二氧化碳水合物生成驱动力的研究

选用摩尔吉布斯自由能的变化作为水合物生成的通用驱动力,推导CO2水合物的水合反应驱动力表达式。通过雾流强化水合反应系统装置,针对CO2水合物的生成驱动力进行实验研究,揭示CO2水合物生成过程动力学特性。结果表明,水合反应系统压力越高、温度越低,CO2水合物的生成驱动力数值的绝对值越大,越有利于CO2水合物的生成;在275.15K,随着压力的增加,驱动力增强,但不呈线性,而是从快到慢渐趋于平缓,驱动力数值的绝对值为0.1820kJ/mol~1.1903kJ/mol;CO2水合物的生成量随着实验条件生成驱动力的增加而增大。

Study on driving force for carbon dioxide hydrate formation

The molar Gibbs free energy was chosen as the general driving force.The expression of carbon dioxide formation driving force was calculated theoretically.An experimental study on the driving force for carbon dioxide hydrate formation by spray device was performed to reveal the basic dynamics properties in the hydrate formation process.The resulted indicated that the higher the pressure or the lower the temperature,the greater the absolute value of the driving force,which was more beneficial to the formation of carbon dioxide hydrate.At 275.15K,the driving force enhanced nonlinearly with the increase of pressure in a gradient descent rate tended to be slow,and the absolute value of the driving force was in the range of 0.1820 to 1.1903kJ.mol-1.The formation of carbon dioxide hydrate increased with the driving force under experimental conditions.