Kinetics of reactive absorption of carbon dioxide with solutions of 1,6-hexamethylenediamine in polar protic solvents
Kinetics of reactive absorption of carbon dioxide with solutions of 1,6-hexamethylenediamine in polar protic solvents
复制标题
DOI：
10.1016/j.seppur.2010.07.002
复制
发表时间：
2010-09
影响因子：
8.6
通讯作者：
S. Dinda;V. Goud;A. Patwardhan;N. Pradhan
中科院分区：
文献类型：
--
作者：
S. Dinda;V. Goud;A. Patwardhan;N. Pradhan
在搅拌池和模型搅拌接触器中，在 303±1K 温度下研究了 1,6-六亚甲基二胺 (HMDA) 的甲醇和水溶液对二氧化碳的反应吸收。使用适当尺寸的皂膜计测量大气压下纯CO2的体积吸收率。二氧化碳分压从0.41到0.96atm变化，液相反应物HMDA浓度从0.5到3.0kmolm−3变化。使用传质和化学反应理论来分析比吸收率。发现相对于CO2和HMDA各自以水作为溶剂的反应级数为0.85。发现 303±1K 时的固有动力学速率常数 (km,n) 在 (1.1–1.5)×102(kmolm−3)−0.7s−1 范围内。在甲醇作为溶剂的情况下，反应似乎是瞬时反应方式。这些数据预计将有助于氨基甲酸酯/异氰酸酯合成工艺开发中二氧化碳吸收剂的设计和规模化。
Reactive absorption of carbon dioxide with solutions of 1,6-hexamethylenediamine (HMDA) in methanol and water was studied in stirred cell and model stirred contactor at 303±1K. The volumetric rate of absorption of pure CO2, at atmospheric pressure, was measured using a soap-film meter of appropriate size. Carbon dioxide partial pressure was varied from 0.41 to 0.96atm and concentration of liquid phase reactant HMDA was varied from 0.5 to 3.0kmolm−3. The specific absorption rates were analysed using mass transfer with chemical reaction theory. The reaction order was found to be 0.85 with respect to CO2and HMDA each in water as solvent. The intrinsic kinetic rate constants (km,n) at 303±1K were found to be in the range of (1.1–1.5)×102(kmolm−3)−0.7s−1. In the case methanol as solvent, the reaction appeared to be the instantaneous reaction regime. These data are expected to be useful for the design and scale up of carbon dioxide absorbers in the process development for carbamates/isocyanates synthesis.