Experimental research of CO2 absorption by composite solution based on group contribution method

doi:10.16085/j.issn.1000-6613.2016.03.021

Abstract

Abstract: Based on principles of group contribution,the formulations of composite solution for CO₂ absorption were designed. By comparing the influences of different molecular structure on basicity,and steric hinerance,the activating agent HZ showed the best activation effect and therefore was selected. The composite solution was compounded by adding appropriate amount of activating agent HZ in the MDEA solution. With the absorption-regeneration experimental device,the CO₂ absorption capacity of composite solution was evaluated under normal pressure. The appropriate amount of HZ,the best absorption temperature and the best regeneration temperature were confirmed. The experimental results showed that activating agent HZ had better activating effect than MEA,DEA,PZ. The appropriate amount of activating agent HZ in composite solution was 0.7mol/L and the best absorption temperature was 40℃and H₂S could decrease the absorption of CO₂; the best regeneration temperature was 115℃ and the composite solution had excellent foam resistance capacity.

Key words: group contribution method, natural gas purification, methyldiethanolamine, carbon dioxide, hydrogen sulfide

摘要： 基于基团贡献法的基本原理,对用于脱除天然气中CO₂的复合溶剂进行组成设计。通过对比不同活化剂分子结构对其碱性、空间位阻效应等物化参数的影响,筛选出最佳的CO₂活化剂HZ,与N-甲基二乙醇胺(MDEA)水溶液混合组成复合溶剂。采用常压吸收-常压再生实验装置测定复合溶剂对CO₂的脱除能力,考察了活化剂种类、活化剂添加量、吸收温度、H₂S浓度和再生温度等因素对CO₂脱除效果的影响,以及复合溶剂的抗发泡性能。实验结果表明:活化剂HZ的活化效果优于MEA、DEA和PZ;HZ最佳添加量为0.7mol/L;最佳吸收温度为40℃;原料气中H₂S浓度增加,会降低复合溶剂对CO₂的脱除效果;最佳再生温度为115℃;复合溶剂具有良好的抗发泡性能。

关键词: 基团贡献法, 天然气净化, N-甲基二乙醇胺, 二氧化碳, 硫化氢

CLC Number:

TE64

SHI Huilong, LI Chunhu, ZHANG Xiangkun, CHI Minghao. Experimental research of CO₂ absorption by composite solution based on group contribution method[J]. Chemical Industry and Engineering Progree, 2016, 35(03): 787-792.

石会龙, 李春虎, 张祥坤, 迟明浩. 基于基团贡献法的CO₂复合吸收溶剂实验研究[J]. 化工进展, 2016, 35(03): 787-792.

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Experimental research of CO₂ absorption by composite solution based on group contribution method

基于基团贡献法的CO₂复合吸收溶剂实验研究

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