Preparation and optimization of nanocomposite membranes for ethanol dehydration via pervaporation by using response surface methodology

IF 5.5 3区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2024-10-01 DOI:10.1016/j.jtice.2024.105790

Neda Ahadi , Omid Bakhtiari

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引用次数: 0

Abstract

Background

Alcohol dehydration using pervaporation, as a fast-developing process, requires more facilitation by improving their membrane performance.

Methods

Graphene oxide nanosheets (GONs) were incorporated into blend matrixes of chitosan (CS) and polyvinyl-alcohol (PVA) to prepare nanocomposite membranes (NCMs) for ethanol dehydration. The membranes' structure was evaluated using SEM and FTIR analysis and their dehydration performance was studied against membrane composition (GONs loading and the CS/PVA blending ratio) and operational variables (feed temperature and ethanol concentration) using response surface methodology.

Significant Findings

SEM images revealed GONs uniform dispersion within the membrane matrix and the FTIR results revealed the hydrogen bonds formation and minor changes after GONs incorporation. The optimum NCM was selected as 50 wt. % CS/PVA blended polymer matrix loaded by 4 wt. % GONs with permeation flux (PF) and separation factor (SF) were improved by 50 % and 5-fold, to 299 g/m²h and 1142. Its PF and SF reached 418 g/m²h (45 % increment) and 652 (30 % decrement) as its temperature elevated from 50 to 70 °C. These values were measured as 311 g/m²h (25 % decline) and 1106 (66 % improvement) by increasing the feed's ethanol content from 80 to 90 wt. %.

Abstract Image

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利用响应面方法制备和优化纳米复合膜，用于通过渗透蒸发进行乙醇脱水

方法将氧化石墨烯纳米片（GONs）加入壳聚糖（CS）和聚乙烯醇（PVA）的混合基质中，制备用于乙醇脱水的纳米复合膜（NCMs）。利用扫描电镜和傅立叶变换红外分析评估了膜的结构，并利用响应面方法研究了膜的脱水性能与膜组成（GONs 负载和 CS/PVA 混合比）和操作变量（进料温度和乙醇浓度）的关系。最佳 NCM 选定为 50 wt. % CS/PVA 混合聚合物基质，其中负载了 4 wt. % GONs，渗透通量（PF）和分离因子（SF）分别提高了 50 % 和 5 倍，达到 299 g/m2h 和 1142。当温度从 50 °C 升至 70 °C 时，其 PF 和 SF 分别达到 418 g/m2h（提高 45%）和 652（降低 30%）。当饲料中的乙醇含量从 80% 增加到 90% 时，这些值分别为 311 克/平方米小时（下降 25%）和 1106 克/平方米小时（提高 66%）。

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来源期刊

Journal of the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.