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›› 2008, Vol. 8 ›› Issue (2): 235-239.

• 流动与传递 • 上一篇    下一篇

不同性质有机分散相对CO2吸收过程的影响

卢素敏 马友光 沈树华 朱春英   

  1. 天津大学化工学院 化学工程联合国家重点实验室 天津大学化工学院化学工程联合国家重点实验室 天津大学化工学院化学工程联合国家重点实验室 天津大学化工学院化学工程联合国家重点实验室
  • 收稿日期:2007-08-21 修回日期:2007-10-31 出版日期:2008-04-20 发布日期:2008-04-20
  • 通讯作者: 马友光

Effect of Dispersed Oil Phases with Different Properties on CO2 Absorption Process

LU Su-min MA You-guang SHEN Shu-hua ZHU Chun-ying   

  1. School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University
  • Received:2007-08-21 Revised:2007-10-31 Online:2008-04-20 Published:2008-04-20
  • Contact: MA You-guang

摘要: 分别以环己烷、甲苯、正庚烷和正丁醇4种不同性质的有机溶剂作分散相,采用恒温槽反应器测定了CO2在水中的吸收速率. 结果表明,吸收速率与界面性质有关,未加表面活性剂时,甲苯、环己烷、正庚烷乳液中的传质速率与其在气液界面上的铺展状况相对应,甲苯>正庚烷>环己烷,铺展所产生的油膜造成了附加阻力,使低体积分率时CO2吸收速率反比纯水中低,最小时甲苯、环己烷、正庚烷所对应的体积分率分别为0.02, 0.08和0.04. 表面活性剂的加入促使乳液更趋稳定,但由于表面活性剂在气液界面及油水界面的吸附,传质阻力显著增加,吸收速率较无表面活性剂时更低,对此现象进行了理论分析. 与甲苯、环己烷等不同,正丁醇/水为部分互溶体系,在实验浓度范围内,吸收速率呈现先上升后逐渐下降的趋势,乳液与纯水中吸收速率比J/J0最高点与正丁醇在水中的溶解度相对应.

关键词: CO2乳液吸收, 吸收速率, 界面阻力, 铺展系数

Abstract: The absorption of CO2 into emulsions was investigated using four organic solvents with different properties as dispersed phase, toluene, cyclohexane, n-heptane and n-butanol in a thermostatic reactor. The experimental results show that the absorption rate is closely related to the interfacial properties. When surfactants are not added, the absorption rates of CO2 in the emulsions of toluene, cyclohexane and n-heptane corresponding to their spreading behavior at the gas-liquid interface are: toluene > n-heptane > cyclohexane. Furthermore, a lower absorption rate than that in pure water is observed at low oil volume fraction due to the additional resistance by the spread oil film. The oil volume fractions for toluene, cyclohexane and n-heptane are 0.02, 0.08 and 0.04 respectively at the lowest value of J/J0. The emulsifier promotes the stabilization of the emulsion, however, it increases the resistance of mass transfer due to the adhesion of the surfactants to the gas-liquid and liquid-liquid interfaces, leading to an even lower absorption rate than in the dispersed system without addition of surfactants. Contrary to toluene, cyclohexane and n-heptane, variation of an initial rise following subsequent decline of the absorption rate is found in the partially miscible n-butanol-water system in the range of concentration discussed, and the maximum value of J/J0 coincides with the solubility of n-butanol in water.

Key words: CO2 absorption in emulsion, absorption rate, interfacial resistance, spreading coefficient

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