Synthesis Of Sterically Hindered Amine BBAP And BIAP And Its Desulfurization And Decarbonization Performance

With the development of world economy,energy consumption has increased sharply,which leads to the growing emission of greenhouse gases and significantly affects people's life quality.Coal,oil and natural gas,as the important components of worldwide primary energy structure,still occupies a leading position in China's energy consumption structure.Compared with coal and oil,natural gas is paid more and more attention due to its cleanness and high efficiency.However,the natural gas exploited from gas well contains impurities,such as H2S,CO2 and so on.And it requires purification treatment before supplying to the users.At present,alcohol-amine method is been widely employed in natural gas purification industry.But the traditional alcohol-amine solvent has limitations in dealing with natural gas with special characteristics.Thus,it is meaningful to research and develop new type of alcohol-amine solvent with high reactivity and high selectivity.And as a novel lyosorption of acid gas,stereo-hindered amine becomes an advanced research hotspot in natural gas purification industry.In this paper,1,3-2 isopropylamine-2-propanol?BIAP?and 1,3-2 sec-butylamine-2-propanol?BBAP?were synthezed in the basis of structure analysis of stereo-hindered amine and research of steric-hinderance effect.Moreover,in order to verify that the synthetic products were the target materials,infared spectrum?IR?and 1H NMR spectroscopy were employed.Synthesis conditions were optimized based on single-factor analyses and orthogonal experiments analyses.The optimized conditions of BIAP were as follows:the reaction time was 9h,the isoproplyamine-to-1,3-2chlorine-2-propanol mole ratio was 5:1,reaction temperature was 120?,solvent amount was 100mL.And BBAP optimized synthesis conditions were as follows:the sec-butylamine-to-1,3-2 chlorine-2-propanol mole ratio was 4:1,the solvent amount was 140mL,the reaction time was 6h,the reaction temperature was 110 ?.After optimization,the yield of BIAP was 73.1%,which was 1.99 times higher than that before optimization,while the yield of BBAP achieved 81.7%,which was 1.71 times higher than that before optimization.Selectivity,sour gas load and CO₂ adsorptivity were employed to evaluate the desulphurization and decarbonization performance of the synthesized solvents,and the comparison of the BIAP,BBAP,MDEA and TEBB were achieved.The results showed that the rank of selectivity was BBAP>BIAP>TBEE>MDEA,the rank of absorbed burden of H2S was BBAP>BIAP>TBEE>MDEA,the rank of absorbed burdent of CO2 was MDEA>TBEE>BIAP>BBAP,the rank of CO2 adsorptivity was MDEA>TBEE>BIAP>BBAP.In general,the generation of BIAP and BBAP was available,and the regenerability was favorable.The MDEA was added into BIAP and BBAP solutions separately to prepare the MDEA-BIAP solution and MDEA-BBAP solution.And the desulfurization performance of the complex solutions was measured,and the results were compared with MDEA solution.It showed that the desulfurization and decarbonization performance of complex solutions was better than that of MDEA solution.