Formation and stability of HCFC–141b hydrate in organic phase change emulsion

doi:10.11949/j.issn.0438-1157.20181289

Abstract

Abstract:

To promote the hydrate formation, surfactants Tween 80 and Span 80 are added as emulsifiers in HCFC-141b, organic phase change materials (n-decanoic acid and dodecyl alcohol) and water system. Organic phase change material-surfactant-refrigerant aqueous emulsion is prepared by high-speed stirring. Emulsion increases the contact area of water and HCFC–141b. The effects of organic phase change materials and surfactants on the formation of hydrates are investigated experimentally under static conditions. The results show that emulsifier can effectively increase the cold storage capacity of hydrate, reduce the induction time of hydrate formation, and reduce the randomness of hydrate formation. The lower the temperature of emulsion systems, the better hydrate promotion effect. The hydrate formation/decomposition cycle experiments show that the emulsion system with Tween 80 has good stability, and the organic phase change emulsion improves the stability during the hydrate formation/decomposition cycle.

Key words: hydrate, surfactant, HCFC–141b, cold storage, phase change, emulsion, stability, induction time

摘要：

为了促进水合物形成，在HCFC–141b、有机相变材料（正癸酸和十二醇）和水体系中添加表面活性剂Tween 80和Span 80作为乳化剂，采用高速搅拌的方法制备了有机相变材料-表面活性剂-制冷剂-水乳液体系，增大水分子与制冷剂的接触面积。实验研究了静态条件下有机相变材料和表面活性剂添加量对水合物形成的影响。研究结果表明添加乳化剂可以有效提高水合物的蓄冷量，减少水合物形成诱导时间，降低水合物生成的随机性；温度越低，水合物促进效果越好。水合物生成/分解循环实验表明，添加Tween 80的乳液体系的稳定性好，有机相变乳液提高了水合物生成/分解循环过程的稳定性。

关键词: 水合物, 表面活性剂, HCFC–141b, 蓄冷, 相变, 乳液, 稳定性, 诱导时间

CLC Number:

TK 02

Linchen ZHOU, Zhigao SUN, Ling LU, Sai WANG, Juan LI, Cuimin LI. Formation and stability of HCFC–141b hydrate in organic phase change emulsion[J]. CIESC Journal, 2019, 70(5): 1674-1681.

周麟晨, 孙志高, 陆玲, 王赛, 李娟, 李翠敏. 有机相变乳液中HCFC–141b水合物生成及稳定性[J]. 化工学报, 2019, 70(5): 1674-1681.

Figures/Tables 9

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实验编号	添加剂/%(mass)	实验温度/℃
E1	1%CA–DE	0.2
E2	1%CA–DE+0.5%Tween 80	0.2
E3	1%CA–DE+1%Tween 80	0.2
E4	1%CA–DE+2%Tween 80	0.2
E5	1%CA–DE+3%Tween 80	0.2
E6	1%CA–DE+5%Tween 80	0.2
E7	2%CA–DE+1%Tween 80	0.2
E8	3%CA–DE+1%Tween 80	0.2
E9	1%CA–DE+0.1%Span 80	0.2
E10	1%CA–DE+0.5%Span 80	0.2
E11	1%CA-DE+1%Span 80	0.2
E12	1%CA–DE+1%Tween80+0.1%Span 80	0.2
E13	1%CA–DE+1%Tween80+0.5%Span 80	0.2
E14	1%CA–DE+1%Tween80+1%Span 80	0.2
E15	1%CA–DE+1%Tween 80	1
E16	1%CA–DE+1%Tween 80	3

实验编号	添加剂/%(mass)	实验温度/℃
E1	1%CA–DE	0.2
E2	1%CA–DE+0.5%Tween 80	0.2
E3	1%CA–DE+1%Tween 80	0.2
E4	1%CA–DE+2%Tween 80	0.2
E5	1%CA–DE+3%Tween 80	0.2
E6	1%CA–DE+5%Tween 80	0.2
E7	2%CA–DE+1%Tween 80	0.2
E8	3%CA–DE+1%Tween 80	0.2
E9	1%CA–DE+0.1%Span 80	0.2
E10	1%CA–DE+0.5%Span 80	0.2
E11	1%CA-DE+1%Span 80	0.2
E12	1%CA–DE+1%Tween80+0.1%Span 80	0.2
E13	1%CA–DE+1%Tween80+0.5%Span 80	0.2
E14	1%CA–DE+1%Tween80+1%Span 80	0.2
E15	1%CA–DE+1%Tween 80	1
E16	1%CA–DE+1%Tween 80	3

实验编号	实验温度/℃	诱导时间/min	平均诱导时间/min	诱导时间标准方差
E1	0.2	113,88,173	125	35.67
E2	0.2	28,42,121	64	40.94
E3	0.2	25,11,42	26	12.68
E4	0.2	71,150,201	141	53.48
E5	0.2	324,338,256	306	35.81
E6	0.2	467,621,436	508	80.90
E7	0.2	23,78,65	55	23.47
E8	0.2	115,116,76	102	18.62
E9	0.2	25,142,72	80	48.07
E10	0.2	45,17,56	39	16.42
E11	0.2	120,55,62	79	29.13
E12	0.2	40,69,76	62	15.58
E13	0.2	76,110,45	77	26.55
E14	0.2	26,158,254	146	93.47
E15	1	119,44,105	89	32.56
E16	3	127,212,312	217	75.61

实验编号	实验温度/℃	诱导时间/min	平均诱导时间/min	诱导时间标准方差
E1	0.2	113,88,173	125	35.67
E2	0.2	28,42,121	64	40.94
E3	0.2	25,11,42	26	12.68
E4	0.2	71,150,201	141	53.48
E5	0.2	324,338,256	306	35.81
E6	0.2	467,621,436	508	80.90
E7	0.2	23,78,65	55	23.47
E8	0.2	115,116,76	102	18.62
E9	0.2	25,142,72	80	48.07
E10	0.2	45,17,56	39	16.42
E11	0.2	120,55,62	79	29.13
E12	0.2	40,69,76	62	15.58
E13	0.2	76,110,45	77	26.55
E14	0.2	26,158,254	146	93.47
E15	1	119,44,105	89	32.56
E16	3	127,212,312	217	75.61

实验编号	结晶温度/℃
实验编号	第一次	第二次	第三次	第四次	第五次	第六次
E1	0.25	1.67	0.48	0.27	0.26	0.25
E3	0.25	4.49	4.26	4.17	3.65	3.82
E10	0.22	2.67	2.73	2.96	2.27	1.44
E12	0.24	3.73	3.70	3.62	3.45	2.96