中变气脱碳-变压吸附联合提取H_2和CO_2工艺中CO_2溶解度的测定

在模拟工业上采用N-甲基二乙醇胺(MDEA)脱除CO2(简称脱碳)装置的基础上,采取一系列改进措施,建立了一套实验室脱碳装置,弥补了工业脱碳过程中分析方法的不足,所得实验数据较为准确。在中变气脱碳-变压吸附(PSA)联合提取H2和CO2工艺条件下,测定了CO2在4.28mol/LMDEA水溶液中的溶解度。实验结果表明,实验值与文献值能够很好地吻合,实验装置及分析方法准确度较高,丰富了温度为70～120℃、压力为131～422kPa范围内CO2在MDEA水溶液中的溶解度数据;实验结果为中变气脱碳-PSA联合提取H2和CO2工艺提供了可靠的理论依据和设计参数,对该工艺的具体实施具有指导意义,并验证了提高解吸压力构想的可行性。

Determination of CO2 Solubility in N-Methyldiethanolamine Aqueous Solution for Combination of Medium Temperature Shift with Pressure Swing Adsorption

Laboratory equipment which simulated the industrial decarburization from medium temperature shift gas through N-methyldiethanolamine(MDEA) absorption was established by application of a series of improvement measures. Solubility of CO2 in 4.28 mol/L MDEA aqueous solution was determined under the conditions of abstractions of hydrogen and CO2 in combination of medium temperature shift unit with pressure swing adsorption(PSA) unit. The experiment showed that the determined CO2 solubility fit well with literature data,and made up for data base about the CO2 solubility in the temperature range from 70 ℃ to 120 ℃ and pressure range from 131 kPa to 422 kPa. The experimental results could provide useful design parameters for abstractions of hydrogen and CO2 in combination of medium temperature shift unit with PSA unit.