Precipitation study of CO2-loaded glycinate solution with the introduction of ethanol as an antisolvent  

作　　者：Siming Chen Yue Wu Geoffrey WStevens Guoping Hu Wenshou Sun Kathryn AMumford 

机构地区：[1]College of Environmental Sciences and Engineering,Qingdao University,Qingdao 266071,China [2]Peter Cook Centre for Carbon Capture and Storage Research(PCC),Particulate Fluids Processing Centre(PFPC),Department of Chemical Engineering,University of Melbourne,Parkville,Victoria 3010,Australia

出　　处：《Frontiers of Chemical Science and Engineering》2020年第3期415-424,共10页化学科学与工程前沿（英文版）

基　　金：The authors acknowledge the infrastructure support from the Particulate Fluids Processing Centre(PFPC),the Peter Cook Centre(FCC)for Carbon Capture and Storage(CCS).

摘　　要：Focused beam reflectance measurement(FBRM)and 13C nuclear magnetic resonance(13C NMR)analysis were used to study the precipitation process of CO2-loaded potassium glycinate(KGLY)solutions at different CO2 loadings,during the addition of ethanol as an antisolvent at a rate of 10 mL·min−1.The volume ratio of ethanol added to the KGLY solution(3.0 mol·L−1,340 mL)ranged from 0 to 3.0.Three solid-liquid-liquid phases were formed during the precipitation process.The FBRM results showed that the number of particles formed increased with CO2 loading and ethanol addition for CO2-unsaturated KGLY solutions,whilst for CO2-saturated KGLY solution it first increased then decreased to a stable value with ethanol addition.13C NMR spectroscopic analysis showed that the crystals precipitated from the CO2-unsaturated KGLY solutions consisted of glycine only,and the quantity crystallised increased with CO2 loading and ethanol addition.However,a complex mixture containing glycine,carbamate and potassium bicarbonate was precipitated from CO2-saturated KGLY solution with the maximum precipitation percentages of 94.3%,31.4%and 89.6%,respectively,at the ethanol volume fractions of 1.6,2.5 and 2.3.

关 键 词：CRYSTALLIZATION PRECIPITATION GLYCINATE FBRM 13C NMR 

分 类 号：O62[理学—有机化学]