Reliable quality of global trader N-Methyl-2-pyrrolidone(NMP) on hot selling CAS NO.872-50-4

reliable quality of global trader n-methyl-2-pyrrolidone(nmp) on hot selling

production method
it is obtained by the reaction of γ-butane ester with methylamine. the first step in the reaction is to γ-butane ester and methylbutylamine to produce 4-hydroxy-n-methylbutylamide, and the second step is to dehydrate to produce n-methylatonin. the two-step reaction can be carried out continuously in a tube reactor, with a molar ratio of γ-butane to methylamine of 1:1.15, a pressure of about 6mpa and a temperature of 250 degrees c. after the reaction is completed, the finished product is distilled by concentration and decompression. the yield is 90%. if the use of kettle-type anti-inverter production, the amount of methamine is 1.5-2.5 times the theoretical amount, to take laboratory preparation as an example. in a 500 ml heat press, add 2 mol-butane ester and 4 moles of liquid methamine, closed heating, and keep warm at 280 degrees c 4h. after cooling, release excess methylamine, distillation, collection of 201-202 degrees c fractions, about 180g of the product, the yield of about 90%. raw material consumption (kg/g) γ-butane 980 methamine (40%)860