Vapor-liquid equilibrium of ethylene in low viscous dicyanamide-based ionic liquids

YANG Rui; DONG Li; CHEN Songsong; CHENG Weiguo; CAO Junya

doi:10.11949/0438-1157.20190080

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Vapor-liquid equilibrium of ethylene in low viscous dicyanamide-based ionic liquids

Thermodynamics | 更新时间：2026-07-24

- Vapor-liquid equilibrium of ethylene in low viscous dicyanamide-based ionic liquids
- CIESC Journal Vol. 70, Issue 7, Pages: 2439-2447(2019)
- 作者机构：
  
  1.中国矿业大学（北京）化学与环境工程学院，北京 100083
  2.中国科学院过程工程研究所离子液体清洁过程北京市重点实验室，北京 100090
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190080
  CLC： TQ 028.8
- Received：25 January 2019，
  
  Revised：2019-04-16，
  
  Online First：24 July 2026，
  
  Published：05 July 2019
- 稿件说明：
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杨瑞, 董丽, 陈嵩嵩, 成卫国, 曹俊雅. 低黏二氰胺类离子液体乙烯汽液相平衡研究[J]. 化工学报, 2019, 70(7): 2439-2447

YANG Rui, DONG Li, CHEN Songsong, CHENG Weiguo, CAO Junya. Vapor-liquid equilibrium of ethylene in low viscous dicyanamide-based ionic liquids[J]. CIESC Journal, 2019, 70(7): 2439-2447
杨瑞, 董丽, 陈嵩嵩, 成卫国, 曹俊雅. 低黏二氰胺类离子液体乙烯汽液相平衡研究[J]. 化工学报, 2019, 70(7): 2439-2447 DOI： 10.11949/0438-1157.20190080.

YANG Rui, DONG Li, CHEN Songsong, CHENG Weiguo, CAO Junya. Vapor-liquid equilibrium of ethylene in low viscous dicyanamide-based ionic liquids[J]. CIESC Journal, 2019, 70(7): 2439-2447 DOI： 10.11949/0438-1157.20190080.

摘要

从工业废气中回收分离乙烯（C

）具有重要意义，选用了三种低黏度二氰胺类离子液体，分别测定了293.15~333.15 K下其密度、黏度等物化性质，研究了其对乙烯（C

）吸收性能。采用非随机（局部）双液体模型（NRTL）关联了三种二元体系溶解度数据，实验值与计算值的平均相对偏差均小于3%。结果表明，低黏度二氰胺类离子液体对C

气体吸收性能良好，其中阳离子侧链长度增加和羟基功能团引入可增强对C

溶解度。同时，离子液体1-丁基-3-甲基咪唑二氰胺盐（[Bmim

]

[DCN

]

）经过3次的吸收解吸循环，仍可以保持较好的C

吸收性能，表明该离子液体循环稳定性好，而1-丁基-3-甲基咪唑二氰胺盐（[Bmim

]

[DCN

]

）对乙烯吸收量较高，具有作为C

吸收剂的潜力。

Abstract

Three dicyandiamide-based ionic liquids with low viscosity were selected as absorbent for ethylene absorption. The physicochemical properties such as density and viscosity were measured at 293.15－333.15 K

and their properties were studied. The NRTL model was used to correlate the solubility data for the three binary systems. The

average relative deviations (ARDs) between the experimental and calculated values of the three binary systems are 2.47%

2.54% and 1.19%

respectively. The results show that the low viscous dicyandiamide-based ionic liquids presented good C

absorption performance. The solubility of C

in ionic liquids is improved by increasing the length of side-chain and introducing hydroxyl group in the imidazole cation. The C

solubility would increase with decreasing temperature or increasing pressure. Furthermore

these ionic liquids such as [Bmim

]

[DCN

]

exhibited outstanding reversibility after 3 times of absorption/desorption circulation. [Bmim

]

[DCN

]

has the better C

solubility than the other two

showing the potential to be C

absorbent.

关键词

Keywords

references

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