DBU-based CO2 absorption-mineralization system: Reaction process,feasibility and process intensification

作     者：Cong Luo Kejing Wu Hairong Yue Yingying Liu Yingming Zhu Wei Jiang Houfang Lu Bin Liang Cong Luo;Kejing Wu;Hairong Yue;Yingying Liu;Yingming Zhu;Wei Jiang;Houfang Lu;Bin Liang

作者机构：School of Chemical EngineeringSichuan UniversityChengdu 610065China Institute of New Energy and Low-carbon TechnologySichuan UniversityChengdu 610207China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2020年第28卷第4期

页      面：1145-1155页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 081701[工学-化学工程] 

基　　金：the National Natural Science Foundation of China(No.21878190) National Key R&D Program of China(2018YFB0605700)for financial support 

主　　题：CO2 mineralization CaCO3 1,8-Diazabicyclo[5.4.0]undec-7-ene aqueous Reaction process 

摘      要：Amine-based carbon dioxide(CO2)capture is still limited by high desorption energy *** CO2 into carbonate is a safer and more permanent *** this work,calcium oxide(CaO)is introduced to perform chemical desorption instead of thermal desorption on 1,8-diazabicyclo[5.4.0]undec-7-ene(DBU)aqueous solution after CO2 *** X-ray diffraction(XRD)patterns of solid products show the formation of calcite calcium carbonate(CaCO3),which prove the feasibility of this *** effects of reaction temperature,reaction time and Ca2+/CO32-molar ratios on the related reactions in CO2 absorption-mineralization process and CaCO3 precipitation are discussed,and purer CaCO3 is obtained by ultrasonic *** CaCO3 content can be increased to 95.8%and the CO2 desorption ratio can achieve 80%by 30 min ultrasonic dispersion treatment under the conditions(40℃,180 min,Ca2+/CO32-molar ratio=1.0).After five cycles,DBU aqueous solution shows stable CO2 absorption and mineralization *** transform infrared spectroscopy(FT-IR)spectra of the reaction process also indicate the regeneration of the *** with thermal desorption,this process is exothermic,almost without no additional heat.