静态条件下表面活性剂E-1310对HCFC-141b水合物生成的影响

Effect of surfactant E-1310 on the formation of HCFC-141b hydrate under static conditions

制冷剂水合物是一种理想的蓄冷工质,一氟二氯乙烷(HCFC-141b)水合物的蓄冷密度可达344 kJ/kg。静态系统中水合物难以成核,晶体生长速度慢,存在随机性等问题。为促进水合物形成,实验研究了环保型非离子表面活性剂异构十三醇聚氧乙烯醚(E-1310)的添加对HCFC-141b水合物生成的影响。研究结果表明,E-1310的添加可有效促进水合物形成,其促进效果与添加量有关。1.0%(质量)的E-1310是最佳添加量,此时的水合物形成诱导时间最短,水合物成核最稳定,水合物生长速率和蓄冷量均达到最大值,降低或提高E-1310的添加量都不能进一步促进水合物生成。E-1310非离子表面活性剂对水合物生成的促进机理主要是胶束效应。

Refrigerant hydrate is an ideal cold storage medium,and the cold storage density of 1,1-dichloro-1-fluoroethane(HCFC-141b)hydrate can reach 344 kJ/kg.There are some problems for hydrate formation in static systems,such as difficult to nucleate,slow crystal growth rate,and the randomness of nycleation.In order to promote the formation of hydrate,the effect of isotriosanol polyoxyethylene ether(E-1310),an environmentally friendly nonionic surfactant,on the formation of HCFC-141b hydrate was studied experimentally.The experimental results show that the addition of E-1310 can effectively promote hydrate formation,and the promotion effect is related to the addition amount.It is found that 1.0%(mass)E-1310 is the best addition mass fraction.The induction time of hydrate formation is the shortest,hydrate nucleation is the most stable,and the growth rate and cold storage capacity of hydrate reached the maximum with 1.0%(mass)E-1310 addition.Decreasing or increasing the addition amount of E-1310 cannot further improve the effect of hydrate formation promotion.The micellar effect is the main promoting mechanism of non-ionic surfactant E-1310 on hydrate formation.