醇胺法吸收二氧化碳在填料塔中的应用

Absorption of Carbon Dioxide into Aqueous Solutions of Alkanolamines in a Packed Column

采用工业流程中的填料吸收塔和解吸塔,研究了乙醇胺(MEA)、哌嗪(PZ)、二乙烯三胺(DETA)、三乙烯四胺(TETA)与N-甲基二乙醇胺(MDEA)的混合溶液作为吸收剂对模拟合成气中CO2的吸收性能.结果表明,胺活化性能依次为TETA>DETA>PZ>MEA;含TETA的吸收液可将尾气中CO2的浓度降至0.05%(mol),CO2脱除率达98.62%;增加活化剂浓度和降低气体流量有利于提高CO2脱除率;吸收-解吸循环条件下吸收速率是随吸收时间和活化剂浓度变化的指数递减函数.

The removal efficiency of carbon dioxide into the aqueous solutions of N-methyldiethanolamine （MDEA） containing monoethanolamine （MEA）,piperazine （PZ）,diethylenetriamine （DETA） and triethylenetetramine （TETA） as activators in a packed absorption column was investigated. The results indicated that the order of activity capacity of different amines was TETADETA PZMEA. The outlet concentration of CO2 could be decreased to 0.05%（mol） and the removal efficiency could be increased to 98.62% by using TETA as activator. A higher concentration of activator and a lower gas flow rate was more favorable to raising removal efficiency of CO2. The variation of absorption rate with absorption time and concentration of activator by carrying out absorption and regeneration synchronously was studied in details.