Polyvinyl pyrrolidone-chitosan blend membrane for pervaporation separation of trimethyl boratemethanol mixture

IF 2.8 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal Pub Date : 2025-04-16 DOI:10.1007/s13726-025-01489-9

Mehtap Ozekmekci, Mehmet Copur, Derya Unlu

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Abstract

Trimethyl borate (TMB) is an essential chemical for applications ranging from organic synthesis to borohydride production and requires efficient separation from methanol for optimal utilization. This study investigates the pervaporation performance of blend membranes composed of different ratios of chitosan (CS) and polyvinyl pyrrolidone (PVP) to improve the separation of TMB/methanol mixtures through pervaporation. The structural morphology, thermal properties, and crystalline nature of these membranes were comprehensively characterized using Fourier transform infrared spectroscopy, thermogravimetric analysis, contact angle measurements, scanning electron microscopy, and X-ray diffraction analysis. Pervaporation experiments were conducted by varying feed compositions, operating temperatures, and PVP ratios. The results demonstrated that increasing PVP content has a significant effect on permeation flux. The best conditions were obtained at 45 °C of operation temperature and 75% (by wt) TMB-25% (by wt) methanol mixture by utilizing a PVP-CS-2 membrane, recording flux value of 335.44 g/m² h. Additionally, PVP-CS-1 and PVP-CS-2 blend membranes were subjected to a crosslinking process to evaluate their separation performance. The crosslinked PVP-CS-1 membrane showed a good performance, with a selectivity value of 146.37. Additionally, the crosslinked PVP-CS-2 membrane exhibited remarkable stability 5 run experiments, indicating strong chemical and mechanical endurance.

Graphical abstract

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聚乙烯吡咯烷酮-壳聚糖共混膜渗透汽化分离硼三甲基乙醇混合物

三甲基硼酸盐（TMB）是从有机合成到硼氢化物生产的重要化学品，需要从甲醇中有效分离以获得最佳利用。本研究考察了壳聚糖（CS）和聚乙烯吡罗烷酮（PVP）的不同配比组成的共混膜的渗透汽化性能，通过渗透汽化提高TMB/甲醇混合物的分离效果。利用傅里叶变换红外光谱、热重分析、接触角测量、扫描电子显微镜和x射线衍射分析对这些膜的结构形态、热性能和晶体性质进行了全面表征。通过不同的饲料组成、操作温度和PVP比例进行渗透蒸发实验。结果表明，PVP含量的增加对渗透通量有显著影响。最佳分离条件为：45℃操作温度，75% (wt) TMB-25% （wt）甲醇混合物，记录通量值为335.44 g/m2 h。此外，对PVP-CS-1和PVP-CS-2共混膜进行交联处理，以评估其分离性能。交联的PVP-CS-1膜性能良好，选择性值为146.37。此外，交联的PVP-CS-2膜在5次实验中表现出显著的稳定性，具有较强的化学和机械耐久性。图形抽象

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来源期刊

Iranian Polymer Journal 化学-高分子科学

CiteScore

4.90

自引率

9.70%

发文量

107

审稿时长

2.8 months

期刊介绍： Iranian Polymer Journal, a monthly peer-reviewed international journal, provides a continuous forum for the dissemination of the original research and latest advances made in science and technology of polymers, covering diverse areas of polymer synthesis, characterization, polymer physics, rubber, plastics and composites, processing and engineering, biopolymers, drug delivery systems and natural polymers to meet specific applications. Also contributions from nano-related fields are regarded especially important for its versatility in modern scientific development.