静态条件下表面活性剂促进HCFC–141b水合物生成

Enhancement of HCFC–141b hydrate formation with surfactants in a static system

为了研究不同类型表面活性剂对HCFC-141b(CH3CCl2F)水合物生成的影响,在静态条件下研究了脂肪醇聚氧乙烯醚(AEO-9)、脂肪醇聚氧乙烯醚硫酸钠(AES)和吐温80(Tween80)3种表面活性剂对HCFC-141b水合物形成诱导时间、生成速率和蓄冷量的影响。结果表明过冷度越大,越有利于水合物的生成。AEO-9、AES和Tween80的最佳添加量分别为w=2.5%、0.1%和2%,在0.2℃实验条件下对应的HCFC-141b水合物生成诱导时间分别为63、67和89 min,该条件下HCFC-141b水合物的蓄冷量分别为167.74、122.47和202.73 kJ·kg^-1,水合物平均生成速率分别为3.97、2.70和4.12 kJ·kg^-1min^-1。AEO-9有利于HCFC-141b水合物成核,Tween80更有利于水合物生长和提高蓄冷密度。非离子表面活性剂AEO-9和Tween80促进HCFC-141b水合物生成机理主要是胶束理论,而阴离子表面活性剂AES对HCFC-141b水合物形成促进主要是吸附作用,AEO-9和Tween80对HCFC-141b水合物生成的促进作用比AES好。

In order to investigate the effects of surfactant types on the formation of HCFC-141 b(CH3CCl2 F)hydrate,fatty alcohol polyoxyethylene ether(AEO-9),fatty alcohol polyoxyethylene ether sulfate(AES)and Tween80 were studied on the induction time,formation rate and cold storage of HCFC-141 b hydrate under static conditions.The results show that high subcooling degree can improve hydrate formation.The optimum addition amounts of AEO-9,AES and Tween80 were w=2.5%,0.1%and 2%,respectively.The corresponding HCFC-141 b hydrate formation induction times were 63,67 and 89 mins at 0.2℃,and the average cold storage capacity of HCFC-141b hydrate were 167.74,122.47 and 202.73 kJ·kg^-1,respectively.The average hydrate formation rates were 3.97,2.70 and 4.12 kJ·kg^-1 min^-1,respectively.AEO-9 is more beneficial for HCFC-141b hydrate nucleation,and Tween80 is more conducive to hydrate growth and cold storage density increase.The enhancement mechanism of nonionic surfactants AEO-9 and Tween80 are mainly by micelle formation,while that of the anionic surfactant AES is mainly by adsorption.AEO-9 and Tween80 have better performance than AES.