اندازه‌گیری میزان گاز مصرفی در فرآیند تشکیل هیدرات کربن‌دی‌اکسید در سیستم آب+ کربن‌دی‌اکسید+ تترا ان بوتیل آمونیوم فلوراید

نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه بجنورد، ایران

2 گروه مهندسی شیمی، دانشگاه آزاد اسلامی، واحد امیدیه، ایران

3 گروه مهندسی شیمی، دانشگاه آزاد اسلامی، واحد ماهشهر، ایران

چکیده

گاز کربن‌دی‌اکسید یکی از شش گاز گلخانه‌ای مورد هدف پیمان کیوتو است که سهم زیادی در گرمایش زمین دارد. بنابراین جذب این گاز و ممانعت از ورود آن به جو زمین بسیار مهم است. تکنولوژی هیدرات‌های گازی یکی از جدیدترین روش‌های جذب این گاز است. اما سینتیک کند تشکیل هیدرات یکی از مهم‌ترین موانع صنعتی شدن این فرآیند است. در این مقاله، دو مورد از مهم‌ترین پارامترهای سینتیکی تشکیل هیدرات یعنی تعداد مول‌های گاز مصرفی و زمان القای تشکیل هیدرات گازی در سیستم‌های آب+ کربن‌دی‌اکسید و آب+ تترا ان-بوتیل آمونیوم فلوراید(TBAF) + کربن‌دی‌اکسید اندازه‌گیری و بررسی شد. استفاده از TBAF به میزان قابل توجهی زمان القای تشکیل هیدرات را کاهش داد. به طوری که استفاده از 5% وزنی از این افزودنی در دمای K 15/278 و فشار MPa 8/3، زمان القا را از min 73 به min 9/0 کاهش داد. تعداد مول‌های کربن‌دی‌اکسیدمصرفی در طول فرآیند تشکیل هیدرات و در زمان‌های min 40 و min 350 پس از شروع فرآیند تشکیل هیدرات اندازه‌گیری و محاسبه شد. استفاده از TBAF تعداد مول‌های گاز مصرفی را به میزان قابل ملاحظه‌ای افزایش داد به طوری که استفاده از 1، 4 و 5% وزنی از TBAF تعداد مول‌های گاز مصرفی را در زمان min 40 پس از شروع فرآیند تشکیل هیدرات به‌ترتیب 5/18%، 3/39% و 9/71% افزایش داد.
 

کلیدواژه‌ها


عنوان مقاله [English]

The Amount of Gas Consumed in the Process of Hydrate Formation for the Systems of Water + Carbon Dioxide and Water + TBAF + Carbon Dioxide

نویسندگان [English]

  • Abolfazl Mohammadi 1
  • Mehrdad Pakzad 2
  • Alireza Azimi 3
1 Department of Chemical Engineering, University of Bojnord, Iran
2 Department of Chemical Engineering, Omidiyeh Branch, Islamic Azad University, Omidiyeh, Iran
3 Department of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran
چکیده [English]

According to Kyoto protocol, carbon dioxide is one of the six large greenhouse gases which causes global warming. Therefor it is very important to prevent it from entering the atmosphere. The  gas hydrate technology is one of the newest methods of carbon dioxide separation, but slow kinetics of this technology is one of the major obstacles to industrialize the process. The induction time of carbon dioxide hydrate formation and the amount of gas have been consumed for the systems of water + carbon dioxide and water + TBAF + carbon dioxide were measured in this research. The experiments were done in a 169 cm3 batch reactor and at temperature 278.15 K and initial pressure 3.8 MPa. Utilization of 5 wt% TBAF decreases the induction time of hydrate formation from 73 min to 0.9 min. The amount of carbon dioxide consumed within 40 min and 350 min of experiments was measured and reported. Utilization of 1, 4, and 5 wt% TBAF within 40 min of experiments increase the amount of carbon dioxide consumed 18.5% ,39.3%, and 71.9%, respectively.
 

کلیدواژه‌ها [English]

  • Carbon Dioxide
  • Kinetics
  • Semiclathrate Hydrates
  • TBAF
  • Induction Time

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