Enhancement of Gas Separation Properties of Polyvinyltrimethylsilane by Low-Temperature Plasma Treatment for Carbon Dioxide Utilization in “Green Chemistry” Processesстатья
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Дата последнего поиска статьи во внешних источниках: 4 марта 2022 г.
Аннотация:The paper presents the results of applying the membrane gas separation technique to the recovery of CO2 and its subsequent utilization by converting into ammonium carbamate. One-sided surface modification of homogeneous polyvinyltrimethylsilane (PVTMS) films by treating in low-temperature air plasma for 30 and 60 s has been carried out. The transport and gas separation properties of the modified samples has been investigated, and values for the permeability and diffusion coefficients of CO2, N-2, and CH4 have been experimentally obtained. On the basis of the experimental data, the effective coefficients of gas solubility in the modified film have been determined. It has been found that by modification within 30 s, the CO2/N-2 and CO2/CH4 separation factors are increased by two and three times, respectively, relative to the initial values. To assess the possibility of using the new membranes, mathematical modeling of a single-step membrane process for the separation of biogas components under steady-state and non-steady-state has been carried out. It has been shown that the proposed membrane modification method makes it possible to significantly increase the performance of the membrane unit: for example, the recovery of CH4 under steady-state conditions is increased from 70 to 86%, and the CO2 content in the permeate increases from 68 to 82 mol %. The reaction of ammonium carbamate production from CO2 and ammonia in recycled vegetable oil as a solvent has been successfully conducted using the calculated characteristics of the membrane module based on modified PVTMS.