In amine‐based CO₂ capture processes, aqueous amine solvent is circulated between absorber (CO₂ absorption) and stripping (solvent regeneration) columns. To reduce solvent regeneration energy demand, a selective membrane can dewater and enrich the CO₂ concentration in solution prior to the stripper, lowering steam requirements for solution heating. In this work, a facile synthesis strategy was developed to prepare faujasite (FAU) zeolite membranes built upon polydopamine (PDA) modified α‐Al₂O₃ substrates. PDA facilitated the attachment of zeolite phases onto the substrate surface to form a 3 μm membrane layer. Membrane permeation flux of 4.45 kg m⁻² h⁻¹ and 95% rejection rate calculated by either CO₂ loading or total alkalinity was achieved in dewatering of CO₂ loaded 30 wt% monoethanolamine (MEA) solution. The effects of temperature on membrane dewatering performance and stability were investigated. This study highlights the potential for process integration of membrane technology in amine‐based post‐combustion CO₂ capture operations.

中文翻译：

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用于胺基燃烧后二氧化碳捕集溶液脱水的FAU沸石膜

在基于胺的CO ₂捕获过程中，胺水溶液在吸收塔（CO ₂吸收）和汽提塔（溶剂再生）之间循环。为了减少对溶剂再生能量的需求，选择性膜可以在汽提器之前对溶液中的CO ₂进行脱水和浓缩，从而降低了溶液加热所需的蒸汽量。在这项工作中，一个浅显的合成策略的开发是为了制备八面沸石（FAU）在聚多巴胺内置（PDA）改性α-Al系沸石膜₂ ö _3个基材。PDA有助于将沸石相附着到基材表面上，形成3μm的膜层。膜通量为4.45 kg m ^-2 h ^-1在负载了CO _2的30 wt％单乙醇胺（MEA）溶液中脱水后，通过负载CO ₂或总碱度计算出的废品率达到了95％。研究了温度对膜脱水性能和稳定性的影响。这项研究强调了膜技术在胺基燃烧后CO ₂捕集作业中工艺集成的潜力。