固定化碳酸酐酶在立式反应器催化吸收模拟烟气中CO2的实验研究

利用海藻酸钠包埋和戊二醛交联法固定碳酸酐酶,并在立式反应器进行了固定化酶吸收CO2的特性实验.实验结果表明:固定化酶的酶活力回收率是56.3%;固定化酶显著加快模拟烟气中CO2的吸收;载酶量小时,气体流量是影响吸收CO2效果的主要因素,气体流量增大,载酶量成为主要因素;气体流量增大,载酶量对反应终止p H的影响减小;载酶量增大,气体流量对反应终止p H的影响减小;气体流量增大,CO2吸收效率下降,载酶量提高,CO2吸收效率上升;气体流量为650 m L·min-1和载酶量为1 mg时,固定化酶催化吸收CO2效果显著;固定化酶具有较高的操作稳定性;SEM显示反应后的固定化酶表面出现大量形状不规则的小孔,空隙结构变得发达.

Catalytic absorption of CO2 in simulated flue gas by immobilized carbonic anhydrase in vertical reactor

The characteristic experiment in immobilizing carbonic anhydrase (CA) by embedment with sodium alginate and glutaraldehyde cross-linking method was conducted in vertical reactor. The results show that the activity recovery of immobilized CA is 56.3%. The immobilized CA could remarkably speed up the absorption of CO₂ from simulated flue gas. The gas flow is the main factor affecting CO₂ absorption with small enzyme loading while the enzyme loading becomes the main factor when gas flow increases. The load of enzyme has a decreasing influence on the pH of terminal reaction as the gas flow increases, and the gas flow also has a decreasing influence on the pH of terminal reaction when the enzyme load increases. Besides, the efficiency of CO₂ absorption declines with the increase of the gas flow while rises with the increase of the enzyme load. The catalytic absorption of CO₂ by immobilized CA is remarkable with the gas flow of 650 mL·min^-1 and the enzyme load of 1 mg. Furthermore, the immobilization of CA enhances operation stability. The surface of immobilized CA exhibits a large number of irregular shapes of holes with mature space structure through scanning electron microscope (SEM) observation.