微通道内醇胺/离子液体复配水溶液吸收CO2的传质特性

doi:10.11949/0438-1157.20211767

化工学报 ›› 2022, Vol. 73 ›› Issue (5): 1930-1939.DOI: 10.11949/0438-1157.20211767

微通道内醇胺/离子液体复配水溶液吸收CO₂的传质特性

殷亚然¹(),朱星星¹,张先明¹,朱春英²,付涛涛²,马友光²()

^1.纺织纤维材料与加工技术国家地方联合工程实验室，浙江理工大学材料科学与工程学院，浙江杭州 310018
^2.化学工程联合国家重点实验室，天津大学化学工程学院，天津 300072

收稿日期:2021-12-14 修回日期:2022-03-02 出版日期:2022-05-05 发布日期:2022-05-24
通讯作者: 马友光
作者简介:殷亚然（1990—），女，博士，讲师，yryin@zstu.edu.cn
基金资助:
浙江省自然科学基金项目(LQ21B060009);国家自然科学基金项目(22008220);浙江理工大学科研业务费专项(2021Q014)

Mass transfer characteristics of CO₂ absorption in alkanolamine/ionic liquid hybrid aqueous solutions in a microchannel

Yaran YIN¹(),Xingxing ZHU¹,Xianming ZHANG¹,Chunying ZHU²,Taotao FU²,Youguang MA²()

^1.National Engineering Laboratory for Textile Fiber Materials and Processing Technology, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, Zhejiang, China
^2.State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Received:2021-12-14 Revised:2022-03-02 Online:2022-05-05 Published:2022-05-24
Contact: Youguang MA

摘要/Abstract

摘要：

研究了微通道内醇胺[单乙醇胺(MEA)和甲基二乙醇胺(MDEA)]与离子液体[1-丁基-3-甲基咪唑四氟硼酸([Bmim][BF₄])和1-羟乙基-3-甲基咪唑甘氨酸([C₂OHmim][GLY])]复配水溶液吸收CO₂的传质特性。考察了醇胺/离子液体浓度比(c_AA∶c_IL)对液相体积传质系数(k_La)的影响，发现k_La随反应速率的增大而增大。为进一步阐释复配水溶液吸收CO₂的传质机理，分析了比表面积、扩散速率、增强因子和液弹循环对传质速率的影响。结果表明，四种复配溶液中，反应速率和循环频率(f_cir)分别在低流率和高流率下对传质速率起主导作用。k_La可表示为f_cir的函数，低气相流率下k_La与f_cir呈线性关系，斜率与反应速率成正相关，高气相流率下，液弹循环因膜弹传递困难而对整体传质速率的影响减弱，k_La与f_cir呈指数关系，幂律指数小于1。

关键词: 微通道, 醇胺, 离子液体, 气液两相流, 传质

Abstract:

The absorption performance of CO₂ by blends of alkanolamines [monoethanolamine (MEA) and methyldiethanolamine (MDEA)] and ionic liquids [1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF₄]) and 1-hydroxyethyl-3-methylimidazolium glycine ([C₂OHmim][GLY])] was investigated in the microchannel. The influence of the concentration ratio of alkanolamine/ionic liquid (c_AA∶c_IL) on the liquid-phase volumetric mass transfer coefficient (k_La) was highlighted. The results show that k_La increases with the increase of reaction rate for all solutions. In order to further elucidate the mass transfer mechanism of CO₂ absorption by the compound aqueous solution, the effects of specific surface area, diffusion rate, enhancement factor and liquid-elastic circulation on the mass transfer rate were analyzed. The results show that the overall mass transfer rate is significantly controlled by chemical reaction rate at low flow rates, and by circulation frequency (f_cir) at high flow rates. Nevertheless, k_La can still be expressed as a mathematical function of f_cir. k_La is linearly related with f_cir at low gas flow rates, and the slope is positively related with the reaction rate. At high gas flow rates, the effect of circulation on mass transfer rate becomes weak due to the difficulty of film-slug exchange. In this case, k_La follows a power-law relation with f_cir whose exponent is less than 1.

Key words: microchannels, alkanolamine, ionic liquid, gas-liquid flow, mass transfer

中图分类号:

TQ 021.4

殷亚然, 朱星星, 张先明, 朱春英, 付涛涛, 马友光. 微通道内醇胺/离子液体复配水溶液吸收CO₂的传质特性[J]. 化工学报, 2022, 73(5): 1930-1939.

