تهیه غشاهای شبکه‌آمیخته حاوی پلی‌اتر بلاک آمید و نانوذرات نقره به‌منظور بررسی تراوایی گازهای دی‌اکسیدکربن، نیتروژن و متان

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی شیمی، دانشگاه تربیت مدرس، تهران، ایران

2 گروه مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه اراک، ایران

10.22078/pr.2018.3021.2400

چکیده

در میان انواع مختلف پلی‌اتر بلاک آمیدها، پباکس1657 خواص جداسازی بسیار مناسبی را برای گازهای قطبی یا میعان‌پذیر مانند دی‌اکسید‌کربن نسبت به سایر گازهای سبک از خود نشان می‌دهد. در این پژوهش از پلیمر پباکس1657 به‌عنوان فاز آلی و نانوذرات نقره به‌عنوان فاز معدنی، به‌منظور ساخت غشاهای شبکه آمیخته استفاده شد. نانوذرات نقره به‌عنوان پرکن ازیک‌طرف می‌تواند در زنجیره‌های پلیمری وارد شده و با افزایش حجم آزاد جزئی غشاها، تراوایی گاز را ارتقا بخشد. از طرف دیگر نانوذرات نقره که در کنار بخش غنی از الکترون زنجیره پلی‌اتیلن اکساید در کوپلیمر، به‌طور نسبی باردار شده‌اند، می‌تواند میل جذب غشاها را نسبت به گاز دی‌اکسید‌کربن افزایش دهد، که خود باعث افزایش نفوذپذیری گاز دی‌اکسید‌کربن نسبت به گازهای سبک در غشاهای شبکه آمیخته می‌گردد. تراوایی و گزینش‌پذیری غشاها در دما و فشارهای عملیاتی مختلف مورد بررسی قرار گرفت. همچنین غشاها توسط آنالیزهای FTIR ،SEM و XRD مشخصه‌سازی شدند. نتایج آنالیزهای انجام‌شده نشان داد که نانوذرات نقره بخش بلوری غشا را کاهش داده و با زنجیره آمورف کوپلیمر برهمکنش داشته، که هردو عامل می‌توانند باعث ارتقای ویژگی‌های انتقالی گازهای قطبی گردند. همچنین نتایج آزمایش‌های تراوایی گاز، افزایش چشمگیری در تراوایی و گزینش‌پذیری در دمای C° 35 و فشار bar 10 را نشان داد. در غشای بهینه در مقایسه با غشای خالص، گزینش‌پذیری CO2/CH4 و CO2/N2 به ترتیب حدود 112 و 76% افزایش یافت. از طرفی افزایش حجم آزاد جزئی در شبکه پلیمری خالص، تراوایی گاز دی‌اکسید‌کربن را تا 141% افزایش داد.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Preparation of Mixed Matrix Membranes Containing Polyether Block Amide and Silver Nanoparticles to Evaluate the Permeability of CO2, N2, and CH4 Gases

نویسندگان [English]

  • Ehsan Ghasemi Estahbanati 1
  • Mohammadreza Omidkhah 1
  • Abtin Ebadi Amooghin 2
1 Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran
2 Department of Chemical Engineering, Faculty of Engineering, Arak University, Iran
چکیده [English]

Among the various types of Poly (ether block amides), Pebax1657 shows excellent separation properties for polar or condensable gases such as carbon dioxide in comparison with other light gases. In this research, Pebax1657 as an organic phase and silver nanoparticles as an inorganic phase were considered for preparation of mixed matrix membranes. Moreover, in one side, silver nanoparticles as fillers could enter the polymer chains and enhance the gas permeability by increasing the fractional free volume of membranes. On the other side, partially positively polarized silver nanoparticles beside electron rich parts of PEO segment of the copolymer could increase the CO2 affinity of membranes, which results in increasing the permselectivity of the MMMs for CO2 over CH4 and N2. Also, permeability and selectivity of membranes were studied at different operating temperature and pressures. Moreover, (fabricated) membranes were characterized by FTIR, SEM, and XRD analyses. Obtained results revealed that Ag nanoparticles have decreased the membrane crystallinity and interacted with soft segment of the copolymer, which could enhance transport properties of the polar gases. In addition, the results of gas permeation have shown excellent improvement in permeability and selectivity at temperature of 35 °C and pressure of 10 bar. For the optimum membrane in comparison with the neat one, CO2/CH4 and CO2/N2 selectivities have increased about 112 about 76 % respectively. On the other hand, an increase in the fractional free volume of the neat polymeric matrix has caused to enhance the CO2 permeability up to 141 %.
 

کلیدواژه‌ها [English]

  • Mixed Matrix Membranes
  • CO2 Permeability
  • Pebax1657 Copolymer
  • Silver Nanoparticles
  • Selectivity

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