Experimental Study On Screening Formula Of Amine Solution In Natural Gas Selective Desulfurization

With the progressive development of the natural gas industry,gas pretreatment and utilization of technology is received more attention.During the actual production process,appropriate pretreatment process should be choosed based on the kind of acid of feed gas and the quality requirement of purified gas.Selective desulfurization process as the most widely used method of nature gas acid removal is gradually become the focus of the research.It aims to reduce amine cycle flow and the consume energy of regeneration system.In addition,it can also purify the sulfur recovery gas and reduce the size of equipment.This paper on the basis of prophase gas amine desulfurization and decarbonization of and summarize the absorbent properties.Researched for nine single amine may have selectivity such as MEA,DEA,TEA,MDEA and DIPA,DGA,TBEE,AMP and Sulfolane.Analysis the CO₂ and H₂S removal efficiency and selection of performance in different amine comparatively.Selected the main absorbers and additives of mixed amine.By comparing the different concentrations of the amine and the absorption temperature of the main amine liquid and additives,the better amine solution formula and the corresponding total amine concentration were determined.Finally,the optimal ratio of different amine formula was determined by optimizing the formula of the amine solution.Formed a set of system of natural gas selective desulfurization amine liquid screening and optimization research methods.Selected the optimal amine liquid formula is 2mol/L MDEA+Sulfolane which molar ratio is 10:3.By analyzing the select performance and energy consumption in different operation parameters,the result of adaptability based on the optimal amine formula obtain the followings.Under the raw materials gas processing volume of 21130kg/h in actual process,the optimal absorption temperature is 40℃as well as the amine cycle flow ranges from 62465 kg/h to64465kg/h.The results of the study can provide the theory guide and reference for the formulation selection and engineering design of the natural gas selective desulfurization.