of 2800 tons.

　　The important role of NMP in the production of lithium batteries

　　The use of NMP in the production of lithium batteries is to dissolve/swell PVDF, and to dilute the slurry at the same time, the concentration is generally required to be above 99.9%. As one of the main auxiliary materials in the manufacturing process of lithium ion battery, NMP directly affects the quality and environmental protection requirements of lithium ion battery pulping coating.

　　NMP is a supporting solvent for lithium battery positive binder PVDF (polyvinylidene fluoride), and is also a necessary supporting solvent for PVDF (polyvinylidene fluoride). NMP can be miscible with water, PVDF, positive and negative electrode materials, so it is widely used in the preparation of lithium batteries. When making electrode sheets, NMP, as a solvent, can fuse the binder, positive active material, conductive agent and other materials required for electrodes together, so that the binder is fully in contact with other substances and evenly distributed.

　　Analysis of economic and environmental benefits of NMP

　　In 2021, benefiting from the rapid development of the new energy vehicle industry, NMP prices have been rising, from 15,000 yuan/ton in early 2021 to more than 40,000 yuan/ton in 2022. At present, 18,000 yuan/ton to 28,000 yuan/ton.

　　In the production process of lithium batteries, NMP is used as an expensive solvent, and high temperature NMP exhaust gas is generated in the coating process. If it is not effectively recycled, it will not only cause waste of raw materials, but also cause serious pollution to the environment. China also has relevant control requirements for NMP emissions, "The base value of exhaust gas pollutant index NMP in the Battery Industry Cleaner Production Evaluation Index System (Trial) is 1.5mg/m3". The "Battery Industry Pollutant Emission Standard" stipulates that the limit value of organized emission concentration of NMP exhaust gas is 50mg/m3. Therefore, strengthening NMP emission control and recycling in the production process of lithium batteries has greater economic and environmental benefits.

　　N-methylpyrrolidone is a dangerous chemical ~~ In transportation is not dangerous goods, is a general cargo, non-dangerous goods, packaging is generally galvanized barrels or polyethylene aluminum barrels, is a polar solvent.

　　N-methylpyrrolidone harm to human body

　　N-methylpyrrolidone is a kind of organic matter, the harm to the human body is usually to stimulate the respiratory tract, but also damage the skin, if the inhalation concentration is relatively high, it will even cause nerve damage, may lead to loss of consciousness or death, there is a certain risk, should be away from or do a good job of protection.

　　1.stimulate the respiratory tract: N-methylpyrrolidone has certain toxicity, after being inhaled into the body often lead to irritation of the nasal mucosa or throat mucosa, cough or sore throat symptoms;

　　2.skin damage: N-methylpyrrolidone long-term contact with the skin, will lead to skin damage, such as skin redness, edema, rash, itching or pain symptoms, mainly because it has a certain irritation, the degree of skin damage and the specific contact concentration has a certain relationship;

　　3.resulting in loss of consciousness or death: high concentration of N-methylpyrrolidone inhalation usually leads to central nervous suppression, prone to nausea and headache symptoms, if the concentration is very high, it will cause loss of consciousness, and even lead to death, the risk is relatively high.

　　In addition, if N-methylpyrrolidone accidentally contacts the eyes, it may lead to acute conjunctivitis, eyelid edema, dry eye itching, tearing, photophobia and other symptoms. Long-term exposure to low concentrations of N-methylpyrrolidone can lead to chronic poisoning, including dizziness, weakness, and impaired liver function. N-methylpyrrolidone also decomposes to produce carbon monoxide and toxic fumes when heated and burned, so daily contact with the substance should be avoided as much as possible, and protective measures should be taken carefully if contact is required for production and use.

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