MDEA为主体的复配胺液选择性脱硫性能实验研究

An experimental study on active MDEA mixed amine solutions for natural gas selective desulfurization

在总浓度为2 mol/L的条件下,运用小型反应釜,采用恒压吸收法和恒容吸收法,对以MDEA为主体、DGA与AMP为添加剂的复配胺液进行不同物质的量比下选择性吸收H_2S性能的实验研究。通过分析气相浓度、吸收速率、酸气脱除率及选择性因子,优选出不同复配胺液在此浓度下选择性脱硫的最优配比。实验结果表明:2mol/L MDEA+DGA复配胺液在物质的量比为10∶3时,对原料气中H_2S的吸收速率、脱除率均较高,对CO_2的吸收速率、脱除率均较低,选择性因子最大,为该复配胺液的最优配比;2mol/L MDEA+AMP复配胺液在物质的量比为10∶3时,对原料气中H_2S的吸收速率、脱除率均较高,对CO_2的吸收速率、脱除率均较低,选择性因子最大,为该复配胺液的最优配比。

Small reaction kettles were applied for absorption of H_2S from natural gas using mixed amine solutions composed of the active MDEA and additive DGA and AMP in different proportion using constant pressure absorption method and constant volume absorption method when the total concentration was 2 mol/L.Through analyzing the gas molar concentration,absorption rate,acid gas removal rate and selectivity factor,the mixed amine solution with optimal proportion for selective desulfurization was obtained.The results showed that 2 mol/L MDEA+DGA mixed amine solution had maximum selectivity factor with the optimal molar proportion of 10∶3,which had a higher absorption and removal rate for removing H_2S from natural gas and had a lower absorption and removal rate for removing CO_2 from natural gas.2 mol/L MDEA+AMP mixed amine solution had maximum selectivity factor with the optimal molar proportion of 10∶3,which had a higher absorption and removal rate for removing H_2S from natural gas and had a lower absorption and removal rate for removing CO_2 from natural gas.