DBU/甘油/CO2反应过程及动力学

1，8-二氮朵双环5.4.0]十一碳-7-烯（DBU）-甘油溶液作为一种新型溶剂，具有低热容、高沸点等优点，目前被广泛研究应用于化学合成和产物分离等。本文考察了不同摩尔比的DBU-甘油溶液吸收CO₂效果，测定了不同摩尔比的DBU-甘油溶液吸收CO₂反应过程中体系的黏度变化，研究了DBU-甘油溶液吸收CO₂反应的动力学。结果表明，在反应温度25℃、CO₂气体流速为238mL/min的条件下，DBU与甘油摩尔比为0.49~1的溶液对CO₂的吸收量可在120min的反应时间内达到10.88g/100g溶液；DBU与甘油摩尔比为0.49∶1和1.12∶1的溶液在吸收CO₂后体系的黏度显著增大，而DBU与甘油摩尔比为0.11∶1和3.43∶1的溶液在吸收CO₂后体系的黏度变化较小。25℃、常压下，在消除扩散影响，甘油大大过量时，DBU/甘油/CO₂反应的速率方程为r=0.22C_DBUP_CO2^0.5，反应的活化能为40.44kJ/mol。

Reaction progress and kinetics of CO2 with glycerol in the presence of DBU

1,8-diazabicyclo5.4.0] undec-7-ene(DBU)/glycerol solution used as a new solvent,which has low heat capacity and high boiling point,has been widely studied in chemical synthesis and product separation. The absorption of CO₂ at different ratios of DBU/glycerol solutions was investigated. It is shown that the amount of CO₂ absorbed in this solution could reach 10.88g/100g within 120min at 25℃ under atmospheric pressure,0.49:1 of the molar ratio of DBU to glycerol and 238mL/min of the flow rate of CO₂. The viscosity of the solution at different ratios during reaction was also measured. It increased with the increase of time and the amount of DBU when the molar ratio of DBU and glycerol was 0.49:1 and 1.12:1. But, when the molar ratio of DBU to glycerol was 0.11:1 and 3.43:1,the viscosity of the solution changed a little. Furthermore,the kinetics of carbon dioxide binding by DBU/glycerol solution was studied. The reaction rate of DBU/glycerol/CO₂ can be expressed as r=0.22C_DBUP_CO2^0.5 at 25℃ without the effect of agitation under atmospheric pressure when glycerol is excessive. The activation energy of the reaction is 40.44kJ/mol.