Purification of methylal/methanol mixtures by pervaporation process using ZIF-8 doped PEI membrane

Abstract

In this study, pervaporation process is evaluated for the separation of methylal/methanol mixtures. Polyetherimide (PEI) polymer was chosen for the membrane preparation due to the affinity of the methanol. ZIF-8 was used as additive for the membrane. ZIF-8 doped PEI membrane was synthesized and characterized. The chemical bond structure, thermal strength and morphology of the membranes were analyzed by Fourier transform infrared spectroscopy (FTIR), Thermogravimetric Analysis (TGA) and Scanning Electron Microscopy (SEM), respectively. Separation performance of membranes were investigated in different operation temperatures, different feed methanol concentrations and different ZIF-8 loading ratios. Optimum operation conditions were determined as 20 °C of operation temperature and 6 wt. % of feed methanol concentration and 0.5 wt.% ZIF-8 loading ratio. Flux and methanol selectivity values were 0.57 kg/m2h and 8169, respectively.

Keywords

• Membrane
• Methylal
• Pervaporation
• Polyetherimide
• Membran
• Metilal
• Pervaporasyon
• Polieterimid

Metilal/metanol karışımlarının ZIF-8 katkılı PEI membran kullanarak pervaporasyon prosesi ile saflaştırılması

Abstract

Bu çalışmada, metilal/metanol karışımlarının ayrılması için pervaporasyon işlemi kullanılmıştır. Metanole afinitesinden dolayı membran hazırlamak için polieterimid (PEI) polimeri seçilmiştir. ZIF-8, membran için katkı maddesi olarak kullanılmıştır. ZIF-8 katkılı PEI membranı sentezlenmiş ve karakterize edilmiştir. Membranların kimyasal bağ yapısı, termal dayanımı ve morfolojisi sıraısyla Fourier dönüşümü kızılötesi spektroskopisi (FTIR), Termogravimetrik Analiz (TGA) ve Taramalı elektron mikroskobu (SEM) ile analiz edilmiştir. Membranların ayırma performansı farklı çalışma sıcaklıklarında, farklı besleme metanol konsantrasyonlarında ve farklı ZIF-8 yükleme oranlarında incelenmiştir. Optimum proses koşulları, 20°C operasyon sıcaklığı, ağırlıkça %6 besleme metanol konsantrasyonu ve ağırlıkça %0.5 ZIF-8 yükleme oranı olarak belirlenmiştir. Akı ve metanol seçicilik değerleri bu koşullar altında sırasıyla 0.57 kg/m2h akı ve 8169 metanol seçiciliği olarak belirlenmiştir.

Keywords

• Membran
• Metilal
• Pervaporasyon
• Polieterimid

References

1. Amirilargani M, Sadatnia B 2014. Poly(vinyl alcohol)/zeolitic imidazolate frameworks (ZIF-8) mixed matrix membranes for pervaporation dehydration of isopropanol. J. Membr. Sci. 469:1–10.
2. Ahmed SF, Debnath JC, Mehejabin F, Islam N, Tripura R, Mofijur M, Hoang AT, Rasul MG, Vo DVN 2023. Utilization of nanomaterials in accelerating the production process of sustainable biofuels. Sustain. Energy Technol. Assess. 55:102894.
3. Baker RW 2000. Encyclopedia of Separation Science. Germany: Academic Press, pp. 205.
4. Barankova E 2017. Synthesis of Thin Film Composite Metal-Organic Frameworks Membranes on Polymer Supports, King Abdullah University of Science and Technology, Doctor of Philosophy, Kingdom of Saudi Arabia.
5. Basile A, Figoli A, Khayet M. 2015. Pervaporation, Vapour Permeation and Membrane Distillation: Principles and Applications (1. Basım). UK:Woodhead Publishing.
6. Basile A, Marcello De Falco MD, Centi G, Iaquaniello G. 2016. Membrane Reactor Engineering: Applications for a Greener Process Industry, United Kingdom:Wiley.
7. Basu S, Balakrishnan M. 2017. Polyamide thin film composite membranes containing ZIF-8 for the separation of pharmaceutical compounds from aqueous streams. Sep. Purif. Technol. 179:118–125.
8. Carretier E, Moulin P, Beaujean M, Charbit F. 2003. Purification and dehydration of methylal by pervaporation. J. Membr. Sci. 217:159–171.

