Enhanced CO2 Separation Using Pebax Membrane Modified with Ethylene Glycol Monophenyl Ether

Document Type : Original Article

Authors
Mahdi Elyasi Kojabad 1
Parya Amirabedi 1
Masoud Dorfeshan 2
1 Assistant professor, Department of Chemical Engineering, Faculty of Engineering, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran
2 Assistant professor, Department of Mechanical Engineering, Faculty of Engineering, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran
20.1001.1/jgt.2025.2048620.1049
Abstract
CO2 separation is one of the main challenges of today's world due to the growth of industries. Membrane separation method is a promising method for CO2 separation, and poly(ether-block-amide) (Pebax) polymer membrane is one of the industrial membranes in this regard. However, this membrane is limited by the permeability-selectivity trade-off, which restricts its wider industrial application. This study aimed to address this limitation by incorporating ethylene glycol monophenyl ether (EGME) as filler in the Pebax membrane. The investigation focused on the impact of EGME on the chemical structure, morphology, physical and thermal properties, as well as the separation characteristics of the polymer. The results showed that by adding EGME, the prepared membrane became more brittle, with increased stiffness, and the tensile strength and Young's modulus of the Pebax/EGME membrane increased by 53 and 99.5 percent, respectively, compared to the pure membrane. Furthermore, the permeability of CO2 and the CO2/N2 selectivity improved by 247% and 49%, respectively, attributed to the interactions between EGME and CO2 molecules, including Lewis acid-base, dipole-quadrupole, and π-quadrupole interactions. This performance improvement allowed the Pebax/EGME membrane to surpass the Robeson upper bound, overcoming the permeability-selectivity trade-off, indicating the key role of EGME in improving the separation performance of Pebax. Moreover, The separation efficiency of the developed membranes was on par with, and in many cases superior to, the majority of membranes created by other researchers.

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Subjects

Article Title Persian

جداسازی CO2 ارتقا یافته با استفاده از غشای Pebax اصلاح شده با اتیلن گلایکول مونو فنیل اتر

Authors Persian

مهدی الیاسی کجاباد 1
پریا امیرعابدی 1
مسعود درفشان 2
1 استادیار، گروه مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه صنعتی خاتم‌الانبیاء بهبهان، بهبهان، ایران
2 استادیار، گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه صنعتی خاتم‌الانبیا بهبهان، بهبهان، ایران
Abstract Persian

جداسازی CO2 یکی از چالش‌های اساسی دنیای امروز می‌باشد که به دلیل رشد صنایع اتفاق افتاده است. روش جداسازی غشایی روشی نوین برای جداسازی CO2 می‌باشد که غشای پلیمری پلی اتر بلاک آمید (Pebax) یکی از غشاهای صنعتی در این راستا می‌باشد. این نوع غشا محدودیتی به نام محدودیت Trade-off دارد که مانع از کاربرد گسترده آن در صنعت می­شود. در این مطالعه به‌منظور غلبه بر این محدودیت، از اتیلن گلایکول مونو فنیل اتر (EGME) به‌عنوان پرکننده در زمینه Pebax استفاده شده و تأثیر آن بر روی ساختار شیمیایی، موفولوژی، خواص فیزیکی و حرارتی و نیز خواص جداسازی این پلیمر مورد بررسی قرار گرفت. نتایج نشان داد با افزودن EGME غشای تهیه شده تردتر و سفت­تر شده و استحکام کششی و مدول یانگ برای غشای حاوی EGME نسبت به غشای خالص به ترتیب ۵۳ و ۹۹/۵ درصد افزایش داشت. علاوه بر این عبور دهی CO2 و انتخاب‌گری CO2/N2 به دلیل برهمکنش‌های اسید-باز لوئیس، دوقطبی- چهارقطبی و π-چهارقطبی برقرار شده بین مولکول‌های EGME و CO2 به ترتیب ۲۴۷ و ۴۹ درصد ارتقا یافت به‌طوری که با این بهبود عملکرد، غشای Pebax حاوی EGME توانست از مرز بالایی رابسون عبور کرده و بر محدودیت Trade-off غلبه کند که نشانی بر نقش کلیدی EGME در بهبود عملکرد جداسازی Pebax بود. علاوه بر این، عملکرد جداسازی غشاهای تهیه شده با غشاهای ساخته شده توسط دیگر محققان قابل مقایسه بود و از اکثرشان بهتر بود.

Keywords Persian

جداسازی CO2
غشای پلیمری
پلی اتر بلاک آمید
اتیلن گلایکول مونو فنیل اتر
محدودیت Trade-off
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Journal of Gas Technology
Volume 9, Issue 2 - Serial Number 13
December 2024
Pages 28-38