Study on Extraction Separation of N，N-Dimethylformamide with Chloroform

doi:10.19894/j.issn.1000-0518.220302

Chinese Journal of Applied Chemistry ›› 2023, Vol. 40 ›› Issue (4): 554-561.DOI: 10.19894/j.issn.1000-0518.220302

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Study on Extraction Separation of N，N-Dimethylformamide with Chloroform

Fei-Yue CHEN¹^,², Zhen-Ning SU², Quan-Zhong CHENG², Bo-Ren TAN², Zhi-Yong LI³, Xiao-Hua YU¹(), Yong WANG²()

^1.Faculty of Metallurgical and Energy Engineering，Kunming University of Science and Technology，Kunming 650093，China
^2.CAS Key Laboratory of Green Process and Engineering，Institute of Process Engineering，Chinese Academy of Sciences，Beijing 100190，China
^3.the Fourth Construction Co. Ltd. of China Electronics System Engineering，Shijiazhuang 050051，China

Received:2022-09-08 Accepted:2023-02-07 Published:2023-04-01 Online:2023-04-17
Contact: Xiao-Hua YU,Yong WANG
About author:wangyong@ipe.ac.cn
85208478@qq.com
Supported by:
the National Natural Science Foundation of China(22178350);the National Key R&D Program of China(2019YFC1907700);Yunnan Ten Thousand Talents Plan Young & Elite Talents Project(YNWR-QNBJ-2018-327)

Abstract

Abstract:

The separation and recovery of N，N-dimethylformamide （DMF） from the liquid containing high mass fraction of DMF is studied by continuous extraction in a pulsed disc and doughnut extraction column （PDDC）， which combines with a distillation process. For the feed liquid with 38.46% DMF， chloroform is used as the extraction agent and DMF is extracted in a PDDC. The effects of the extraction operation parameters such as oil-water ratio， flow rate and pulse conditions on the DMF extraction are studied. The results show that the extraction efficiency of DMF increases with the addition of pulsation， the increase of oil-water ratio and the increase of two phase flow rate. Under the optimized conditions， the highest extraction ratio of DMF ias 99.94%， and the DMF mass fraction in raffinate is less than 0.5%. Furthermore， batch distillation experiments and simulation calculations are carried out for the separation of chloroform solution loaded with DMF. The results show that effective separation and recovery of chloroform and DMF can be achieved through continuous distillation.

Key words: N, N-Dimethylformamide, Chloroform, Disc and doughnut extraction column, Distillation

CLC Number:

O658.2

Fei-Yue CHEN, Zhen-Ning SU, Quan-Zhong CHENG, Bo-Ren TAN, Zhi-Yong LI, Xiao-Hua YU, Yong WANG. Study on Extraction Separation of N，N-Dimethylformamide with Chloroform[J]. Chinese Journal of Applied Chemistry, 2023, 40(4): 554-561.

Figures/Tables 9

Fig.1 Schematic diagram of experimental system of the pulsed disc and doughnut columnNote： 1.Active segment； 2.Settler segment； 3.Magnetic drive pump； 4.Rotameter； 5.Electric motor； 6.Cylinder

Table 1 Physical properties of the system

Physical property	Chloroform	Feed liquid
Density/（g·cm^-3）	1.4	1.04
Dynamic viscosity/（mPa·s）	0.563	3.27
Interfacial tension/（mN·m^-１）	5.28

Fig.2 Experimental operation process

Fig.3 Effect of the phase ratio on the extraction efficiency of DMFNote： A.Effect of the phase ratio on the mass fraction of DMF in raffinate； B. Effect of the phase ratio on the extraction rate of DMF

Fig.4 Effect of the flow rate on the extraction efficiency of DMF（O/A=2）Note： A.Effect of the flow rate on the mass fraction of DMF in raffinate； B. Effect of the flow rate on the extraction rate of DMF

Fig.5 Effect of pulse conditions on the condition of dispersed phaseNote： A.Af=0； B.Af=0.01 m/s

Fig.6 McCabe-Thiele graph of DMF extraction by CHCl3

Fig.7 Variation of mass fraction of distillate composition and temperature with time in distillation columnNote： A. Variation of mass fraction； B. Variation of temperature

Fig.8 Process flow diagram

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Study on Extraction Separation of N，N-Dimethylformamide with Chloroform

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