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首页> 外文期刊>International journal of sustainable engineering >Diffusion mechanism and effect of mass transfer limitation during the adsorption of CO_2 by polyaspartamide in a packed-bed unit
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Diffusion mechanism and effect of mass transfer limitation during the adsorption of CO_2 by polyaspartamide in a packed-bed unit

机译：填充床单元中聚天冬酰胺吸附CO_2的扩散机理及传质限制效应

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摘要

A systematic study of the diffusion mechanism and effect of mass transfer limitation during the adsorption of CO2 onto polyaspartamide is presented using a differential adsorption bed method, carried out in a 100 x 60 x 40 mm packed-bed adsorption unit. The rate-limiting step where mass transfer limitation is dominant was studied using diffusion models. It was observed that intraparticle diffusion mechanism is the major contributor to the resistance offered to the transport of gas molecule through polyaspartamide. The behaviour of polyaspartamide, based on the intraparticle diffusion rate parameter derived from the plots of CO2 adsorbed versus the square root of time, signified that the adsorption mechanism involved both film and intraparticle diffusion. The intraparticle diffusion parameter (kid) obtained was dependent on temperature as well as intraparticle convection effects and ranged from 1.24 x 10(-4) to 2.13 x 10(-4) ms(-1). The Biot number (Bi) values were all greater than 10 (ranged from 17.80 - 30.74), confirming that the intraparticle diffusion was the rate-limiting step and heat transfer is more by conduction from the gas film layer than convection within the pores of polyaspartamide. Results from this study provide an important basis for future scale-up and optimisation of CO2 capture process using polyaspartamide.
机译：在100 x 60 x 40 mm填充床吸附装置中，采用差分吸附床方法对CO2吸附在聚天冬酰胺上的扩散机理和传质限制的影响进行了系统的研究。使用扩散模型研究了传质限制​​占主导地位的限速步骤。观察到颗粒内扩散机制是提供阻力给通过聚天冬酰胺的气体分子运输的主要贡献。聚天冬酰胺的行为基于粒子内扩散速率参数而得，该参数是根据吸附的CO2与时间的平方根的关系图得出的，表明吸附机理涉及薄膜和粒子内扩散。获得的粒子内扩散参数（孩子）取决于温度以及粒子内对流效应，范围为1.24 x 10（-4）到2.13 x 10（-4）ms（-1）。毕奥数（Bi）值均大于10（范围为17.80-30.74），这证实了颗粒内扩散是限速步骤，并且热传递更多地是通过气体膜层的传导而不是聚天冬酰胺孔内的对流。 。这项研究的结果为将来扩大规模和优化使用聚天冬酰胺的CO2捕集工艺提供了重要基础。

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