《厦门大学学报（自然科学版）》

针对目前聚离子液体存在的对CO2的吸收量低且吸收和解吸速率慢等问题,采用交联剂并分别结合不同干燥方法(冷冻干燥、超临界CO2干燥、普通干燥)合成了一种交联型季铵盐类聚离子液体,进而采用高压石英弹簧法测定其对CO2的吸收能力.研究结果表明,采用冷冻干燥法制得的聚离子液体相对结晶度低,具有较高的CO2吸收量,在298.2 K、0.21 MPa下对CO2的吸收量最高达0.024 g/g,而在5.0 MPa下高达0.127 g/g.在298.2 K下5.0 MPa的高压合成气(H2/CO/CO2)中对CO2的变压吸收分离结果显示,该聚离子液体具有性能稳定、吸收和解吸速率快及对CO2选择性高等优点.

Carbon dioxide(CO2)capture has attracted extensive attention in recent years.Among the various capture media, polymeric ionic liquids(PILs)have caused concern for its better CO2 absorption and desorption capacity.However,the CO2 absorption in PILs is still relatively low in the literature reported.In this work,a quaternary ammonium based crosslinked PIL was synthesized and dried by different drying methods,and the high-pressure quartz spring method was employed to study its absorption of CO2.Results showed that the crosslinked PIL from freeze dryinghad low crystallinityand high CO2 absorption, and its CO2 absorptionwas 0.024 g/g at 298.2 K and 0.21 MPa,while it was up to 0.127 g/g at 298.2 K and 5.0 MPa.At 298.2 K and 5.0 MPa,the pressure swing absorption process was implemented for separation of CO2 from the high-pressure syngas system,revealing efficient separation of CO2 from H2/CO/CO2.And the crosslinked PIL also showed its excellent stability,fast absorption and desorption rate and high selectivity for CO2.

引言
1 实验部分
2 结果与讨论
3 结论

图1 EDMA-clPBACl的合成<br/>Fig.1 Synthesis of EDMA-clPBACl

图1 EDMA-clPBACl的合成
Fig.1 Synthesis of EDMA-clPBACl

图2 不同原料质量比下EDMA-clPBACl的IR谱图<br/>Fig.2 IR spectra of EDMA-clPBACl with different mass ratios of raw materials

图2 不同原料质量比下EDMA-clPBACl的IR谱图
Fig.2 IR spectra of EDMA-clPBACl with different mass ratios of raw materials

图3 EDMA-clPBACl的EDS谱图<br/>Fig.3 EDS spectrum of EDMA-clPBACl

图3 EDMA-clPBACl的EDS谱图
Fig.3 EDS spectrum of EDMA-clPBACl

表1 交联剂用量对EDMA-clPBACl-FD孔结构的影响<br/>Tab.1 The effect of amount of crosslinking agents on pore structure of EDMA-clPBACl-FD

表1 交联剂用量对EDMA-clPBACl-FD孔结构的影响
Tab.1 The effect of amount of crosslinking agents on pore structure of EDMA-clPBACl-FD

图4 不同干燥方式得到的EDMA-clPBACl的XRD谱图<br/>Fig.4 XRD spectra of EDMA-clPBACl obtained by different drying methods

图4 不同干燥方式得到的EDMA-clPBACl的XRD谱图
Fig.4 XRD spectra of EDMA-clPBACl obtained by different drying methods

图5 不同干燥方式得到的EDMA-clPBACl的DSC谱图<br/>Fig.5 DSC spectra of EDMA-clPBACl obtainedby different drying methods

图5 不同干燥方式得到的EDMA-clPBACl的DSC谱图
Fig.5 DSC spectra of EDMA-clPBACl obtainedby different drying methods

图6 不同干燥方式对CO2吸收量的影响<br/>Fig.6 The effect of different drying methods on CO2 absorption

图6 不同干燥方式对CO2吸收量的影响
Fig.6 The effect of different drying methods on CO2 absorption

图7 不同干燥方式得到的聚离子液体形貌图<br/>Fig.7 The morphology of polymeric ionic liquids obtained by different drying methods

图7 不同干燥方式得到的聚离子液体形貌图
Fig.7 The morphology of polymeric ionic liquids obtained by different drying methods

图8 交联剂用量对CO2吸收量的影响<br/>Fig.8 The effect of amount of crosslinking agents on CO2 absorption

图8 交联剂用量对CO2吸收量的影响
Fig.8 The effect of amount of crosslinking agents on CO2 absorption

图9 温度对CO2吸收量的影响<br/>Fig.9 The effect of temperature on CO2 absorption

图9 温度对CO2吸收量的影响
Fig.9 The effect of temperature on CO2 absorption

图10 含水量对CO2吸收量的影响<br/>Fig.10 The effect of water content on CO2 absorption

图10 含水量对CO2吸收量的影响
Fig.10 The effect of water content on CO2 absorption

图11 EDMA-clPBACl-FD对CO2的吸收-解吸曲线<br/>Fig.11 CO2 absorption-desorption curvewith EDMA-clPBACl-FD

图11 EDMA-clPBACl-FD对CO2的吸收-解吸曲线
Fig.11 CO2 absorption-desorption curvewith EDMA-clPBACl-FD

图12 298.2 K下从高压合成气中变压吸收分离CO2的效果<br/>Fig.12 Results of pressure swing absorption for CO2 separation from high pressure syngas at 298.2 K

图12 298.2 K下从高压合成气中变压吸收分离CO2的效果
Fig.12 Results of pressure swing absorption for CO2 separation from high pressure syngas at 298.2 K

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备注

引言

1 实验部分

2 结果与讨论

3 结论

学报简介

备注

引言

1 实验部分

2 结果与讨论

3 结 论

学报简介

3 结论