P(MMA-TMPTA)基固态胺的制备及其CO2吸附性能
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中国石油大学(华东)材料科学与工程学院

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国家自然科学基金项目


Preparation and CO2 Adsorption Behavior of Amine-functionalized Porous P(MMA-TMPTA) Resin
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    摘要:

    以甲基丙烯酸甲酯(MMA)为单体,三羟甲基丙烷三丙烯酸酯(TMPTA)为交联剂,甲苯和乳化水为致孔剂,采用过硫酸铵-四甲基乙二胺氧化还原引发体系,通过悬浮聚合的方法制备了多孔共聚物P(MMA-TMPTA),简称PMT,然后通过浸渍法将经丙烯腈改性的四乙烯五胺(TEPA-AN,简称TN)负载到PMT的孔道内,得到固态胺吸附材料。利用扫描电子显微镜(SEM)、红外光谱分析(FTIR)、N2吸附-脱附等温线、热重分析(TG)、元素分析(EA)等方法表征了固态胺吸附材料的结构、形貌和稳定性等。研究了吸附温度、有机胺负载量、湿度等条件对此固态胺吸附剂吸附CO2的性能影响。研究结果表明:当吸附温度为25℃、TN负载量为60 wt%、CO2浓度为1(±0.1) vol%、流速为0.4 L/min时,此固态胺吸附材料对CO2的吸附量可达93.43 mg/g。水的存在能提升此固态胺吸附材料对CO2的吸附量,在湿度为50(±5) %的条件下,其对CO2的吸附量提升至105.30 mg/g。经过9次循环再生吸附后,其吸附量仍达初始吸附量的96.554%。上述的研究结果表明:此TN改性多孔PMT的固态胺吸附剂对CO2有优异的吸附量及选择吸附性,且再生性能稳定。通过动力学研究表明该吸附剂对CO2吸附为物理与化学吸附共同作用的结果。

    Abstract:

    A novel solid amine adsorbent was prepared by a suspension polymerization of methyl methacrylate (MMA) and trimethylolpropane triacrylate (TMPTA), followed by aminating with tetraethylenepentamine-acrylonitrile (TEPA-AN). The structure, morphology and stability of solid amine adsorption materials were characterized by using SEM, FTIR, nitrogen adsorption-desorption isotherm, thermogravimetric analysis (TG), elemental analysis (EA) and other methods. Factors that could determine the CO2 adsorption performance of the solid amine adsorbent, such as adsorption temperature, organic amine loading and humidity, were investigated. The results show that the maximum adsorption capacity of CO2 (93.43mg/g) was achieved at 25 °C with CO2 concentration of 1(±0.1) vol%, the flow rate of 0.4 L/min and 60% TEPA-AN load. The presence of water can increase the adsorption capacity of this solid amine adsorbent for CO2. Under the condition of humidity of 50(±5)%, the adsorption capacity of CO2 can be increased to 105.30mg/g. After 9 cycles of regeneration adsorption, the adsorbent still retained 96.554% of its initial adsorption capacity. The results show that the TEPA-AN modified porous P(MMA-TMPTA) solid amine adsorbent has stable regeneration performance, excellent adsorption capacity and selective adsorption for CO2.The kinetics study found that both physical adsorption and chemical adsorption were involved in CO2 adsorption.

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  • 收稿日期:2021-11-07
  • 最后修改日期:2022-02-23
  • 录用日期:2022-03-27
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