活化甲基二乙醇胺溶液吸收CO_2的动力学

Kinetics Study on Absorption of Carbon Dioxide into Activated MDEA Solutions

采用圆盘塔在常压、温度３０～７０℃、ＭＤＥＡ（甲基二乙醇胺）浓度１．７５～４．２１ｋｍｏｌ／ｍ３、哌嗪浓度０．０４１～０．２１ｋｍｏｌ／ｍ３条件下，研究了活化ＭＤＥＡ吸收ＣＯ２的动力学。动力学数据证实了ＣＯ２与哌嗪之间进行着拟一级均匀［４］活化反应机理，其吸收速率可由并行拟一级快速可逆反应吸收来表示： 式中：ｋｐ＝２．９８×１０（１１）ｅｘｐ（－６４２４／Ｔ），表观活化能为５３．４１ｋＪ／ｍｏｌ。

A disc column was used to investigate the kinetics of carbon dioxide absorption into activated MDEA solutions under atmospheric pressure,temperature of 30～70℃ and conecentration of 1. 71～4. 21 kmol/m3 for MDEA and 0. 041～0. 21 kmol/m3 for piperazine. The kinetics data demonstrated that the mechanism of pseudo-first-order homogeneous activation is conducted between CO2 and piperazine,and rate of absorption can be described by an expression of paralled two pseudofirst-order rapid reversible reaction ,that is where Kp,the apparent activation energy is 53.41KJ/mol.