Study On The Performance Of Diol-based Absorbent For Desulfuriztion And Decarboniza

Due to the conversion and utilization of coal and fossil raw materials,flue gas emissions are the main cause of environmental pollution and global warming.The large amounts of SO₂and CO₂in the flue gas seriously endanger human health and the natural environment.Therefore,resource conversion of SO₂and CO₂gas has always been the focus of research at home and abroad.This article aims to develop a new type of acid gas absorbent for SO₂and CO₂gas removal,and to further explore its absorption mechanism.In this paper,1,3 butanediol+DMSO system and ethylene glycol+ethylenediamine system were selected to research on flue gas absorption,which provides a theoretical basis for the sustainable development and utilization of new absorbents.First of all,based on the good absorption of SO₂indicating that there was a strong force between alcohol and DMSO.1,3-butanediol（BTD）+dimethyl sulfoxide（DMSO）binary system wass selected as the absorbent of low concentration SO₂.After measuring the SO₂gas-liquid equilibrium（GLE）data of the system at different temperatures and fitting its Henry coefficient.The mechanism of action of SO₂was proposed by means of characterization.The binary system was analyzed through 5 cycles,and the solvent consumption of the binary system in the repeated process was judged.By measuring the basic data of density and viscosity,the study found that the molar ratio of the strongest hydrogen bonding force of the binary system was 1:1.Secondly,based on the previous research of the research group,the ethylene glycol（EDA）+ethylene diamine（EG）system captures and fixes CO₂to obtain a white solid substance storage material（CO₂SM）,whose structure was similar to alkyl ammonium carbonate.Taking advantage of the characteristic that CO₂SM can release CO₂during the process of dissolving in water,the hydrothermal method reacts CO₂SM and lanthanum nitrate hexahydrate solution to produce lanthanum metal carbonate（Lanthanum Carbonate:La₂O（CO₃）₂,La₂（CO₃）₃.8H₂O,La₂O₂CO₃and La CO₃（OH））,and investigated the effects of CO₂SM dosage,hydrothermal temperature,hydrothermal time,and lanthanum ion concentration on the preparation of lanthanum Carbonate.Finally,three morphologies（flower-shaped,rod-shaped,and spherical）of lanthanum were obtained.Metal carbonate.X-ray diffraction（XRD）,Fourier Transform infrared spectroscopy（FTIR）,Transmission electron microscope（TEM）,Brunner-Emmet-Teller measurements（BET）and other characterization methods were used to study the formation mechanism of lanthanum carbonate.Finally,La₂O₃crystals were obtained after calcination,and CO₂adsorption was studied under high temperature and normal pressure.The results show that La₂O₃crystals show good adsorption activity and cycle stability for CO₂.The whole process integrates SO₂and CO₂capture,storage and resource utilization.This innovative method provided a broad application prospect for the comprehensive utilization of emission reduction flue gas.At the same time,it lays the foundation for the application of liquid and solid absorption desulfurization and decarbonization technology.Finally,three morphologies（flower-like,rod-like,and spherical-like）of lanthanum carbonate were prepared.The formation mechanism of lanthanum carbonate was studied by XRD,FTIR,TEM,BET and other characterization methods.Finally,La₂O₃crystals were obtained after calcination,and CO₂adsorption was studied under high temperature and normal pressure.The results show that La₂O₃crystals present good adsorption activity and cycle stability for CO₂.Whole process integrates SO₂and CO₂capture,storage and resource utilization.This innovative method provided a broad application prospect for the comprehensive utilization of emission reduction flue gas.At the same time,it lays the foundation for the application of liquid and solid absorption desulfurization and decarbonization technology.