How to measure N-methylpyrrolidone concentration?

NMP is a polar aprotic solvent. It has the advantages of low toxicity, high boiling point, outstanding solubility, strong selectivity and good stability.

NMP  is widely used in the extraction of aromatic hydrocarbons, purification of acetylene, olefins, and dienes, solvents for polyvinylidene fluoride, electrode auxiliary materials for lithium-ion batteries, syngas desulfurization, lubricant oil refining, lubricant antifreeze, olefin extraction agents, and difficult-to-use solvents. Solvents used in the polymerization of engineering plastics, agricultural herbicides, insulation materials, integrated circuit production, cleaning of precision instruments and circuit boards in the semiconductor industry, PVC exhaust gas recovery, cleaning agents, dye additives, dispersants, etc.

It is also used as a solvent for polymers and a medium for polymerization reactions, such as engineering plastics and aramid fibers. NMP can also be used in pesticides, medicines and detergents.

The online concentration meter uses the principle of refraction to measure the refractive index of the solution, and the refractive index has an excellent correspondence with the concentration of N-methylpyrrolidone solution. Finally, the actual concentration of the solution can be obtained through conversion. The online concentration meter is a precision instrument with a compact structure, simple and convenient operation, and can monitor the solution concentration online in real time 24 hours a day.