اصلاح سطح غشای الیاف توخالی PVDF-CTFE با درشت‌مولکول‌های اصلاح‌کننده سطح برای جذب و حذف کربن دی‌اکسید

نوع مقاله: پژوهشی

نویسندگان

گروه مهندسی شیمی، واحد گچساران ، دانشگاه آزاد اسلامی، گچساران، ایران

10.22063/jipst.2020.1742

چکیده

فرضیه: درشت‌مولکول‌های آب‌گریز اصلاح‌کننده سطح دارای زنجیر اصلی پلی‌یورتان با دو انتهای پلیمر آب‌گریز بر پایه فلوئور هستند. این درشت‌مولکول‌ها در فرایند ساخت غشا تمایل به مهاجرت به سطح غشا را دارند و با تشکیل لایه نازکی بر سطح غشا، موجب تغییر خواص فیزیکی و شیمیایی آن می‌شوند. بنابراین، آب‌گریزی سطح غشا را افزایش می‌دهند که عامل مهمی در سامانه تماس‌دهنده غشایی گاز-مایع است
روش‌ها: غشاهای الیاف توخالی پلی(وینیلیدن فلوئورید-کلروتری‌فلوئورواتیلن)، PVDF-CTFE، با استفاده از درشت‌مولکول اصلاح‌کننده سطح (SMM) و روش جدایی فاز خشک-تر ساخته شدند. ساختار و ویژ‌گی‌های غشاها بررسی شد و از آن‌ها در فرایندهای جذب و حذف کربن دی‌اکسید (CO2) در سامانه تماس‌دهنده غشایی گاز-مایع استفاده شد.
یافته‌ها: زاویه تماس سطح بیرونی غشای ساخته‌شده بدون SMM، برابر 90.51 درجه اندازه‌گیری شد. افزودن SMM به غشا زاویه تماس را به °114.20 افزایش داد. فشار بحرانی ورود آب به منفذهای غشاهای ساخته‌شده بدون SMM و با آن به‌ترتیب 7 و 10.50bar اندازه‌گیری شد. در شدت جریان فاز مایع 300mL/min  شار جذب گاز CO2 برای غشاهای ساخته‌شده بدون SMM و با آن به‌ترتیب 3-10×1.76 و mol/m2 9.70×10-3 به‌دست آمد. در شدت جریان مایع 200mL/min، شار حذف گاز CO2 در غشای ساخته‌شده بدون SMM و با آن اندازه‌گیری شد. در سرعت جریان مایع 200mL/min حداکثر بازده حذف گاز CO2 غشاهای ساخته‌شده بدون SMM و با آن به‌ترتیب 72.10 و %42.60 به‌دست آمد.

کلیدواژه‌ها


عنوان مقاله [English]

Surface Modification of PVDF-CTFE Hollow Fiber Membrane with Surface Modifying Macromolecules for Carbon Dioxide Absorption and Stripping

نویسندگان [English]

  • Mohammad Javad Jahangard
  • Masoud Rahbari-Sisakht
Department of Chemical Engineering, Gachsaran Branch, Islamic Azad University, Gachsaran, Iran
چکیده [English]

Hypothesis: Hydrophobic surface modifying macromolecules (SMM) have a main chain of polyurethane with two ends having a fluorine-based hydrophobic polymer. These macromolecules tend to migrate to the membrane surface during membrane fabrication process and alter the physical and chemical properties of the membrane surface by formation of a thin layer on the surface of the membrane. Therefore, they can increase the hydrophobicity of the membrane surface which is an important parameter in gas-liquid membrane contactor system.
Methods: Poly(vinylidene fluoride-co-chlorotrifluoroethlene), PVDF-CTFE, hollow fiber membranes were fabricated using surface modifying macromolecules through a dry-wet phase inversion method. Structure and characteristics of fabricated membranes were evaluated and they were used in carbon dioxide absorption and stripping processes in a gas-liquid membrane contactor system.
Findings: Water contact angle of outer surface of the fabricated membrane without SMM was measured as 90.51°. Addition of SMM into the membrane increased contact angle to 114.20°. Critical entry pressure of water of the membrane fabricated without/with SMM was measured as 7 and 10.50 bar, respectively. The CO2 absorption flux of
1.76×10-3 mol/m2.s and 9.70×10-4 mol/m2.s, at the liquid phase flow rate of 300 mL/min, was achieved for the fabricated membrane without/with SMM, respectively. The CO2 stripping flux, at the liquid flow rate of 200 mL/min, for the fabricated membrane was achieved at 1.30×10-3 mol/m2.s without SMM and 6.40×10-4 mol/m2.s with SMM. The maximum CO2 stripping efficiency, at the liquid flow rate of 200 mL/min, was achieved for the fabricated membrane at 72.10% without SMM and 42.60% with SMM.

کلیدواژه‌ها [English]

  • PVDF-CTFE copolymer
  • surface modifying macromolecule
  • CO2 absorption and stripping
  • hollow fiber membrane
  • gas-liquid membrane contactor
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