化工学报2023，Vol.74Issue(10)：4182-4190,9.DOI:10.11949/0438-1157.20230820
螺旋微通道反应器贝克曼重排制备己内酰胺
Preparation of caprolactam by Beckmann rearrangement in spiral microchannel reactor
摘要
Abstract
Caprolactam was prepared by Beckmann rearrangement using a spiral microchannel reactor.Through in-situ solvent vaporization and secondary flow technology,it overcomes the problems of high flow resistance in the microreactor of the high-viscosity reaction system,easy to cause local hot spots,and low production capacity.The effect of reaction temperature,solvent vaporization,helical size,pipe inner diameter,feedstock concentration,and flow rate on the conversion and selectivity of the reaction was investigated.The experimental results showed that the conversion rate could reach 100%and the selectivity was more than 99%with a 2 mm inner diameter spiral pipe,dichloroethane as solvent and an acid-oxime molar ratio at 1.1,a preheating temperature at 80℃,a rearrangement temperature at 90℃,a cyclohexanone oxime solution concentration at 10%—20%(mass),a retention time at 15 s,and a spiral diameter at 20 mm.20.2 g/min capacity for a single tube was realized,which corresponds to 9.7 t/a based on 8000 h per year.The results would provide theoretical guidance in the design and development of high-throughput and high-efficiency microchannel reactors.This study presents a solution for microreactors for highly viscous systems.关键词
贝克曼重排/己内酰胺制备/微反应器/多相反应/界面Key words
Beckman rearrangement/caprolactam preparation/microreactor/multiphase reaction/interface分类
化学化工引用本文复制引用
李晨亚,刘捷,王建芝,刘艳萍,林笑,喻发全..螺旋微通道反应器贝克曼重排制备己内酰胺[J].化工学报,2023,74(10):4182-4190,9.基金项目
国家自然科学基金项目(22078251) （22078251）
武汉工程大学研究生教育创新基金项目(CX2022032) （CX2022032）
