بررسی میزان برهم‌کنش اسیدهای تک عاملی و چندعاملی با آسفالتین به‌وسیله‌ طیف‌سنجی فرابنفش- مرئی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه شیمی دانشکده علوم، دانشگاه شهید چمران اهواز، ایران

2 دانشکده نفت، دانشگاه صنعت نفت، اهواز، ایران

چکیده

رسوب آسفالتین یکی از مشکلات اساسی در تولید نفت خام می‌باشد. یکی از روش‌های مناسب برای جلوگیری از رسوب آسفالتین استفاده از ترکیبات شیمیایی مختلف به‌عنوان ممانعت کننده یا پخش کننده ذرات آسفالتین است. در این راستا به دلیل ماهیت قطبی آسفالتین، اسیدها دسته‌ای مهمی از ترکیبات شیمیایی هستند که می‌توانند جهت کاهش مشکل رسوب آسفالتین به کار روند. میزان کارایی اسیدها وابسته به برهم‌کنش آنها با تجمعات آسفالتین می‌باشد. در این تحقیق، میزان برهم‌کنش اسیدهای تک‌عاملی، چندعاملی و مخلوط دوتایی آنها با آسفالتین استخراج شده از یک نمونه نفت خام ایران با استفاده از طیف‌سنجی فرابنفش-مرئی بررسی‌شده است. کاهش میزان جذب محلول آسفالتین-تولوئن در حضور محلول آبی اسیدها، شاخصی از میزان برهم‌کنش اسیدها با آسفالتین می‌باشد. عملکرد این اسیدها و مخلوط دوتایی آن‌ها جهت کاهش میزان رسوب آسفالتین در مقادیر مولی مختلف باهم مقایسه شد. نتایج آزمایش‌ها نشان داد با افزایش میزان مقادیر مولی، میزان برهم‌کنش اسیدها با آسفالتین افزایش می‌یابد. بین اسیدهای بررسی شده، میزان برهم‌کنش اگزالیک اسید و آدیپیک اسید با آسفالتین نسبت به اسیدهای دیگر بیشتر است. همچنین، اثر مخلوط‌هایی دوتایی اسیدها بر روی میزان رسوب آسفالتین بررسی شد نتایج نشان داد که مخلوط‌های دوتایی حاوی پارا-تولوئن سولفونیک اسید نسبت به دیگر مخلوط‌های دوتایی، بیشترین میزان برهم‌کنش را با تجمعات آسفالتین در جهت کاهش میزان رسوب دارند.
 

کلیدواژه‌ها


عنوان مقاله [English]

Investigating of Interactions of Mono and Multi-functional Acids with Asphaltene by Using UV-vis Spectroscopy

نویسندگان [English]

  • Edris Mardani 1
  • Babak Mokhtari 1
  • Bahram Soltani Soulgani 2
1 Chemistry Department, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
2 Petroleum Department, Petroleum University of Technology, Ahvaz, Iran
چکیده [English]

Asphaltene deposition is one of the main problems in crude oil production.  Using of asphaltene dispersants and inhibitors are one of the effective methods for preventing deposition of asphaltene particles. Acids are an important class of chemical compounds that could reduce asphaltene problems, regarding to the polarity of asphaltenes and acid molecules. Their efficiency is related to the amount of asphaltene-acid interaction. In this study, the amount of the interaction of acids and their binary mixtures was studied with extracted asphaltene from Iran crude oil by using UV-vis spectroscopy. Different acids were examined that included mono and multi-functional acids. In this method, decreasing the UV absorbance was assisted as index for the amount of the interaction of acids with asphaltene in the asphaltene-toluene solution with the presence of aqueous solution of acids and their binary mixtures. Solubility performance of acids and their binary mixtures was compared for reducing the amount of asphaltene precipitation by changing their mole volume. Experimental results show that the interaction of asphaltene-acids increases with increasing the amount of acid. Among the all studied acids, Interactions of adipic acid and oxalic acid with asphaltene are more than of other acids. The effect of acids binary mixture also investigated on asphaltene precipitation. Results of experiments show that the binary mixtures which is containing para-toluene sulfonic acid has the most interaction with asphaltene particles to reduce amount of precipitation.
 

کلیدواژه‌ها [English]

  • Asphaltene
  • Mono and Mmulti-Functional Acids
  • Variation of Absorbance
  • UV-vis Spectroscopy
  • Asphaltene Precipitation

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