بهبود جداسازی CO₂ در غشاهای نانوکامپوزیتی لایه نازک Pebax® 1657 از طریق افزودن کالیکس[4]آرن

عابدینی, رضا; محمدپور, محمدابراهیم

doi:10.61882/jii.2.4.407

بهبود جداسازی CO₂ در غشاهای نانوکامپوزیتی لایه نازک Pebax® 1657 از طریق افزودن کالیکس[4]آرن

نوع مقاله : مقاله پژوهشی

نویسندگان

رضا عابدینی

محمدابراهیم محمدپور

دانشکده مهندسی شیمی، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران.

10.61882/jii.2.4.407

چکیده

در چند سال اخیر بوده است. لذا جداسازی این گاز از انواع جریان‌های گازی در صنایعی نظیر پالایشگاهی، پتروشیمی و نیروگاهی از اهمیت ویژه‌ای برخوردار است. غشاهای لایه نازک نانو کامپوزیتی (TFN) به دلیل عملکرد بسیار خوب (تراوایی و گزینش‌پذیری بالا) و کاهش مشکلات غشاهای پلیمری مورد توجه پژوهشگران قرار گرفته است. در این مطالعه، جهت بهبود فرآیند جداسازی CO2 از CH4 از یک غشای TFN جدید بر پایه Pebax 1657 که روی زیر لایه PES قرار دارد استفاده شد. از ذرات (CA) Calix[4]areneبه‌دلیل ساختار منحصر به فرد (فنجانی) مهمان – میزبان و حضور گروه‌های عاملی قطبی OH که جاذب مناسبی برای CO2 می‌باشد بر روی شبکه پلیمری Pebax استفاده شد. غشای خالص Pebax با درصد وزنی مختلف (0 تا 1) از ذرات سنتز شده CA اصلاح شد. نتایج آنالیز FESEM حاکی از آن بوده که ذرات به‌خوبی در شبکه پلیمری پراکنده شده‌اند. آزمون گاز تراوایی در دمای C ° 30 و در فشارهای bar 2، 6 و 10 انجام شد. بهترین عملکرد غشا در 5/0 درصد وزنی ذره CA در فشار bar 2 در C ° 30 بود. در این غشا میزان تراوایی و گزینش‌پذیری CO2/CH4 نسبت به غشای خالص به ترتیب از barrer 9/278 و 04/23 به barrer 7/389 و 17/40 افزایش یافت. با افزایش فشار به bar10، میزان تراوایی و گزینش پذیری CO2/CH4 به ترتیب به barrer 3/568 و 71/55 افزایش یافت. در فشار bar6 با افزایش دما از C ° 30 به C ° 50، میزان تراوایی و گزینش‌پذیری CO2/CH4 به ترتیب از barrer 4/472 و 71/47 به barrer 7/694 و 35/41 تغییر یافت. این مطالعه نشان داده که می‌توان به ذرات آلی همانند CA با ساختار فنجانی منحصر به فرد که در خود گروه‌های عاملی قطبی هیدروکسیل دارند جهت جداسازی CO2 امیدوار بود.

کلیدواژه‌ها

Pebax

جداسازی دی‌اکسید کربن

Calix[4]arene

غشای لایه نازک

عنوان مقاله English

CO₂ Separation Enhancement in Pebax® 1657 Thin-Film Nanocomposite Membranes via Calix[4]arene Incorporation

نویسندگان English

Reza Abedini

Mohammad Ebrahim Mohammadpour

Faculty of Chemical Engineering, Babol Noshirvani University of Technology, Babol, Iran.

چکیده English

The emission of the greenhouse gas carbon dioxide (CO₂) from the combustion of fossil fuels has been one of the major challenges for industries in recent years. Therefore, the separation of this gas from various gas streams in industries such as refineries, petrochemical plants, and power plants is of significant importance. Thin-film nanocomposite (TFN) membranes have attracted great attention due to their excellent performance, including high permeability and selectivity, as well as their ability to overcome the limitations of polymeric membranes. In this study, a novel TFN membrane based on Pebax 1657 (polyether block amide) coated on a PES substrate was developed to improve CO₂/CH₄ separation. Calix[4]arene (CA) particles were incorporated into the Pebax matrix owing to their unique cup-shaped host–guest structure and the presence of polar hydroxyl (–OH) groups, which serve as effective adsorption sites for CO₂ molecules. The pristine Pebax membrane was modified with different CA loadings (0–1 wt%), and FESEM analysis confirmed uniform dispersion of the particles within the polymer network. Gas permeation tests were performed at 30 °C and pressures of 2, 6, and 10 bar. The best performance was obtained at 0.5 wt% CA loading and 2 bar pressure. In this membrane, the permeability and selectivity of CO₂/CH₄ increased from 278.9 barrer and 23.04, respectively, for the pristine membrane to 389.7 Barrer and 40.17. With increasing pressure to 10 bar, CO₂ permeability and CO₂/CH₄ selectivity further increased to 568.3 barrer and 55.71, respectively.
At a pressure of 6 bar, when the temperature was raised from 30°C to 50°C, CO₂ permeability and CO₂/CH₄ selectivity changed from 472.4 barrer and 47.71 to 694.7 barrer and 41.35, respectively. These findings demonstrate that organic fillers such as CA, with their unique cup-like structures and polar hydroxyl functional groups, hold great promise for efficient CO₂ separation applications.

کلیدواژه‌ها English

Pebax

CO₂ Separation

Calix[4]arene

Thin film nanocomposite

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