بهبود خواص غشای پلی‌ایمیدی به کمک چارچوب های آلی-فلزی اصلاح شده برای جداسازی‌های CO2/CH4 و CO2/N2

نوع مقاله : مقاله پژوهشی

نویسندگان

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

10.61882/masm.4.4.669.
چکیده
امروزه جداسازی گاز دی­اکسیدکربن (CO2) از گازهای دیگر ازجمله نیتروژن (N2) و متان (CH4) از چالش­های اصلی جداسازی محسوب شده و بسیار مورد توجه قرار گرفته است. در مقایسه با فناوری‌های مختلف جداسازی گاز، فناوری غشایی به دلیل مزایای فراوان ازجمله فرآیند پذیری آسان و هزینه کمتر نسبت به سایر فناوری­ها توجه بسیاری را به خود جلب کرده است. انتخاب و طراحی درست مواد سازنده غشا مهم‌ترین و مؤثرترین فاکتور در عملکرد نهایی آن است. امروزه استفاده از پرکننده­هایی با مورفولوژی­های مختلف جهت تهیه غشاهای شبکه آمیخته با کارایی بالا مورد بررسی قرار گرفته است. در این پژوهش غشای شبکه آمیخته جدیدی بر پایه پلی­ایمید و چارچوب­های آلی-فلزی (MOF) فلوئورینه با مورفولوژی خاص تهیه شد. غشاهای شبکه آمیخته با استفاده از روش ریخته­گری محلول-تبخیر حلال ساخته شده و عملکرد آن­ها در جداسازی CO2/CH4 و CO2/N2 مورد مطالعه قرار گرفت. نتایج نشان داد که حضور ذرات با مورفولوژی بیضوی موجب افزایش سرعت نفوذپذیری CO2 و درنتیجه افزایش عملکرد غشا شده است. غشای حاوی 8 درصد وزنی از ذرات بهترین عملکرد را در تراوایی CO2 و گزینش­پذیری­های CO2/CH4 و CO2/N2 در فشار خوراک 2 بار و دمای °C 25  نشان داد که به ترتیب مقادیر 12/1079 بارر، 96/56 و  88/53 برای غشای حاوی 8 درصد به دست آمدند. عملکرد غشاهای شبکه آمیخته سنتز شده در این کار در جداسازی CO2/CH4 از حد بالایی نمودار رابسون فراتر رفته و برای CO2/N2 روی آن قرار گرفته است که می­تواند به‌عنوان گزینه مناسب جهت جداسازی صنعتی گاز CO2 شناخته شود. 

کلیدواژه‌ها


عنوان مقاله English

Improving properties of polyimide membrane using modified MOF for CO2/CH4 and CO2/N2 separations

نویسندگان English

Reyhane Ahmadi
Abtin Ebadi
Hamidreza Sanaeepur
Department of Chemical Engineering, Faculty of Engineering, Arak University
چکیده English

Nowadays, the separation of carbon dioxide (CO2) from other gases such as nitrogen (N2) and methane (CH4) is considered one of the main environmental challenges and has received much attention. Compared to different gas separation technologies, membrane technology has attracted much attention due to its many advantages such as modularity and low cost over other technologies. The correct selection and design of membrane materials is the most important and effective factor in its final performance. Nowadays, the use of nanoparticles with different morphologies has been investigated to prepare high performance mixed matrix membranes (MMMs). In this research, a new mixed matrix membrane (MMM) based on polyimide (PI) and metal-organic frameworks (MOF) with specific morphology was prepared. MMMs were prepared using solution casting-solvent evaporation method and their performance in CO2/CH4 and CO2/N2 separation was investigated. The results showed that the presence of particles with ellipsoidal morphology increased the rate of CO2 diffusion and as a result increased membrane performance. The membrane containing 8 wt.% of filler showed the best performance in CO2 permeability and CO2/CH4 and CO2/N2 selectivities at 2 bar and 25°C, which were about 1079.12 barrer, 56.96 and 53.88, respectively. The performance of synthesized membranes in CO2/CH4 separation exceeds Robeson's upper limit and is placed on it for CO2/N2, which can be recognized as a suitable option for industrial CO2 gas separation.

کلیدواژه‌ها English

Mixed matrix membrane
Polyimide
particles with specific morphology
Carbon dioxide
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دوره 4، شماره 4
زمستان 1403
صفحه 669-683

  • تاریخ دریافت 21 آبان 1403
  • تاریخ بازنگری 23 آذر 1403
  • تاریخ پذیرش 30 آذر 1403