تعادل شیمیایی و فازی در فرایند استریفیکاسیون استیک اسید با اتانول در حضور دی‌اکسیدکربن فوق ‌بحرانی

نوع مقاله : مقاله ترویجی

نویسندگان
علیرضا پورپروانه 1
محمود محمدی 2
مجید مهدویان 3
ایمان یعقوب خواه 4
1 کارشناس واحد نظارت بر نصب شرکت صنایع پنتان شیمی، تهران، ایران
2 کارشناس ارشد مهندسی شیمی، دانشکدۀ فنی و مهندسی، دانشگاه مهندسی فناوری‌های نوین قوچان، قوچان، خراسان رضوی، ایران
3 استادیار، گروه مهندسی شیمی، دانشگاه مهندسی فناوری‌های نوین قوچان، قوچان، خراسان رضوی، ایران
4 کارشناس HSE، پتروشیمی اروند، منطقۀ ویژۀ اقتصادی ماهشهر، خوزستان، ایران
چکیده
سیالات فوق ‌بحرانی به‌خاطر دارابودن طبیعت قابل‌تنظیمشان کاربردهای بسیاری در استخراج و فرایندهای واکنشی و جداسازی دارند. ازآنجایی‌که کاربردهای سیالات فوق ‌بحرانی در حال افزایش و استفاده از آن‌ها در حال تجاری‌شدن است، فهم بنیانی رفتار فازی این سیالات نیز مورد توجه بیشتری قرار گرفته است. با توجه به دشواری و هزینه‌بر بودن اندازه‌گیری‌های تجربی، با استفاده از مدل‌های ترمودینامیکی می‌توان تعداد داده‌های آزمایشگاهی موردنیاز را برای یک مسئلۀ موردطراحی مشخص کاهش داد. در پژوهش حاضر از مدل‌های درجه‌سوم معادلات حالت به‌همراه قوانین اختلاط استاندارد واندروالس استفاده شده و با استفاده از داده‌های بحرانی مواد، تعادل فازی و شیمیایی برای فرایند استریفیکاسیون استیک اسید با اتانول در حضور CO2 فوق ‌بحرانی مورد مطالعه قرار گرفت. با توجه به نتایج می‌توان گفت که هر دو مدل SRK و PR برای پیش‌بینی فرایند شامل CO2 فوق ‌بحرانی به‌خوبی عمل نموده‌اند. هر دو مدل وجود دو فاز مایع و گاز نسبتاً متراکم را در شرایط موردبررسی ۳۳۳K و bar ۵۸/۶ پیش‌بینی نموده‌اند که با نتایج تجربی کاملاً مطابقت دارد. مقادیر ثابت تعادلی به‌دست‌آمده توسط هر دو مدل در دو دما نیز در بیشترین حالت 4درصد با مقادیر تجربی اختلاف داشته‌اند.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Chemical and Phase Equilibria in the Process of Esterification of Acetic Acid with Ethanol in the Presence of Supercritical Carbon Dioxide

نویسندگان English

Ali Reza Pour Parvaneh 1
Mahmood Mohammadi 2
Majid Mahdavian 3
Iman Yaghoub Khah 4
1 Installation Supervisor, Pentan Chemical Company, Tehran, Iran
2 MSc in Chemical Engineering, Faculty of Engineering, Quchan University of New Technologies Engineering , Quchan, Iran
3 Assistant Professor, Department of Chemical Engineering, Quchan University of New Technologies Engineering, Quchan, Iran
4 HSE Expert, Arvand Petrochemical, Mahshahr Special Economic Zone
چکیده English

Due to their adaptable nature, supercritical fluids have many applications in extraction, separation and reactive processes. Since the applications of supercritical fluids are being commercialized and their use is increasing, a profound understanding of the phasic behavior of these fluids is receiving attention. Due to the difficult and costly experimental measurements, using thermodynamic models can reduce the number of needed experimental data for a particular design. In this paper, cubic standard equations of state with the Van Der Waals mixing rules and materials critical data was used to study chemical and phase equilibria for the esterification of acetic acid with ethanol in the presence of supercritical CO2. The results show that both SRK and PR models successfully predicts processes containing supercritical CO2. Both models relatively have predicted two dense gas and liquid phases in 333 K and 58.6 bar condition, which is in line with experimental results. The equilibrium constants obtained from both models in 355 & 358 K had up to 4% difference with experimental values.

کلیدواژه‌ها English

Chemical Equilibria
Phase Equilibria
Esterification. Acetic Acid
Ethanol
Supercritical CO2
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  • تاریخ دریافت 04 اردیبهشت 1401