摘要
在体积350 m L的恒容反应釜中研究了CO2水合物的生成过程,实验考察了搅拌速率、温度和压力等因素对CO2水合物生成过程的影响。实验结果表明,相对静止条件下机械搅拌可以通过促进传质传热,加速CO2水合物生成过程。随着搅拌速率的增大,CO2水合物的平均生长速率从0.283 mmol/min增大到1.132 mmol/min,且搅拌速率为800 rpm时实验条件下的水合物的诱导期最短;不同实验温度(273.65 K,274.15 K,275.15 K,276.15 K)下,CO2水合物生成过程中的溶解速率、诱导期及反应速率变化不大,即受温度影响不明显;CO2水合物的生长受压力影响明显,增压可显著缩短诱导期、加快反应速率。水合物生长过程主要受客体分子浓度的影响,是动力学控制过程。3 MPa时CO2水合物的平均生长速率高达1.1 mmol/min,是2 MPa时的5倍。
One of the new approaches for capturing carbon dioxide is based on gas hydrate crystallization, which is of broad application prospects. The characteristics of carbon dioxide hydrate formation were investigated exper- imentally in a 350 mL constant volume reactor with the additive of sodium dodecyl sulfate （SDS）. The effects of three influence factors （ stirring rate, temperature and pressure） on the formation of carbon dioxide hydrate were discussed. It is found that carbon dioxide hydrates formed slowly with SDS solution in a quiescent system, but rapidly with stirring. Magnetic mixing accelerated mass transfer and heat diffusion. The higher the stirring rate was, the better the improvement effect was. The induction time of the experiment under 800 rpm was the shortest. With the temperature ranged from 273.65 K to 278.15 K, it showed no obvious influence on carbon dioxide hydrate formation. The concentration of carbon dioxide in the SDS solution can be increased largely by pressure build-up, which resulted in the improvement of the reaction rate. Hydrate formation is a dynamic control process, mainly affected by CO2 concentration. The reaction rate of carbon dioxide hydrates reached 1.1 mmol/ min at 3 MPa, which is about 5 times of that at 2 MPa.
出处
《贵州大学学报（自然科学版）》
2015年第2期42-46,共5页
Journal of Guizhou University:Natural Sciences
基金
国家自然科学基金项目(41276143)
贵州省科学技术基金项目(黔科合J字2013-2131)
贵州大学教育教学改革研究项目(JG2013052)资助
关键词
水合物
二氧化碳
影响因素
诱导期
生成过程
hydrate
carbon dioxide
influence factor
induction time
formation
