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N-Methylpyrrolidone (NMP) is the lactam of 4-methylaminobutyric acid and a very weak base. NMP is a chemically stable and powerful polar solvent. These characteristics are highly useful in a variety of chemical reactions where an inert medium is of concern. Despite the stability of NMP, it can also play an active role in certain reactions: hydrolysis, oxidation, condensation, conversion with chlorinating agents, polymerization and o-alkylation, and related reactions.

Applications
 
Recovery of Pure Hydrocarbons in Petrochemical Processing
A well-established application for NMP is the large-scale recovery of hydrocarbons by extractive distillation. This technique utilizes the high solubility of hydrocarbons in NMP and the fact that differences in volatility are sometimes considerably increased in the presence of NMP. Compared to other commercial solvents and extraction media, NMP offers the following advantages: no azeotropes are formed with hydrocarbons; NMP is very resistant to heat and chemicals; and NMP has a favorable toxicological and environmental profile.
 
Desulfurization of Gases
High concentrations of acidic compounds are often present in natural or synthesis gases. Examples are hydrogen sulfide, carbon oxysulfide, carbon dioxide and organic sulfur compounds. Rather than applying a chemical process, they are removed by physical scrubbing in several stages with a mixture of NMP, alcohol and water.
 
Plastics
NMP is a widely used industrial solvent for natural and synthesis plastics, waxes, resins and various types of paints. It dissolves polymers, such as cellulose derivatives, polyamides, polyimides, polyesters, polystyrene, polyacrylonitrile, polyvinyl chloride, polyvinyl pyrrolidone, polyvinyl acetate, polyurethanes, polycarbonates, polyethersulfones, polysulfones, polyethers and many copolymers.
 
Surface Coatings
NMP is a non-corrosive high boiler with excellent solvent power and chemical resistance. Thus, NMP improves the properties of many surface coating systems. In particular, these effects are favorable for baked coatings that are cured at relatively high temperatures. NMP allows the production of highly filled paints and finishes. Since it improves the rheological properties, paints with superior flow-out and covering power are obtained. Hence, the coatings are more homogeneous, non-porous and non-cratering, and they display greater resistance to chemicals and higher mechanical strength.
 
Paint Stripping and Cleaning
Due to its high solvating power for plastics, resins, oil and grease, NMP has been successfully employed as an ingredient in paint removers, cleaners and degreasers. NMP can be used alone or in blends for removal of oil, carbon deposits and other tarry polymeric residues from metal chambers, pistons and cylinders, as well as for wet cleaning of combustion engines.
 
Plant Protection
NMP can be used as a solvent or co-solvent for the formulation of insecticides, fungicides, herbicides, seed treatment products and bioregulators where highly polar compounds are required. NMP is given preference over other highly polar solvents because it is exempt from the requirement of a tolerance when used as a solvent or co-solvent in pesticide formulations applied to growing crops, and it possesses a favorable toxicological and environmental profile.
 
Electronic Equipment Manufacture
The production of integrated circuits (ICs) calls for products of very high purity. The Electronic Grade NMP exceeds in all points the standard established by SEMI (Semiconductor Equipment and Materials Institute). This makes NMP a desired solvent for the electronic industry and producers of printed circuit boards. Blends of NMP with common solvents are utilized for the cleaning and degreasing of single-crystal silicon wafers for ICs.

For further information on NMP N-Methylpyrrolidone, refer to the Technical Data Sheet, NMP Physical Properties Page or contact the appropriate regional Diols customer representative on the Customer Service Page.
 
     
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