Promotion on the formation of HCFC-141b hydrate under static conditions by surfactant OP-13

doi:10.16085/j.issn.1000-6613.2022-1428

Abstract

Abstract:

In order to promote the formation of HCFC-141b hydrate under static conditions, the condensate surfactant OP-13 of octylphenol and ethylene oxide was chosen to study its effect on the formation of HCFC-141b hydrate. Stable HCFC-141b-water emulsion can be prepared by adding OP-13. The experimental results showed that adding of OP-13 can significantly shorten the induction time of HCFC-141b hydrate formation. When OP-13 with mass fraction of 1% was added, the average induction time of HCFC-141b hydrate formation was the shortest, about 96min. The mass fraction of OP-13 affected the cold storage capacity of HCFC-141b hydrate. When 0.5% or 1% OP-13 was added, the cold storage capacity of HCFC-141b hydrate was bigger, which was 247.57kJ/kg and 248.42kJ/kg, respectively. Considering the induction time and cold storage capacity of hydrate formation, 1% OP-13 was the best addition. The experimental results also showed that HCFC-141b hydrate nucleation was random, and the addition of OP-13 stabilized hydrate nucleation. The surfactant OP-13 promoted hydrate formation mainly due to its micelles. Hydrate can form rapidly and stably due to the "memory" effect during hydrate formation/dissociation.

Key words: hydrate, induction time, HCFC-141b, cold storage, cyclic stability, surfactants, emulsions

摘要：

为了促进静态条件下HCFC-141b水合物的生成，选择辛基酚与环氧乙烷的缩合物表面活性剂OP-13来研究其对HCFC-141b水合物生成效果的影响。OP-13促进HCFC-141b分散在水中，形成稳定的乳液。研究结果表明，添加适量的OP-13可大幅度缩短HCFC-141b水合物形成的诱导时间。添加质量分数1%的OP-13，HCFC-141b水合物生成的平均诱导时间最短，约为96min。OP-13的添加会影响HCFC-141b水合物的蓄冷量，当添加0.5%和1%的OP-13时，HCFC-141b水合物的蓄冷量较大，分别为247.57kJ/kg和248.42kJ/kg。综合水合物生成的诱导时间和蓄冷量，1%的OP-13为最佳添加量。研究结果也表明HCFC-141b水合物成核具有随机性，OP-13的添加稳定了水合物成核；表面活性剂OP-13促进水合物形成主要是由于其形成的胶束。水合物形成/分解循环实验过程中由于“记忆”效应，水合物可快速稳定形成。

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

CLC Number:

TK02

YANG Yang, SUN Zhigao, LI Cuimin, LI Juan, HUANG Haifeng. Promotion on the formation of HCFC-141b hydrate under static conditions by surfactant OP-13[J]. Chemical Industry and Engineering Progress, 2023, 42(6): 2854-2859.

杨扬, 孙志高, 李翠敏, 李娟, 黄海峰. 静态条件下表面活性剂OP-13促进HCFC-141b水合物生成[J]. 化工进展, 2023, 42(6): 2854-2859.

Figures/Tables 11

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OP-13质量分数/%	诱导时间/min	平均诱导时间/min	诱导时间方差	形成持续时间/min	平均持续时间/min
0.5	129,157,79,69,193	125	42.65	41,44,50,56,49	48
1.0	70,80,109,117,104	96	16.36	53,42,44,45,38	44
1.5	133,142,110,146,189	144	23.48	43,44,50,45,45	45
2.0	204,235,186,162,195	196	21.76	42,54,41,49,42	46
2.5	201,351,198,428,284	292	80.78	36,64,40,47,43	46

OP-13质量分数/%	诱导时间/min	平均诱导时间/min	诱导时间方差	形成持续时间/min	平均持续时间/min
0.5	129,157,79,69,193	125	42.65	41,44,50,56,49	48
1.0	70,80,109,117,104	96	16.36	53,42,44,45,38	44
1.5	133,142,110,146,189	144	23.48	43,44,50,45,45	45
2.0	204,235,186,162,195	196	21.76	42,54,41,49,42	46
2.5	201,351,198,428,284	292	80.78	36,64,40,47,43	46

项目	实验1	实验2	实验3
冰质量/g	9.98	10.02	10.01
冰融化前后的温度/℃	-4.9/21.3	-4.7/18.2	-4.7/16.6
温水质量/g	239.47	215.88	208.21
温水放热前/后的温度/℃	26.4/21.3	23.6/18.2	22.0/16.6
冰蓄冷密度/kJ·kg^-1	327.05	326.48	321.23
相对误差/%	-2.4	-2.5	-4.1

项目	实验1	实验2	实验3
冰质量/g	9.98	10.02	10.01
冰融化前后的温度/℃	-4.9/21.3	-4.7/18.2	-4.7/16.6
温水质量/g	239.47	215.88	208.21
温水放热前/后的温度/℃	26.4/21.3	23.6/18.2	22.0/16.6
冰蓄冷密度/kJ·kg^-1	327.05	326.48	321.23
相对误差/%	-2.4	-2.5	-4.1

OP-13质量分数/%	实验1	实验2	实验3	平均值
0.5	246.68	240.72	255.21	247.54
1.0	250.42	243.35	251.49	248.42
1.5	234.82	238.03	230.47	234.44
2.0	235.21	225.54	229.80	230.18
2.5	223.53	215.34	210.40	216.42