Exploiting an Alternative CO2 Absorption Process by Efficient Solvent Mixture

详细信息    查看全文

• 作者：Yun S. Yu ; Ting T. Zhang ; Xiao M. Wu ; De L. Mu ; Zao X. Zhang ; Geoff G. X. Wang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：June 17, 2015
• 年：2015
• 卷：54
• 期：23
• 页码：6165-6174
• 全文大小：445K
• ISSN：1520-5045

文摘

CO₂ capture greatly helps with greenhouse gas mitigation. Chemical and physical absorption can control CO₂ emission, but these methods are costly. To reduce the cost, an efficient solvent mixture of tetramethylammonium hydroxide (TAMH), tetramethylene sulfone (TMS), and ethylene glycol (EG) is assessed. Gas鈥搇iquid equilibrium, reaction kinetics, and mass transfer models are developed and validated by experiments. Henry鈥檚 constant, reaction kinetics, and mass transfer coefficients between CO₂ and TAMH-TMS-EG are identified. CO₂ loading and mass transfer coefficient are, respectively, obtained as 0.55 mol/molTAMH and 4.02kmol/m²/s/kPa, which are on average 25% and 34% higher than the typical MEA process. The theoretical energy consumption amount for desorption of TAMH-TMS-EG-CO₂ solutions is identified as 1.11 GJ/t to 1.34GJ/t. Minimum mass transfer resistance is determined at 40% to 80% TMS fraction. A temperature bulge shift and improvement in the interface characteristics enhance mass transfer due to uniform temperature field and good gas and liquid countercurrent contact.