Effect of Coating Method and Feed Pressure and Temperature on CO2/CH4 Gas Separation Performance of Pebax/PES Composite Membranes

Document Type : Original Article

Authors

1 Chemical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

2 Advanced Membrane Technology Research Centre (AMTEC), University Technology Malaysia, Malaysia

20.1001.1.25885596.2018.3.1.6.2

Abstract

In this study, PES/Pebax composite membranes were prepared by coating the porous PES support layers by Pebax-1657. Film casting and pouring methods were used for coating Pebax layer. The effects of coating technique and conditions including coating solution concentration and curing temperature on CO2 and CH4 gas permeabilities of prepared composite membranes were investigated. SEM images were used to investigate the structure of the prepared membranes. Pure CH4 and CO2 gases were used to investigate the gas permeation properties of the prepared membranes at different trans-membrane pressures (1-11 bar) and feed temperatures (25-55°C). The obtained data showed that the prepared PES supports did not provide any CO2/CH4 selectivity. The results also showed the CO2/CH4 selectivity for the membrane prepared via pouring technique was higher than that of the film casting procedure due to the defect-free Pebax layer formation. CO2 and CH4 permeance increased as the feed temperature increased from 25 to 55°C. The results also showed that CO2 permeance increased from 6.8 to 10.1GPU with an increase in feed pressure from 2 to 12barg, while CH4 permeance remained almost constant and CO2/CH4 selectivity increased from 27 to 42.

Keywords

Article Title [فارسی]

اثر روش پوشش و فشار و دمای خوراک بر عملکرد جداسازی دی‌اکسیدکربن/متان غشاهای مرکب Pebax/PES

Authors [فارسی]

  • حمیدرضا افشون 1
  • مهدی پورافشاری چنار 1
  • احمد فوزی اسماعیل 2

1 گروه مهندسی شیمی، دانشکده مهندسی، دانشگاه فردوسی مشهد، ایران

2 مرکز تحقیقات پیشرفته فناوری غشا (AMTEC)، دانشگاه فناوری مالزی (UTM)، مالزی

Abstract [فارسی]

در این مطالعه غشای مرکب Pebax/PES با پوشش تک لایه Pebax-1657 بر روی لایه متخلخل PES ساخته شد. روش‌های ریخته‌گری و ریزش محلول برای پوشش لایه بالایی استفاده شدند. تاثیر روش پوشش و شرایطی مانند غلظت محلول Pebax و دما بر تراوش‌پذیری CO2 و  CH4 غشاهای مرکب ساخته شده بررسی شد. تصاویر SEM برای بررسی ساختار غشاهای ساخته شده استفاده شد. گازهای خالص  CO2 و  CH4 برای بررسی خواص تراوش‌پذیری غشاهای ساخته شده در فشار و دمای خوراک به ترتیب 1تا barg12 و 25تا °C55 استفاده شدند. نتایج به‌دست آمده نشان داد که زیرلایه PES قبل از پوشش هیچ گزینش‌پذیری CO2/CH4  نداشته است. نتایج همچنین نشان داد که غشاهای ساخته شده با روش ریزش محلول گزینش‌پذیری CO2/CH4  بالاتری نسبت به غشاهای ساخته شده با روش ریخته‌گری داشته که این به دلیل شکل‌گیری لایه انتخابگر بدون نقص در حین پوشش با روش ریزش محلول است. تراوایی دی‌اکسیدکربن و متان با افزایش دمای خوراک از 25 تا °C55 افزایش یافت. نتایج همچنین نشان داد که با افزایش فشار خوراک از 2 تا barg12 تراوایی CO2 از 8/6 تا GPU 1/10  افزایش داشته، ضمن این‌که تراوایی متان تقریبا ثابت مانده و در نتیجه گزینش‌پذیری CO2/CH4 از 27 به 42 افزایش داشته است.

Keywords [فارسی]

  • Pebax
  • غشای مرکب
  • جداسازی CO2
  • روش پوشش
  • فشار خوراک
  • دما
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