PDF(Pubmed)
Abstract：
This article provides a comprehensive review of the state-of-the-art technology of polymeric mixed-matrix membranes for CO2/CH4 separation that can be applied in medium, small, and domestic biogas systems operating at low pressures (0.2-6 kPa). Critical data from the latest publications of CO2/CH4 separation membranes were analyzed, considering the ratio of CO2/CH4 permeabilities, the CO2 selectivity, the operating pressures at which the membranes were tested, the chemistry of the polymers studied and their gas separation mechanisms. And the different nanomaterials as fillers. The intrinsic microporous polymers (PIMs) were identified as potential candidates for biomethane purification due to their high permeability and selectivity, which are compatible with operation pressures below 1 bar, and as low as 0.2 bar. This scenario contrasts with other polymers that require pressures above 1 bar for operation, with some reaching 20 bar. Furthermore, the combination of PIM with GO in MMMs was found to not influence the permeability significantly, but to contribute to the membrane stability over time, by preventing the structural collapse of the membrane caused by aging. The systematic analysis here presented is a valuable resource for defining the future technological development of CO2/CH4 separation membranes for biogas biorefining.
摘要：
本文全面综述了用于CO2/CH4分离的聚合物混合基质膜的最新技术，该技术可应用于介质中，小,以及在低压（0.2-6kPa）下运行的家用沼气系统。分析了CO2/CH4分离膜最新出版物的关键数据，考虑到CO2/CH4渗透率的比率，二氧化碳的选择性，测试膜的操作压力，所研究的聚合物的化学性质及其气体分离机理。和不同的纳米材料作为填料。固有微孔聚合物（PIMs）由于其高渗透性和选择性而被确定为生物甲烷纯化的潜在候选物。与低于1bar的操作压力兼容，低至0.2bar。这种情况与其他需要1巴以上压力进行操作的聚合物形成对比，有些达到20巴。此外，发现在MMM中PIM与GO的组合不会显着影响渗透率，但是随着时间的推移有助于膜的稳定性，通过防止老化引起的膜结构崩溃。这里提出的系统分析是定义用于沼气生物精炼的CO2/CH4分离膜的未来技术发展的宝贵资源。
