بررسی پارامترهای موثر برجذب آسفالتین از تولوئن روی سطح مواد معدنی لیکا، پرلیت و بنتونیت

نوع مقاله: مقاله پژوهشی

نویسندگان

دانشکده مهندسی شیمی، دانشگاه تربیت مدرس، تهران، ایران

چکیده

در این مقاله امکان حذف آسفالتین از محلول حاوی آسفالتین با استفاده از جاذب‌های طبیعی کم هزینه مانند لیکا، پرلیت و بنتونیت بررسی شد. اثر نوع جاذب، غلظت اولیه آسفالتین، اندازه ذرات جاذب و دما بر ظرفیت جذب بررسی شدند. نتایج نشان داد که در غلظت اولیه آسفالتین mg. L-1 125، زمان تماس hr 24، درجه حرارت C°50 و مقدار g 1 جاذب، مقدار حذف آسفالتین توسط لیکا، پرلیت و بنتونیت به‌ترتیب. 59/53، 01/93 و 77/99% بود، همچنین مدل جذب تعادلی لانگمویر و فروندلیچ برای توصیف داده‌های تجربی به کار گرفته شد و نتایج نشان داد که مدل ایزوترم لانگمویر داده‌ها را به‌خوبی پیش‌بینی می‌کند. محاسبه پارامترهای ترمودینامیکی ΔHا،ΔS و ΔG. نشان می‌دهد که فرآیند جذب خود به خودی و گرمازا است، که با کاهش رنگ محلول آشکار شد. نتایج شناسایی جاذب‌ها و فاکتور جداسازی نشان می‌دهد که پرلیت و بنتونیت می‌تواند به‌عنوان جاذب تجاری ارزان قیمت برای حذف آسفالتین از محلول و نفت مورد استفاده قرار گیرد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Effective Parameters of Adsorption of Asphaltenes from Toluene on Mineral Surface LECA, Perlite and Bentonite

نویسندگان [English]

  • Samira Veisi
  • Samira Veisi
  • Mohammad Mahdi Shadman
  • Saeb Ahmdi
Chemical Engineering Department, Tarbiat Modares University, Tehran, Iran
چکیده [English]

This paper presents the feasibility (or possibility) of removal of asphaltenes from aqueous solutions by using low-cost natural adsorbents; such as, light expanded clay aggregate (LECA), perlite and bentonite. The effect of adsorbent type, initial asphaltene concentration, particle size of adsorbent and temperature on the adsorption capacity was investigated. The results showed that at the initial asphaltene concentration of 125 mg L 1-, contact time of 24 hrs, temperature of °50C and adsorbent dosage of 1 g, removal of asphaltenes onto LECA, perlite and bentonite was 53.59, 93.01 and %99.77, respectively. Also, Langmuir and Freundlich models were applied to describe the experimental data; moreover, the results indicated a good fitting by Langmuir isotherm. Thermodynamic parameters; such as, ∆H, ∆S and ∆G were calculated. It was revealed that the adsorption was spontaneous and exothermic nature, which was evident by decreasing the randomness of the dye at the solid and liquid interfaces. The characteristic results and the dimensionless separation factor (RL) showed that perlite and bentonite could be employed as an alternative to commercial adsorbents in the removal of asphaltenes from aqueous solution and oil.
 

کلیدواژه‌ها [English]

  • Asphaltenes
  • Adsorption Isotherm
  • LECA
  • Perlite
  • Bentonite

 

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