اثر ابعاد تارساز بر ساختار و کارایی غشای الیاف توخالی پلی‌‌اترایمید در تماس‌دهنده غشایی

نوع مقاله: پژوهشی

نویسنده

بابل، دانشگاه صنعتی نوشیروانی بابل، دانشکده مهندسی شیمی، آزمایشگاه تحقیقاتی فناوری‌های نوین غشایی، صندوق پستی 484

چکیده

در ساخت غشاهای الیاف توخالی، پارامترهای مختلفی نظیر درصد اجزا و سرعت حجمی محلول پلیمری و سیال درونی و فاصله هوایی بر ساختار و خواص غشا اثرگذارند. یکی از این پارامترها، ابعاد تارساز استفاده شده در ساخت غشاست که در پژوهش حاضر اثر این پارامتر بر خواص و کارایی غشای الیاف توخالی پلی‌اترایمید در تماس‌دهنده غشایی بررسی شد. از محلول پلیمری برای ساخت دو غشای الیاف توخالی استفاده شد، در حالی که ابعاد تارساز استفاده شده در ساخت غشاها با هم متفاوت بود. با افزودن آب به‌عنوان ضدحلال به محلول پلیمری، پایداری ترمودینامیکی محلول کاهش یافت تا با سرعت‌دهی به فرایند تغییر فاز، آثار تغییر در جهت‌گیری یا آسودگی زنجیرهای پلیمری بر ساختار غشای الیاف توخالی به حداقل مقدار برسد. غشاها با استفاده از آزمون‌های مختلف بررسی شد و کارایی آن‌ها در تماس‌دهنده غشایی و در فرایند جذب CO2 در دو حالت آب مقطر درون الیاف و گاز CO2 خالص در پوسته تماس‌دهنده و برعکس ارزیابی شد. نتایج این پژوهش نشان داد، ابعاد کوچک‌تر تارساز باعث بهبود خواص غشا شده که افزایش %250 اندازه متوسط حفره‌ها و افزایش %300 سرعت عبوردهی گاز از آن جمله است. همچنین، ابعاد کوچک‌تر تارساز باعث ایجاد حفره‌های بیشتری در ساختار غشا می‌شود که می‌توان آن را ناشی از کوتاه‌شدن طول نفوذ منعقدکننده دانست. همچنین، جذب CO2 به مقدار %150 افزایش یافته است.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Spinneret Dimension on Structure and Performance of Polyetherimide Hollow Fiber Membrane in Membrane Contactor

نویسنده [English]

  • Gholamreza Bakeri
Advanced Membrane Research Laboratory, Faculty of Chemical Engineering, Babol Noshirvani University of Technology, P.O. Box: 484, Babol, Iran
چکیده [English]

In hollow fiber membrane fabrication process, a number of parameters such as dope compositions and flow rate, bore fluid type and flow rate, air gap etc. affect on the structure and characteristics of membrane. One of effective parameters is the dimension of spinneret and in this study; the effects of this parameter on the properties of polyetherimide (PEI) hollow fiber membrane and its performance in membrane contactor were studied. A polymer solution was used for fabrication of two PEI membranes at the same fabrication conditions while the dimension of spinneret was different. Through the addition of water as the nonsolvent additive to the polymer solution, the thermodynamic stability of the solution decreased and upon the enhancement in the phase inversion process, the effects of chain reorientation or chain relaxation on the structure of hollow fiber membrane were minimized. The fabricated membranes were characterized by different tests and their performance in membrane contractor and in CO2 absorption test was evaluated in two cases: 1- distilled water in lumen side and pure CO2 in shell side, 2- distilled water in shell side and pure CO2 in lumen side. The results show that smaller dimension of spinneret enhances the properties of membrane such as 250% increase in mean pore size and 300% increase in gas permeation rate. In addition, the smaller dimension of the spinneret makes more pores in the structure of membrane that can be related to the shorter diffusion length of the coagulant. Furthermore, the CO2 absorption flux improves by 150%.

کلیدواژه‌ها [English]

  • spinneret dimension
  • polyetherimide hollow fiber membrane
  • membrane contactor
  • membrane characteristics
  • absorption process
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