聚乙二醇改性醋酸纤维素膜用于高效烯烃/石蜡分离,Energy & Fuels

当前位置： X-MOL 学术 › Energy Fuels › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

聚乙二醇改性醋酸纤维素膜用于高效烯烃/石蜡分离
Energy & Fuels ( IF 5.2 ) Pub Date : 2022-08-23 , DOI: 10.1021/acs.energyfuels.2c01768
Mohammadreza Doosti ₁ , Reza Abedini ₁

Affiliation

烯烃/石蜡分离是气体分离领域最具挑战性的工艺之一。如今，膜技术已成为当前能源密集型低温蒸馏的有前途的替代方案。由于玻璃态聚合物的选择性较高，因此这些聚合物在这方面是优选的。在此，聚乙二醇 (PEG) 被称为增塑剂，用于与玻璃状醋酸纤维素 (CA) 混合，并提高其对乙烯和丙烯的渗透性和分离系数。使用傅里叶变换红外分析证明了 CA 和 PEG 的所有特定波段的存在。玻璃化转变温度的变化 ( T _g) 通过差示扫描量热分析研究了膜的 )，证实实现了均匀混合。添加高达 30 wt % 的 PEG，T _g并且膜的结晶度也降低了。扫描电子显微镜结果表明原始膜具有均匀致密的结构，由于产生的分子间相互作用，在添加 PEG 后其变为凹槽结构。气体分离测试表明，在 2 bar 压力下向聚合物基质中添加不同量的 PEG 后，所有共混膜的气体分离性能都有所提高。乙烯渗透率显示从纯 CA 中的 0.59 到 CA/30 wt% PEG 膜中的 0.92 Barrer 增加了 56%。丙烯渗透率也有类似的提高，从 0.57 增加到 0.91 Barrer。向聚合物基质中添加 PEG 将乙烯/乙烷的选择性从原始膜的 2.185 提高到 30 wt% PEG 膜的 2.484。而且，丙烯/丙烷的选择性从 2.375 增加到 3.033。所有混合膜的气体分离性能也随着所有膜中的进料压力的增加而提高。在 10 bar 的压力下，乙烯/乙烷的选择性从 2.48 提高到 2.57，丙烯/丙烷的选择性从 3.033 提高到 3.52。

"点击查看英文标题和摘要"

Polyethyleneglycol-Modified Cellulose Acetate Membrane for Efficient Olefin/Paraffin Separation

Olefin/paraffin separation is one of the most challenging processes in the gas separation field. Nowadays, membrane technology has emerged as a promising alternative for the current energy-intensive cryogenic distillation. Due to the demonstration of higher selectivity of glassy polymers, these polymers are preferred in this regard. Herein, polyethylene glycol (PEG), known as a plasticizer, was used to blend with glassy cellulose acetate (CA) and enhanced its permeability and separation factor over ethylene and propylene. The existence of all specific bands for CA and PEG was proved using Fourier transform infrared analysis. Changes in the glass-transition temperature (T_g) of the membrane were investigated through differential scanning calorimetry analysis, which confirmed that a uniform blending was attained. With the addition of PEG up to 30 wt %, T_g and crystallinity of the membranes also decreased. The scanning electron microscopy results indicated a uniform dense structure for the pristine membrane, which changed into a grooved structure upon addition of PEG due to the created intermolecular interaction. The gas separation test indicated that upon addition of different amounts of PEG to the polymer matrix at 2 bar pressure, the gas separation performance of all the blended membranes improved. Ethylene permeability showed 56% increase from 0.59 in neat CA to 0.92 Barrer in a CA/30 wt % PEG membrane. A similar enhancement was also seen in propylene permeability, which increased from 0.57 to 0.91 Barrer. Addition of PEG into the polymer matrix increased the selectivity of ethylene/ethane from 2.185 for the pristine membrane to 2.484 for the 30 wt % PEG membrane. Moreover, the selectivity of propylene/propane increased from 2.375 to 3.033. The gas separation performance of all the blended membranes also enhanced upon increasing the feed pressure in all membranes. The selectivity of ethylene/ethane enhanced from 2.48 to 2.57 and that of propylene/propane increased from 3.033 to 3.52 at a pressure of 10 bar.

更新日期：2022-08-23

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南