Preparation of a swelling-resistant polyethyleneimine-based pervaporation membrane via surface gradient crosslinking for the separation of methanol/dimethyl carbonate

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2024-12-22 DOI:10.1016/j.seppur.2024.131231

Xiaoyan Leng, Wei Qin, Ning Guo, Xinliang Liu, Ming Wang, Yingfei Hou

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Abstract

Dimethyl carbonate (DMC) was widely used as an environmentally friendly organic compound. However, the production process of DMC generated a methanol (MeOH)/DMC azeotrope, which increased the separation cost. Pervaporation technology was considered a promising method for the separation of MeOH/DMC. Based on the polarity differences between MeOH and DMC, polyethyleneimine (PEI) with abundant polar groups ( Abstract Image

NH₂) was selected as the membrane material for the separation of MeOH/DMC. We enhanced the organic solvent swelling resistance of PEI through in situ growth of SiO₂ and surface gradient crosslinking modifications. The results demonstrated that both the in-situ growth of SiO₂ and the surface gradient crosslinking modification significantly improved the membrane’s resistance to organic solvent swelling. However, the surface gradient crosslinking was the primary factor contributing to the enhancement. The membrane performance is optimized by adjusting the PEI concentration, TEOS concentration, TEOS reaction time, TMC concentration, and TMC crosslinking time. The prepared membrane achieved a flux of 0.9 kg·m⁻²·h⁻¹, with a separation factor of 54, and maintained stable operation for 50 h.

Abstract Image

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碳酸二甲酯（DMC）作为一种环保型有机化合物被广泛使用。然而，DMC 的生产过程会产生甲醇（MeOH）/DMC 共沸物，从而增加了分离成本。渗透蒸发技术被认为是一种很有前景的 MeOH/DMC 分离方法。根据 MeOH 和 DMC 的极性差异，我们选择了极性基团（NH2）丰富的聚乙烯亚胺（PEI）作为分离 MeOH/DMC 的膜材料。我们通过原位生长 SiO2 和表面梯度交联改性增强了 PEI 的耐有机溶剂溶胀性。结果表明，SiO2 的原位生长和表面梯度交联改性都显著提高了膜的耐有机溶剂溶胀性。然而，表面梯度交联是提高性能的主要因素。通过调整 PEI 浓度、TEOS 浓度、TEOS 反应时间、TMC 浓度和 TMC 交联时间，优化了膜的性能。制备的膜通量达到 0.9 kg-m-2-h-1，分离因子为 54，并能稳定运行 50 h。

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.