复合添加剂对二氧化碳水合物生成条件影响的实验研究及动力学模型建立

基于水合物法储存分离二氧化碳具有较广阔的应用前景,通过实验研究了复合添加剂对二氧化碳水合物生成条件的影响,选用十二烷基硫酸钠(SDS)和十二烷基苯磺酸钠(SDBS)以及两者的混合溶液作为实验用溶液,研究发现当采用浓度为265mg/L的SDS和SDBS质量比为1:1的复合添加剂溶液时,二氧化碳水合物的相平衡点最低,最易生成,此时的溶液体系能很好的促进水合物生成,而且比单一的SDS溶液或者SDBS溶液体系下水合物的生成条件都有所降低。建立了考虑复合添加剂促进作用的新型水合物生成动力学模型。

Experimental study of effects of compound additives on CO2 hydrate formation conditions and kinetic model establishment

CO2 sequestration and storage based on hydrate has a good prospect of industrial application.The effects of additives on CO2 hydrate formation were studied through the experiments with the aqueous solutions containing sodium dodecyl sulfate(SDS),sodium dodecyl benzene sulphonate(SDBS) or their mixtures as experimental solutions.It was found that the solution containing both of SDS and SDBS(SDS/SDBS mass ratio=1:1) at the concentration of 265 mg/L made the phase equilibrium point of CO2 hydrate fall to minimum and the formation of CO2 hydrate easier.This solution system could promote CO2 hydrate formation better than those solutions containing only SDS or SDBS.And a new kinetic model of CO2 hydrate formation,which had considered the compound effect of additives,was established.