研究报告
马伟春,张卫风,焦月潭,黄珍,李靳,钟林新.钙法解吸并固定乙醇胺富液中CO2[J].环境科学学报,2018,38(1):109-114
钙法解吸并固定乙醇胺富液中CO2
- Desorption and mineralization of CO2 in monoethanolamine-rich solution by calcium method
- 基金项目：国家重点研发计划项目（No.2016YFC0209300）
- 作者
- 单位
- 马伟春
- 华东交通大学土木建筑学院, 南昌 330013
- 张卫风
- 华东交通大学土木建筑学院, 南昌 330013
- 焦月潭
- 华东交通大学土木建筑学院, 南昌 330013
- 黄珍
- 华东交通大学土木建筑学院, 南昌 330013
- 李靳
- 华东交通大学土木建筑学院, 南昌 330013
- 钟林新
- 华东交通大学土木建筑学院, 南昌 330013
- 摘要：针对醇胺类吸收剂富液中CO2的解吸及后续处置所存在的不足，提出一种新型解吸方案——钙法.通过CO2负荷试验和Ca（OH）2投加量试验确定了该法理想处理负荷为0.84 mol·L-1，理想投加比例为C：Ca=1：1（摩尔比），此条件下反应15 min和30 min的解吸率达到52.17%和55.02%，这表明钙法矿化解吸乙醇胺富液中CO2是可行的.在此基础上，进一步研究了pH、温度和搅拌强度对CO2解吸固定效果的影响.试验结果表明，CO2解吸率随着pH和搅拌强度的增加而增大，但当pH和搅拌强度增大到一定程度后，解吸率增长放缓甚至出现下降.较高的解吸温度尽管解吸率更大，但高温条件下无法达到矿化固定CO2的目的.CO2二次吸收负荷试验表明经钙法解吸后的MEA再生液具有良好的可重复使用性.
- Abstract：A new process named calcium method, was proposed for the desorption and subsequent treatment of CO2 in the monoethanolamine-rich solution.The ideal treatment loading for CO2 and Ca(OH)2 dosage of this method were 0.84 mol·L-1and C:Ca=1:1(molar ratio), confirmed by loading test and dosing test, respectively. Under these conditions, the desorption rate of CO2 was 52.17% and 55.02% at 15 min and 30 min, respectively, which indicated that the use of Ca(OH)2 for desorption and mineralization of CO2 in monoethanolamine-rich liquid was feasible. Subsequently, the effects of pH, temperature and agitation intensity on the desorption of CO2 were investigated based on the reaction system above. The results showed that the desorption rate of CO2 improved with the increase of pH and agitation intensity. However, when this two parameters increased to a certain high value, the desorption rate of CO2 grew slowly or even declined. With rising the desorption temperature, the desorption rate increased, but the purposes of mineralization and fixture of CO2 can not be achieved when the temperature was high. The secondary CO2 absorption loading test showed that the MEA regeneration solution desorbed by calcium method had good reproducibility.
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