乙醇胺为主体的CO_2吸收剂的复配研究

Study of a mixed CO_2 compound absorbent for CO_2 with monoethanolamine as the main component

以改善乙醇胺(MEA)水溶液吸收负荷、吸收速率、再生程度和防腐蚀等性能为目标,对以MEA为主体的复配吸收剂的性能进行了研究。结果表明,在MEA水溶液中加入哌嗪(PZ)或者2-氨基-2-甲基-1-丙醇(AMP)能提高MEA水溶液吸收CO2的负荷、平均吸收速率和再生性能。在溶液中加入少量氧化膜型缓蚀剂能有效抑制吸收剂溶液对碳钢的腐蚀,吸收剂溶液对碳钢的腐蚀速率从无缓蚀剂条件下的1.96 g/(m2.h)可降低到0.2 g/(m2.h)左右,极大地改善了吸收剂溶液的防腐蚀性能,对碳钢材料起到了较好的保护作用,缓蚀效果为偏钒酸钠>铬酸钾>重铬酸钾>亚硝酸钠>硝酸钠>磷酸钠>亚硫酸钠。

A monoethanolamine（MEA）-based compound absorbent for CO2 has been investigated in attempt to improve its performance in terms of absorption load,absorption rate,extent of regeneration and corrosion inhibition.The results showed that addition of piperazine（PZ） or 2-amino-2-methyl-1-propanol（AMP） can improve the performance of an aqueous MEA solution in respect of both carbon dioxide absorption and regeneration capability.Carbon steel corrosion can be effectively inhibited by adding a small amount of an oxide film corrosion inhibitor to the MEA solution The experiments showed that when such corrosion inhibitors were added,corrosion by MEA solution was significantly inhibited and carbon steel materials were protected effectively against corrosion,with the corrosion rate being reduced from 1.96 g/（m^2·h） to as low as 0.2 g/（m^2·h）.The corrosion inhibition efficiency was observed to decrease in the order sodium metavanadate〉 potassium chromate 〉potassium dichromate 〉sodium nitrite 〉sodium nitrate 〉sodium phosphate 〉sodium sulfite.