بررسی اثر نانوساختار فولرن بر فرایند تشکیل هیدرات گاز طبیعی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 پژوهشگاه صنعت نفت

2 عضو هیت علمی دانشکده مهندسی شیمی دانشگاه تهران

3 آزمایشگاه پدیده های انتقال و فناوری نانو، دانشکده مهندسی شیمی، پردیس دانشکده‌های فنی دانشگاه تهران، تهران،

چکیده

در این مقاله نانوساختار فولرن توسط فرآیند کراشمر- هافمن با مکانیسم قوس الکتریکی در محیط آزمایشگاهی سنتز شد. به منظور استفاده در فرآیند تشکیل هیدرات گازی و بررسی تاثیر آن بر راندمان فرآیند و حجم ذخیره‌سازی، ابتدا نانوسیال با غلظت 1% ‌وزنی تهیه شد. از آنجائی‌که فولرن در آب پایدار نیست، از سورفکتانت SDS استفاده گردید و مشاهده شد نانوسیال مربوطه دارای پایداری خوبی است. در فرآیند تشکیل هیدرات از گاز طبیعی حاوی 6/92% ‌متان، نانوسیال حاوی فولرن ضمن تسریع در فرآیند انحلال گاز در آب، زمان القای فرآیند را 2/53% کاهش می‌دهد. فولرن به دلیل وجود حفرات انگسترومی در ساختار کروی خود مکان مناسبی جهت نگهداری مولکول‌های گاز است. به همین دلیل ظرفیت ذخیره‌سازی گاز درون هیدرات را 5/5% افزایش می‌دهد. همچنین علی رغم اینکه حضور نانوساختارهای فولرنی موجب کاهش 3/1% پایداری هیدرات شده، ولی در کل حضور این نانوساختارها موجب افزایش میزان گاز باقی‌مانده در هیدرات پس از رسیدن به پدیده خودنگهداری و پایداری کامل می‌شود.
 

کلیدواژه‌ها


عنوان مقاله [English]

Effects of Fullerene Nanostructure on Natural Gas Hydrate Formation Process

نویسنده [English]

  • ahmad ghozatloo 1
چکیده [English]

In this paper, nanostructure of fullerene was synthesized in laboratory by KRASHMR- HOFFMAN method based on arc mechanisms. First, fullerene nanofluid was prepared at 1wt.% in order to use in gas hydrate formation and investigation the effect of fullerene on yield of process and storage capacity.  Second since fullerene is not stable in water, SDS was used as surfactant for increasing the stability of the nanofluid. It was shownthat the prepared nanofluids had good stability. Third, in the process of natural gas hydrate formation containing 92.6% methane, fullerene nanofluid accelerates the gas solubility in water and reduces induction time of the process 53.2%. Angstrom pore structure due to the spherical shape of fullerene is great place to keep gas molecules. Therefore, the storage capacity of gas hydrates increased 5.5% by fullerene. It was observed despite that the presence of fullerene nanostructure reduced 1.3% of hydrate stability, but in the presence of this nanostructure results in increase of the residual gas hydrate after reaching the self presentation phenomenon and thorough stability.
 

کلیدواژه‌ها [English]

  • Fullerenes
  • hydrates
  • induction
  • storage

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