بهینه‌سازی آماری با استفاده از طراحی مرکب مرکزی برای فرایند سیلیس‌زدایی از زئولیت طبیعی جهت جذب آب از سوخت دیزل

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشگاه تربیت مدرس دانشکده مهندسی شیمی

2 گروه فرآیند، دانشکده مهندسی شیمی، دانشگاه تربیت مدرس

3 دانشگاه تربیت مدرس دانشکده شیمی

چکیده

در این پژوهش، از زئولیت طبیعی کلینوپتیلولیت سیلیس‌زدایی ­شده برای حذف آب از سوخت دیزل استفاده شد. بهینه‌­سازی شرایط سلیس‌زدایی با استفاده از نرم‌افزار Design expert 7.0.0و به ­روش سطح پاسخ انجام شد. پارامترهای مورد بررسی غلظت محلول سدیم­هیدروکسید، دما و زمان فرایند سیلیس‌زدایی درنظر گرفته شد. پس از بهینه‌سازی شرایط فرایند سیلیس‌زدایی از زئولیت، نتیجه تحقیق نشان داد که در شرایط بهینه سیلیس‌زدایی با محلول سدیم­ هیدروکسید با غلظت 47/0 مولار در دمای 05/84 درجه سانتی‌گراد به­ مدت 42/2 ساعت درصد جذب آب 32/95% است. برای انجام فرایند جذب آب از سوخت، 5/0% وزنی- حجمی از زئولیت سیلیس­زدایی­شده و سوخت دیزل (5 گرم زئولیت به­ازای 1000 میلی‌لیتر سوخت) به­مدت 2 ساعت با دور ملایم همزن مخلوط شدند و میزان آب موجود در سوخت با دستگاه کارل فیشر کولومتر اندازه‌گیری شد. زئولیت طبیعی و زئولیت سیلیس‌زدایی­ شده در شرایط بهینه، توسط آنالیزهای طیف‌ سنجی پراش پرتو ایکس، فلوئورسانس پرتو ایکس، تبدیل فوریه مادون قرمز و میکروسکوپ الکترونی روبشی، مشخصه­ یابی و تحلیل شدند. با توجه به نتایج به ­دست ­آمده از آنالیزهای مشخصه‌یابی زئولیت، می‌توان نتیجه‌گیری کرد که سیلی ­زدایی به­ خوبی انجام شده است. نتایج جذب آب قبل و بعد از فرایند جذب نشان­ دهنده عملکرد قابل قبول زئولیت سیلیس‌زدایی ­شده است.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Statistical optimization using central composite design for the desilication process of natural zeolite to use in water adsorption from diesel fuel

نویسندگان [English]

  • Fatemeh Kouhestani 1
  • fatemeh Eslami 2
  • Ramin Karimzadeh 3
1 دانشگاه تربیت مدرس دانشکده مهندسی شیمی
2 Al ahmad St,Tarbiat Modares University, School of chemicaal engineering, 5th floor
3 Tarbiat Modares University
چکیده [English]

In this paper, natural zeolite (clinoptilolite) was desilicated to remove water from diesel fuel. Optimization of desilication conditions was done using Design-Expert 7.0.0 software and using response surface methodology. The parameters studied, the concentration of sodium hydroxide solution and the temperature and time of the desilication process were considered. After optimization of desilication process conditions, the water sorption percentage was 95.32% under the optimized conditions, the concentration of sodium hydroxide solution 0.47 molar, temperature 84.05 °C and time of 2.42 hours. To carry out the process of water sorption from fuel, amount of 0.5% w/v of the desilicated zeolite (5 g zeolite/1000 mL of the fuel) was mixed with diesel fuel for 2 h and the water content was measured by the volumetric Karl Fischer technique. The natural zeolite and the desilicated zeolite in the optimum conditions were characterized by XRD, XRF, FTIR and SEM analyses which indicate well desilication process. The results of water sorption before and after the sorption process indicate the acceptable performance of desilicated zeolite.

کلیدواژه‌ها [English]

  • Clinoptilolite
  • Adsorption
  • Desilication
  • Diesel fuel
  • Central composite design
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