Study on the capture of low pressure SO2 by imidazole-based ternary deep eutectic solvents

doi:10.11949/0438-1157.20191266

Abstract

Abstract:

In recent years, DESs, which is composed of hydrogen bond acceptor (HBA) and hydrogen bond donor (HBD), is considered as a potential SO₂ adsorbent due to its properties similar to ionic liquids. To prepare the DESs with large absorption capacity for low pressure SO₂, reasonable price and good recycling performance, three ternary functionalized DESs of CC-Gly-Im, CC-PEG200-Im, CC-EG-Im were developed using choline chloride (CC) as HBA, imidazole (Im) as functional component, and cheap glycerol (Gly), PEG200, ethylene glycol (EG) as second HBD. The obtained DESs were further applied for experimental study for low pressure SO₂, focusing on the type of second HBD, the content of imidazole, and temperature on the absorption performance of SO₂. The results showed that PEG200 demonstrated the best property, and its DESs possessed moderate density and viscosity, satisfactory thermal stability and absorption capacity. The maximum absorption of CC-PEG200-Im (1∶2∶7) DESs for 1% SO₂at 40℃ reached 0.236 g SO₂/g DES. The DESs presented stable absorption performance for SO₂ after five absorption-desorption cycles. The CC-PEG200-Im could absorb SO₂ by chemical interactions at the experimental conditions under ¹H NMR spectrum investigation.

Key words: sulfur dioxide, deep eutectic solvent, absorption, functionalized

摘要：

近几年来，以氢键受体（HBA）和氢键供体（HBD）组成的低共熔溶剂（DESs）以其类似于离子液体的性质被认为是一种有潜力的SO₂吸附剂。为制备用于低压SO₂吸收的容量大、价格合理、循环性能好的低共熔溶剂，选用咪唑(Im)作为功能化组分，以价格低廉的甘油(Gly)、PEG200和乙二醇(EG)作为第二HBD，与作为HBA的氯化胆碱(CC)构建CC-GIy-Im、CC-PEG200-Im、CC-EG-Im三元功能化低共熔溶剂，并用于低压SO₂的捕集实验研究。着重考察了第二HBD种类、咪唑含量、温度等因素对DESs吸收SO₂的性能影响。结果表明：在所选的第二HBD中，PEG200的性能最佳，其构建的低共熔溶剂密度、黏度适中，热稳定性好，吸收性好；CC-PEG200-Im（1∶2∶7）在40℃下，对1% SO₂的吸收量达到0.236 g SO₂/g DES；经5次吸收-解吸循环后，低共熔溶剂吸收性能仍然稳定；¹H NMR谱图分析结果表明，CC-PEG200-Im对SO₂的吸收机理为化学吸收。

关键词: 二氧化硫, 低共熔溶剂, 吸收, 功能化

CLC Number:

TQ 028.8

Xiaoxia DENG, Lei GONG, Xiaobang LIU, Dongshun DENG. Study on the capture of low pressure SO₂ by imidazole-based ternary deep eutectic solvents[J]. CIESC Journal, 2020, 71(1): 368-375.

邓晓霞, 龚磊, 刘小棒, 邓东顺. 咪唑类三元低共熔溶剂捕集低压SO₂的实验研究[J]. 化工学报, 2020, 71(1): 368-375.

Figures/Tables 11

Fig.1 Density of three DESs at different temperatures

Fig.2 Viscosity of three DESs at different temperatures

Fig.3 TGA curves of three DESs

Fig.4 Absorption profiles of three DESs at 40℃ for 1%SO2

Fig.5 Absorption profiles of CC-PEG200-Im DESs with various proportion at 40℃ for 1%SO2

Fig.6 Absorption profiles of CC-PEG200-Im DESs with various proportion at 40℃ for 0.33% SO2

Fig.7 Absorption profiles of CC-PEG200-Im (1∶2∶3) DESs for 1%SO2 at different temperatures

Table 1 Comparison of absorption capacity between present DESs and other DESs from literatures under low pressure SO2

DESs (摩尔比)	温度/℃	SO₂浓度或分压	吸收容量/ (g SO₂/g DES)	文献
CC-PEG200-Im (1∶2∶7)	40	1%	0.236	本研究
CC-PEG200-Im (1∶2∶5)	40	0.33%	0.140	本研究
CC-Gly (1∶1)	20	0.01 MPa	0.153	[10]
CC-EG (1∶2)	30	0.02 MPa	0.158	[12]
Im-Gly (1∶2)	40	0.2%	0.161	[15]
乙烯脲- 1-丁基-3-甲基咪唑氯盐 (1∶2)	20	2%	0.250	[25]
L-卡尼丁-EG (1∶3)	40	2%	0.151	[26]
L-卡尼丁-EG (1∶3)	40	0.37%	0.119	[26]
1-乙基-3-甲基咪唑氯盐-丁二腈 (1∶1)	20	0.2%	0.120	[27]
1-丁基-3-甲基咪唑氯盐-4-甲基咪唑 (1∶2)	20	0.1%	0.189	[28]

Fig.8 SO2 absorption and desorption by CC-PEG200-Im (1∶2∶3) for 5 cycles

Fig.9 1H NMR spectra of fresh and SO2-saturated CC-PEG200-Im (1∶2∶3)

Fig.10 Proposed chemical mechanism between CC-PEG200-Im (1∶2∶3) and SO2

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Study on the capture of low pressure SO₂ by imidazole-based ternary deep eutectic solvents

咪唑类三元低共熔溶剂捕集低压SO₂的实验研究

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Figures/Tables 11

References 28

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