Thermal degradation of diethanolamine at stripper condition for CO2 capture: Product types and reaction mechanisms  

作　　者：Idris Mohamed Saeed Brahim Si Ali Badrul Mohamed Jan Wan Jefrey Basirun Shaukat Ali Mazari Ibrahim Ali Obid Birima 

机构地区：[1]Department of Chemistry,Faculty of Science,University of Malaya,Kuala Lumpur 50603,Malaysia [2]Department of Chemical Engineering,Faculty of Engineering,University of Malaya,Kuala Lumpur 50603,Malaysia [3]Department of Chemical Engineering,Faculty of Engineering,Dawood University of Engineering and Technology,MA Jinnah Road,Karachi 74800,Pakistan

出　　处：《Chinese Journal of Chemical Engineering》2019年第12期2900-2908,共9页中国化学工程学报（英文版）

基　　金：Supported by the University of Malaya Research Grant(RP038C15HTM,RP020C-14AFR,RP031B-15AFR,IPPP(PG209-2014B));the High Impact Research Grant of the University of Malaya(UM.C/625/1/HIR/123).

摘　　要：Amine-based absorption/stripping is one of the promising technology for CO2 capture from natural and industrial gas streams.During the process,amines and CO2 undergo irreversible reactions to produce undesired compounds,which cause corrosion,foaming,increased viscosity and breakdown of equipment,ultimately contributing to the economic loss and environmental pollution.In this study,the thermal degradation of aqueous diethanolamine in the presence and absence of dissolved CO2 was investigated.The experiments were performed in stainless steel cylinders.The results show that thermal degradation in the absence of CO2 was a slow process;triethanolamine,and tris(2-aminoethyl)amine were only the degradation products identified in the mixture In addition,the rate of degradation was very low,only 3%degradation was observed after 4 weeks.But in the presence of CO2,sixteen degradation products were identified,nine of which were new degradation products reported for the first time in this study.The 3-(2-hydroxyethyl)-2-oxazolidinone,1,4-bis(2-hydroxyethyl)piperazine and triethanolamine were the most abundant degradation products.The remaining DEA concentration after 4 weeks was about 20%of the total amine concentration.The most probable degradation reactions and their mechanisms are also proposed.Amine-based absorption/stripping is one of the promising technology for CO2 capture from natural and industrial gas streams. During the process, amines and CO2 undergo irreversible reactions to produce undesired compounds, which cause corrosion, foaming, increased viscosity and breakdown of equipment, ultimately contributing to the economic loss and environmental pollution. In this study, the thermal degradation of aqueous diethanolamine in the presence and absence of dissolved CO2 was investigated. The experiments were performed in stainless steel cylinders. The results show that thermal degradation in the absence of CO2 was a slow process;triethanolamine, and tris（2-aminoethyl）amine were only the degradation products identified in the mixture In addition, the rate of degradation was very low, only 3% degradation was observed after 4 weeks. But in the presence of CO2, sixteen degradation products were identified, nine of which were new degradation products reported for the first time in this study. The 3-（2-hydroxyethyl）-2-oxazolidinone, 1,4-bis（2-hydroxyethyl）piperazine and triethanolamine were the most abundant degradation products. The remaining DEA concentration after 4 weeks was about 20% of the total amine concentration. The most probable degradation reactions and their mechanisms are also proposed.

关 键 词：DIETHANOLAMINE CO2 CAPTURE DEGRADATION Mechanism 

分 类 号：TQ038[化学工程]