微通道反应器中催化裂解合成N，N-二甲基丙烯酰胺新工艺研究

Study on the Novel Process for Preparation of N,N-Dimethylacrylamide by Catalytic Pyrolysis in a Microreactor

N,N-二甲基丙烯酰胺(DMAA)是一种具有广泛开发应用前景的精细化工原料,在石油开采、纤维塑料改性、精细化工、生命科学等领域有广阔应用前景。研究了微通道反应器中以3-(N,N-二甲氨基)-N,N-二甲基丙酰胺(DMDA)为原料、四丁基溴化铵(TBAB)为催化剂合成DMAA的催化裂解新工艺。考察了催化剂用量、体积流速、反应温度对DMDA单程转化率的影响。优化选择了较优工艺参数组合:催化剂用量m(TBAB):m(DMDA)为0.02,体积流速0.24mL·min-1,反应温度270℃,DMDA单程转化率达17.0%,时空转化率(STC)达2.36×109mol·m-3·h-1。微通道反应器中时空收率是常规反应器的1500倍。

N,N-dimethylpropanamide （DMAA） is a raw material of fine chemical industry, which has a bright developing and using future. Nowadays the DMAA is used in many fields, such as in petroleum recovery, modification of fiber and plastics, fine chemical industry, science of life, etc.. In a microchannel reactor, the DMAA was synthesized with 3-（dimethylamino）-N,N-dimethyl-propanamide （DMDA） as raw material and tetrabutyl ammonium bromide （TBAB） as catalyst. The effects of catalyst dosage, current capacity and reaction temperature on the single-pass conversion ratio were evaluated and the suitable operation parameters were selected. They are the reaction temperature of 270℃, the current capacity of 0.24 mL·min^-1 and the mass ratio of catalyst to DMDA equal to 0.02. Under the selected conditions, the single-pass conversion ratio of DMDA can reach 17.0% by using the microchennal reactor, and the space-time conversion rate （STC） is about 1500 times of that obtained by using conventional reactor.