SEPARATING C4 BY EXTRACTIVE DISTILLATION WITH ADDED SALT - DMF

雷志刚; 周荣琪; 段占庭

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SEPARATING C4 BY EXTRACTIVE DISTILLATION WITH ADDED SALT - DMF

更新时间：2025-12-16

- SEPARATING C4 BY EXTRACTIVE DISTILLATION WITH ADDED SALT - DMF
- CIESC Journal Issue 3, (1999)
- 作者机构：
  
  清华大学化工系,清华大学化工系,清华大学化工系北京100084,北京100084,北京,100084
- 作者简介：
- 基金信息：
- DOI：
  CLC： Q202
- Online First：25 June 1999，
  
  Published：25 June 1999
- 稿件说明：
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雷志刚, 周荣琪, 段占庭. SEPARATING C4 BY EXTRACTIVE DISTILLATION WITH ADDED SALT - DMF[J]. CIESC Journal, 1999, (3).
DOI：

雷志刚, 周荣琪, 段占庭. SEPARATING C4 BY EXTRACTIVE DISTILLATION WITH ADDED SALT - DMF[J]. CIESC Journal, 1999, (3). DOI：

摘要

C4组分是由含有4个碳原子的丁烷、丁烯、丁二烯和炔烃等分子所组成的混合物。其中丁二烯是合成橡胶的重要单体

用途十分广泛。由于C4各组分之间的沸点很接近

用普通的精馏方法将丁二烯从中分离出来几乎是不可能的。文献中报道的分离C4生产丁二烯最具竞争力的方法是萃取精馏法。萃取精馏最大的弱点是溶剂比大

大溶剂量降低了塔的生产能力和塔板效率

抵消了由于加入溶剂后提高相对挥发度使所需塔板数减少的效果。所以降低溶剂比

提高溶剂分离能力

对整个过程的技术经济指标有着重要的影响。目前常用的溶剂是:乙腈（ACN）、N-甲基砒咯烷酮（NMP）、二甲基甲酰胺（DMF）。其中ACN和NMP可以通过加入一定量的水来提高C4各组分之间的相对挥发度

而DMF由于强烈的水解作用

不能与水混用

因此

希望能够找到另一种物质对之进行改性

提高其选择性。

Abstract

The inert gas stripping method has been used to determine the C4 relative volatility in DMF and salt added DMF respectively at infinite dilution. The result showed that salt added DMF was better in separating C4. Through the model calculation of the first extractive distillation tower

the amount of solvent was reduced by 10.5 % and the heat duty decreased by 17.5 % on the reboiler

by 8.0 % on the condenser with salt added DMF

compared with DMF without salt. The idea of adding salt in solvent provided an important reference for separating non - polar system by extractive distillation.

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