高选择性位阻胺脱硫剂试用研究

Trial study of high selective steric hindrance amine desulfurizer

某石化公司溶剂再生装置脱硫溶剂采用MDEA溶剂,其选择性稍差,吸收H2S的同时吸收大量的CO_(2),溶剂再生酸性气中CO_(2)浓度高达70%,造成下游硫磺回收装置出现诸多生产问题。对此,该公司参考同类装置,最终决定采用含位阻胺溶剂来提高溶剂再生装置胺液选择性,降低脱硫过程胺液对CO_(2)的吸收率,从而降低再生酸性气量,提高酸性气中H_(2)S占比,确保硫磺装置稳定运行。通过测试,加入位阻胺成分后溶剂较之未加入前CO_(2)滑脱率提升超过20%,提升了溶剂再生装置系统内溶剂质量。

MDEA solvent with poor selectivity was used as the desulfurizing solvent in the solvent recycling plant of a petrochemical company which absorbed H2S and a large amount of CO_(2),led to the CO_(2) concentration in the solvent recycling acid gas up to 70% that resulted in some production problems to downstream sulfur recovery plant.Therefore,referred to the similar plants,the company finally decided to use a steric amine solvent to improve the selectivity of the amine solution of the solvent regeneration plant,reduced the absorption rate of CO_(2) of the amine solution in the desulfurization process,thereby reducing the acidic gas volume of the regeneration,increasing the proportion of H_(2)S in the acidic gas,and ensuring the stable operation of the sulfur plant.Through the test,the CO_(2) slippage rate of the solvent increased by more than 20% after the addition of steric amine,which improved the solvent quality in the solvent regenerator system.