مدل‌سازی فرایند جداسازی اولفین- پارافین سبک با غشای مایع حمایت شده: با تأکید بر جداسازی مخلوط‌های اتیلن- اتان و پروپیلن- پروپان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی امیرکبیر

2 شرکت پژوهش و فناوری پتروشیمی

چکیده

جداسازی الفین- پارافین با تعداد کربن برابر یکی از مراحل مهم و پرهزینۀ تولید الفین در صنعت پتروشیمی است. فناوری غشای مایع با استفاده از محلول­های یونی می­تواند جداسازی الفین- پارافین را به شکلی گزینش­پذیر انجام دهد. در این مقاله، جداسازی اولفین-پارافین سبک با استفاده از غشای مایع حمایت شده در حالت ناپایا مدل‌سازی شده است. در این مدل، انتقال جرم در راستای ضخامت غشا بوده و اثر متغیرهای فشار خوراک، غلظت نقره، نوع حلال و زمان بر میزان شار بررسی شده است. برای صحت‌سنجی مدل، از داده‌های آزمایشگاهی جداسازی اتیلن- اتان با محلول آبی نیترات­نقره و پروپیلن- پروپان با محلول‌های آبی نیترات­نقره،  و  استفاده شد. نتایج مدل‌سازی با مقادیر تجربی تطابق قابل قبولی (اختلاف 2/12%) داشت. همچنین نتایج نشان داد که استفاده از حلال‌های گران‌رو یا یونی، که برای رفع مشکل تبخیر محلول جای‌گزین آب (حلال) شده‌اند، باعث کاهش شار و گزینش‌پذیری محصول می‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

Modeling of Light Olefin-Paraffin Separation Process Using Supported Liquid Membrane: with Emphasis on Separation of Ethylene-Ethane and Propylene-Propane

نویسندگان [English]

  • M. Nikjou 1
  • M. Soleimani 1
  • A. Kargari 1
  • M. Takht Ravanchi 2
1 Amirkabir University of Technology
2 Petrochemical Research and Technology Company
چکیده [English]

Olefin-paraffin separation with equivalent carbon number is an important cost-effective step in olefin production in petrochemical industries. Liquid membrane technology using ionic solutions can perform olefin-paraffin separation in a selective manner. In this paper, the separation of light olefin-paraffin mixtures using supported liquid membrane is modeled in an unsteady-state manner. In this model, mass transfer is considered in the direction of membrane thickness and the effect of feed pressure, silver concentration, solvent type and time on flux rate was investigated. For model evaluation, experimental data of ethylene-ethane separation with aqueous solution of silver nitrate and propylene-propane separation with aqueous solution of silver nitrate, AgNO3-NMP and AgBF4-BMImBF4 were used. There is a good agreement between experimental and modeling data (with 12.2% difference). Moreover, it was concluded that by using viscose or ionic liquids, which are substituted for water (solvent) in order to solve evaporation problems, cause a decrease in flux and product selectivity.

کلیدواژه‌ها [English]

  • supported liquid membrane
  • Facilitated Transport
  • Modeling
  • Light Olefin-Paraffin Separation

 

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