Comprehensive Utilization of Acid-containing DMF Solution

被引：0

作者：

Chen, Jing-Jing ^{[1
,2
]}

Jie, Hui-Min ^{[2
,3
]}

Zheng, Hui-Dong ^{[2
]}

机构：

[1] College of Materials Science and Engineering, Fuzhou University, Fuzhou,Fujian,350108, China

[2] College of Chemical Engineering, Fuzhou University, Fuzhou,Fujian,350108, China

[3] Fuda Huixiang Chemical Technology Co., Ltd, Fuzhou,Fujian,350108, China

来源：

Jingxi Huagong/Fine Chemicals | 2019年 / 36卷 / 12期

关键词：

Distillation - Organic solvents - pH - Acetic acid - Mixtures;

D O I：

10.13550/j.jxhg.20190373

中图分类号：

学科分类号：

摘要：

A novel green process was developed for the recovery of N,N-dimethylformamide (DMF) from the acid-containing DMF solution by adding dimethylamine into the acid-containing DMF system during the primary distillation-continuous reaction-secondary distillation process, with N,N-dimethylacetamide (DMAC) produced as by-product. The laboratory research and the pilot-scale test were carried out. The results show: dimethylamine can break the interaction between DMF and acetic acid; the crude DMF with purity of 95% and no acid was produced during the primary distillation process, and the recovery of DMF was about 80%; the acid reacted with dimethylamine, producing DMF and DMAC, with a conversion of 96%, and the concentration of acid in the mixture was reduced to 1.4% after the reaction; the distillate with 47% DMF and the residue with 97.7% DMAC were obtained from the reaction mixture in the secondary distillation process. © 2019, Editorial Office of FINE CHEMICALS. All right reserved.

引用

页码：2457 / 2461