Solvent for eliminating H2S from gas mixture

Abstract

The present invention is method of adding one kind of secondary amine and one kind of organic amine with steric effect into water or sulfolane solution of N-methyl diethanolamine to obtain the activator for removing H2S from gas mixture with or without CO2. The present invention provides two solution recipes. The recipe I for the solution suitable for removing H2S from gas mixture containing no or less organic sulfide consists of N-methyl diethanolamine 30-50 wt%, secondary amine 1-10 wt%, steric amine 1-15 wt% and water for the rest. The recipe II for the solution suitable for removing H2S from gas mixture containing organic sulfide consists of N-methyl diethanolamine 30-40 wt%, secondary amine 1-5 wt%, steric amine 1-15 wt%, water 5 wt% and sulfolane for the rest.

Description

Technical field: [0001] The present invention relates to a kind of H from mixed gas 2 The solvent of S belongs to the field of natural gas and petrochemical gas separation. Background technique: [0002] The aqueous solution with N-methyldiethanolamine as the main body is widely used in the desulfurization process of industrial gases. It has the characteristics of large absorption capacity, good selectivity, low regeneration energy consumption, and no corrosion to equipment, so it has a good prospect for popularization and application. . [0003] ZL 93110579.X invented three groups of solutions with different composition formulas: the solution formula suitable for sulfur-free gas is: N-methyldiethanolamine 20-60% by weight, piperazine 1-5% by weight, diethanolamine 1-10% by weight % by weight; there are two groups suitable for sulfur-containing gases: N-methyldiethanolamine 20-60% by weight, N-methyl-ethanolamine 0.1-10% by weight, diethanolamine 1-10% by weight; N-methyld...