بررسی رفتار خوردگی فولاد کربنی و فولاد زنگ نزن 316 در محلول aMDEA مورد استفاده در فرایند جذب/دفع دی‌اکسید کربن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان

2 واحد تحقیق و توسعه، شرکت پالایش نفت اصفهان

3 دانشکده علوم پایه بخش شیمی، دانشگاه تربیت مدرس

چکیده

یکی از چالش‌های مطرح در واحد شیرین‌سازی گاز در پالایشگاه‌ها، خوردگی اجزاء در محلول آمین در چرخش در طی فرایند حذف CO2 است. از این‌رو در پژوهش حاضر، آزمون‌های الکتروشیمیایی (پلاریزاسیون تافل و طیف‌سنجی امپدانس الکتروشیمیایی) جهت بررسی رفتار خوردگی فولادهای کربنی و زنگ نزن 316 در محلول‌ متیل دی‌اتانول آمین فعال شده با پپرازین موجود در فرایند جذب/دفع CO2 واحد تولید هیدروژن پالایشگاه اصفهان شامل جذب‌کننده (Rich)، ریژنراتور (Lean) و نیز محلول تازه ساخته شده، به‌کار گرفته شدند. آزمون ها در دمای ثابت 65 درجه سانتی‌گراد انجام شدند. در غیاب CO2، رفتار پاسیو برای هر دو فولاد کربنی و زنگ نزن 316 مشاهده شد. کمترین مقاومت به خوردگی این فولادها در محلول Rich مشاهده شد که به‌دلیل کمترین مقدار pH و بیشترین مقدار هدایت ویژه این محلول در مقایسه با محلول‌های Lean و تازه ساخته شده بود. با دمش گاز CO2 در دمای 65 درجه سانتی‌گراد، خوردگی فولاد کربنی به‌صورت اکتیو در آمد درحالی‌که رفتار پاسیو فولاد زنگ نزن 316 حفظ شد. هر دو فولاد مقاومت به خوردگی کمتری را در محلول Rich ارائه دادند. 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of the Corrosion Performance of Carbon Steel and 316 Stainless Steel in aMDEA Solution Uused in the CO2 Absorption/Desorption Process

نویسندگان [English]

  • F. Adel-Mehraban 1
  • R. Saeidi 1
  • M. Moradmand 2
  • M. Zhiani 3
  • K. Raeissi 1
1 Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
2 R&D Center, Isfahan Oil Refinery Co., Isfahan, Iran
3 Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-111, Tehran, Iran
چکیده [English]

One of the major challenges in natural gas sweetening plants is the corrosion of components in amine solution during the CO2 removal process. In this study, electrochemical tests (Tafel polarization and electrochemical impedance spectroscopy) were employed to evaluate the corrosion performance of carbon steel and stainless steel 316 in the aMDEA solution present in the CO2 absorption/desorption process of hydrogen generation unit in Isfahan refinery, including the absorber (rich) and regenerator (lean), as well as freshly made solution. The tests were performed at a constant temperature of 65 °C. Passive behavior was observed for both carbon and 316 stainless steels in the absence of CO2. The lowest corrosion resistance of these steels was observed in the rich solution due to the lowest pH and the highest specific conductivity compared to the lean and freshly made solutions. The carbon steel corroded actively by the purging of CO2 at a temperature of 65 °C while the passive behavior of 316 stainless steel was maintained. Both steels exhibited lower corrosion resistance in the rich solution.

کلیدواژه‌ها [English]

  • aMDEA solution
  • Corrosion
  • Passivation
  • Carbon steel
  • 304 stainless steel
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