Abstract:

An experimental apparatus based on isochoric saturation method was developed for measuring gas solubility and volumetric mass transfer coefficient in liquid with expanded uncertainties of temperature, pressure, solubility and volumetric mass transfer coefficient at 0.02K, 0.01%, 2%, and 4%, respectively. The solubility and volumetric mass transfer coefficients of CO₂ in 1-pentanol were determined at temperature from 323 K to 343 K and at pressure from 0.9 MPa to 5.0 MPa. CO₂ solubility in 1-pentanol increased with the increasing pressure. Mole fraction of CO₂ in 1-pentanol was risen by 26% at 323 K, when pressure was increased from 2.5 MPa to 3.2 MPa. However, CO₂ solubility of in 1-pentanol decreased with the increasing temperature. Mole fraction of CO₂ in 1-pentanol also dropped by 26% at pressure of 0.9 MPa when temperature was increased from 323 K to 343 K. Volumetric mass transfer coefficient of CO₂ was risen with increasing temperature and pressure. The CO₂ volumetric mass coefficient showed an increase from 0.0089 s^-1 to 0.0175 s^-1 when conditions of temperature and pressure were changed from 323 K and 1.1 MPa to 343 K and 5.0 MPa.

Key words: isochoric saturation method, absorption, mass transfer, CO₂, 1-pentanol

摘要：

基于等体积饱和法搭建了气体在液体中溶解度与体积传质系数的实验测量系统，该实验系统温度、压力、溶解度、体积传质系数的扩展不确定度分别为0.02 K、0.01%、2%、4%。利用该实验系统测量了温度为323～343 K、压力为0.9～5.0 MPa范围内CO₂在正戊醇中的溶解度和体积传质系数。CO₂在正戊醇中的摩尔分数随着压力的升高而升高，在温度为323 K时，压力从2.5 MPa升高到3.2 MPa，溶解度升高26%。CO₂在正戊醇中的摩尔分数随着温度的升高而减小，在压力为0.9 MPa时，温度从323 K升高为343 K，溶解度降低26%。升高温度和压力都有利于提高体积传质系数，当温度和初始压力分别由323 K、1.1 MPa升高至343 K、5.0 MPa时，CO₂在正戊醇中的体积传质系数由0.0089 s^-1升高至 0.0175 s^-1。

关键词: 等体积饱和法, 吸收, 传质, 二氧化碳, 正戊醇