Yaran YIN, Xingxing ZHU, Xianming ZHANG, Chunying ZHU, Taotao FU, Youguang MA. Mass transfer characteristics of CO₂ absorption in alkanolamine/ionic liquid hybrid aqueous solutions in a microchannel[J]. CIESC Journal, 2022, 73(5): 1930-1939.

图/表 13

表1 醇胺/离子液体复配水溶液的物理性质

Table 1 Physical properties of various alkanolamine/ionic liquid aqueous solutions

溶液	c_AA∶c_IL	密度ρ_L/(g/cm³)	黏度η_L/(mPa·s)	表面张力σ/(mN/m)
MEA/[Bmim][BF₄]	5∶5	1.0169	1.000	37.84
	6∶4	1.0135	0.983	37.73
	7∶3	1.0100	0.962	37.40
	8∶2	1.0064	0.950	37.16
	9∶1	1.0029	0.934	36.82
	10∶0	0.9993	0.952	39.77
MEA/[C₂OHmim][GLY]	5∶5	1.0214	1.078	37.39
	6∶4	1.0170	1.041	37.90
	7∶3	1.0125	1.008	38.45
	8∶2	1.0082	0.964	38.95
	9∶1	1.0037	0.930	39.45
MDEA/[Bmim][BF₄]	5∶5	1.0187	1.045	35.76
	6∶4	1.0182	1.083	35.74
	7∶3	1.0155	1.105	35.71
	8∶2	1.0129	1.114	35.68
	9∶1	1.0101	1.141	35.63
	10∶0	1.0066	1.155	38.52
MDEA/[C₂OHmim][GLY]	5∶5	1.0254	1.216	37.95
	6∶4	1.0217	1.215	38.36
	7∶3	1.0185	1.213	39.15
	8∶2	1.0146	1.208	39.65
	9∶1	1.0110	1.201	40.44

图1 实验装置流程和微通道结构示意图

Fig.1 Schematic diagram of experimental device and microchannel structure

图2 气泡初始长度的稳定性分析

Fig.2 Stability analysis of initial bubble length

图3 微通道中气液弹状流示意图

Fig.3 Schematic of gas-liquid slug flow in the microchannel

图4 液相浓度比对液相体积传质系数（kLa）的影响

Fig.4 Effects of concentration ratio of alkanolamine to ionic liquid on the liquid-phase volumetric mass transfer coefficient (kLa)

图5 液相浓度比对比表面积的影响

Fig.5 Effect of concentration ratio of alkanolamine/ionic liquid on the specific surface area

图6 液相浓度比对气液两相流的影响

Fig.6 Effect of concentration ratio of alkanolamine/ionic liquid on the gas-liquid two-phase flow

图7 液相传质系数（kL）随气相流率的变化

Fig.7 Variation of the liquid-phase mass transfer coefficient (kL) with the gas flow rate

图8 液相浓度比对气泡初始长度和生成时间的影响

Fig.8 Effects of concentration ratio of alkanolamine to ionic liquid on the initial length and formation time of bubbles

图9 增强因子（E）随气相流率的变化

Fig.9 Variation of the enhancement factor (E) with the gas flow rate

图10 液相浓度比对循环频率的影响

Fig.10 Effect of concentration ratio of alkanolamine to ionic liquid on the circulation frequency

图11 循环频率与液相体积传质系数的关系

Fig.11 Relationship of liquid-phase volumetric mass transfer with circulation frequency in the slug

表2 不同复配溶液的拟合系数α和β

Table 2 Coefficients α and β for different alkanolamine/ionic liquid solutions

c_AA∶c_IL	MEA/ [Bmim][BF₄]		MEA/ [C₂OHmim][GLY]		MDEA/[Bmim][BF₄]		MDEA/ [C₂OHmim][GLY]
c_AA∶c_IL	α	β	α	β	α	β	α	β
5∶5	0.029	3.692	0.057	5.320	0.019	1.140	0.041	4.336
6∶4	0.034	3.740	0.059	5.111	0.017	1.692	0.041	3.561
7∶3	0.043	3.776	0.063	4.677	0.019	1.662	0.033	3.519
8∶2	0.047	3.636	0.058	4.917	0.022	1.306	0.031	3.067
9∶1	0.050	4.191	0.060	4.962	0.023	1.256	0.027	2.582
10∶0	0.059	4.292	0.059	4.292	0.022	1.459	0.020	1.693

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微通道内醇胺/离子液体复配水溶液吸收CO₂的传质特性

Mass transfer characteristics of CO₂ absorption in alkanolamine/ionic liquid hybrid aqueous solutions in a microchannel

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