9. Chen BK, Su C, Tseng T, Tsay MC 2006. Preparation of Polyetherimide Nanocomposites with Improved Thermal, Mechanical and Dielectric Properties. Polym. Bull. 57:671-68.
10. Das S, Banthia AK, Adhikari B. 2007. Improved conversion to ethyl acetate through removal of water of esterification by membrane pervaporation. Indian J. Chem. Technol. 14:552-559.
11. Demirciyeva F 2006. Membran Yöntemi Kullanarak Metan-Karbondioksit Gaz Karışımından Metanın Ayrıştırılması. Ondokuz Mayıs Üniversitesi Fen Bilimleri Enstitüsü, Samsun.
12. Dong Y, Dai C, Lei Z 2018. Extractive distillation of methylal/methanol mixture using the mixture of dimethylformamide (DMF) and ionic liquid as entrainers. Fuel 216:503–512.
13. Gao R, Zhang Q, Lv R, Soyekwo F, Zhu A, Liu Q. 2017. Highly efficient polymer-MOF nanocomposite membrane for pervaporation separation of water/methanol/MTBE ternary mixture. Chem. Eng. Res. Des. 117: 688-697.
14. Gonçalves VLC, Pinto BP, Silva JC, Mota CJA 2008. Acetylation of glycerol catalyzed by different solid acids. Catal. Today, 133–135:673–677.
15. Guo WF, Chung TS, Matsuura T 2004. Pervaporation study on the dehydration of aqueous butanol solutions: a comparison of flux vs. permeance, separation factor vs. selectivity. J. Membr. Sci. 245:199–210.
16. Jalal TA, Bettahalli NMS, Le NL, Nunes SP 2015. Hydrophobic Hyflon AD/Poly(vinylidene fluoride) Membranes for Butanol Dehydration via Pervaporation. Ind. Eng. Chem. Res. 54:11180–11187.
17. Kittur AA, Jeevankumar BK, Kariduraganavar MY, College SDM 2013. Pervaporation separation of water-dioxane mixtures through poly (vinyl alcohol)-silicone based hybrid membranes. Int. J. Curr. Eng. Technol. 1:148–156.
18. Li J, Si X, Li X, Wang N, An Q, Ji S 2018. Preparation of acid-resistant PEI/SA composite membranes for the pervaporation dehydration of ethanol at low pH. Sep. Purif. Technol. 192:205–212.
19. Lu X, Ma J, Ji L, Huang Z 2007. Experimental Study on the Combustion Characteristics and Emissions of Biodiesel Fueled Compression Ignition Engines with Premixed Dimethoxymethane. Energ. Fuel. 21:3144–3150.
20. Mensitieri G, Scherillo G, Manna PL, Musto P 2019. Sorption Thermodynamics of CO2, H2O, and CH3OH in a Glassy Polyetherimide: A Molecular Perspective. Membranes. 9: 1-30.
21. Park KS, Ni Z, Cote AP, Choi JY, Huang R, Uribe-Romo FJ, Chae HK, OKeeffe M, Yaghi OM 2006. Exceptional chemical and thermal stability of zeolitic imidazolate frameworks. PNAS. 103:10186–10191.
22. Shi GM, Yang T, Chung TS 2012. Polybenzimidazole (PBI)/zeolitic imidazolate frameworks (ZIF-8) mixed matrix membranes for pervaporation dehydration of alcohols. J. Membr. Sci. 415–416:577-586.
23. Song Q, Nataraj SK, Roussenova MV, Tan JC, Hughes DJ, Li W, Bourgoin P, Alam MA, Cheetham AK, Muhtaseb SAA, Sivaniah E. 2012. Zeolitic imidazolate framework (ZIF-8) based polymer nanocomposite membranes for gas separation. Energy Environ. Sci. 8: 8359-8369.
24. Tsou CH, An QF, Lo SC, Guzman MD, Hung WS, Hu CC, Lai JY 2015. Effect of microstructure of graphene oxide fabricated through different self-assembly techniques on 1-butanol dehydration. J. Membr. Sci. 477:93–100.
25. Wasewar K, Patidar S, Agarwal VK 2009. Esterification of lactic acid with ethanol in a pervaporation reactor: modeling and performance study. Desalination 243:305–313.
26. Zhang S, Zou Y, Wei T, Mu C, Liu X, Tong Z 2017. Pervaporation dehydration of binary and ternary mixtures of n-butyl acetate, n-butanol and water using PVA-CS blended membranes. Sep. Purif. Technol. 173: 314–322.