بررسی اثر فشار بر زمان القا و میزان مول‌های متان جذب شده در فرآیند تشکیل هیدرات شبه کلاتریت در سیستم آب + TBAC+ متان

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

زمان القا و میزان مصرف گاز دو مشخصه مهم در بررسی‌های سینتیکی تشکیل هیدرات‌های گازی هستند. در کار حاضر این دو مشخصه سینتیکی در فرآیند تشکیل هیدرات در سیستم‌های آب+ متان و آب + متان + تترا ان- بوتیل آمونیوم کلراید (TBAC) بررسی شد. آزمایش‌های سینتیکی مورد نظر در حضور سه محلول آبی با غلظت‌های 0، 3 و 5% از TBAC و در دمای K 15/278 و دو فشار (5/6 و MPa 8) انجام شد. نتایج آزمایش‌های انجام شده نشان داد استفاده از TBAC زمان القای تشکیل هیدرات متان را به‌میزان قابل توجهی کاهش می‌دهد. به‌طوری‌که استفاده از از 5% از این نمک در فشار MPa 8، زمان القا را از min 437 به min 3 کاهش داد. همچنین حضور TBAC باعث افزایش مقدار مصرف گاز متان در فرآیند تشکیل هیدرات در min 700 ابتدایی فرآیند شد. استفاده از 3% از TBAC در فشار MPa 8 میزان مصرف گاز را 09/47% نسبت به آب خالص افزایش داد. بررسی های انجام شده بر‌روی اثر فشار بر زمان القا و میزان مصرف گاز در سیستم آب+ متان + TBAC نشان داد با افزایش فشار از 5/6 تا MPa 8، زمان القای تشکیل هیدرات کاهش و میزان مصرف گاز متان افزایش می‌یابد. به‌طوری‌که در محلول با غلظت 3% از TBAC زمان القا از min 41 به min 12/4 کاهش و میزان مصرف گاز از 98/20 به mmol/mol of solution 29/28 افزایش یافت.
 

کلیدواژه‌ها


عنوان مقاله [English]

The Effect of Pressure on Induction Time and the Amount of Methane Consumed During Hydrate Formation Process for the System of Water + TBAC + Methane

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]

Induction time and the amount of gas consumed, two important kinetic parameters in gas hydrate formation process, were investigated for the systems of water + methane and water + TBAC + methane, in this research. In order to study the effect of TBAC on the kinetics of methane hydrate formation, three aqueous solutions of TBAC with concentrations of (0, 3, and 5) wt% were prepared. The experiments were carried out (or done) in a 169 cm3 batch reactor and at a temperature of 278.15 K and initial pressures of (6.5 and 8) MPa. The results showed that adding TBAC decreases the induction time of hydrate formation process. The utilization of TBAC with concentration of 3 wt% at 8 MPa decreases the induction time from 437 min to 3 min and increases the amount of gas consumed during hydrate formation %47.09, compared to pure water. The experimental results showed that by increasing the pressure form 6.5 MPa to 8 MPa, the induction time of methane hydrate formation decreases, and the amount of methane consumed increases. In addition, by increasing the pressure form 6.5 MPa to 8 MPa in aqueous solution of TBAC with concentration of 3 wt%, the induction time decreases from 41 min to 4.12 min and the amount of methane consumed increases from 20.98 mmol/mol of solution to 28.29 mmol/mol of solution

کلیدواژه‌ها [English]

  • Gas Hydrates
  • Semiclathrate Hydrates
  • TBAC
  • Induction Time, Kinetics

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