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بررسی تاثیرات دمایی پیرولیز بر ضرایب نفوذ اکسیژن و نیتروژن در غربالهای مولکولی کربنی | ||
| مدل سازی در مهندسی | ||
| مقاله 6، دوره 12، شماره 37، شهریور 1393، صفحه 77-87 اصل مقاله (770.75 K) | ||
| شناسه دیجیتال (DOI): 10.22075/jme.2017.1673 | ||
| نویسندگان | ||
| الهه کیاپاشا1؛ منصور جهانگیری* 1؛ محمد مهدیارفر2 | ||
| 1دانشگاه سمنان | ||
| 2پژوهشگاه صنعت نفت تهران | ||
| تاریخ دریافت: 09 بهمن 1395، تاریخ بازنگری: 02 مهر 1396، تاریخ پذیرش: 09 بهمن 1395 | ||
| چکیده | ||
| جدا سازی و تخلیص گازها یکی از مهمترین فرایندهای صنعتی می باشد. در این مقاله، جذب و نفوذ اکسیژن و نیتروژن از میان جاذب های غربال مولکولی کربنی (CMS) که از پیرولیز رزین فنولی در سه دمای مختلف ℃ 500، ℃ 700 و ℃800 ساخته شده، مورد مطالعه قرار گرفت. نفوذ میکروپور اکسیژن و نیتروژن در این سه جاذب با کمک روش حجم سنجی در دستگاه جذب ناپیوسته، با استفاده از معادله نفوذ شامل حالتهای زمان کوتاه و زمان طولانی، روش LDF و معادله ورمولن بررسی شد. نتایج نشان داد که داده های بدست آمده در کار حاضر با داده های حاصل از معادله نفوذ در حالت زمان طولانی، روش LDF و معادله ورمولن همخوانی مناسبی داشته و تقریب مناسبی از ثابت زمانی نفوذ را ارائه می کنند. همچنین مقایسه ثابت زمانی نفوذ اکسیژن و نیتروژن در دماهای مختلف پیرولیز، نشان داد که ثابت زمانی نفوذ، با افزایش دمای پیرولیز تا ℃700، روند افزایشی دارد ولی تا دمای ℃800 کاهش می یابد. برای اکسیژن نیز ثابت زمانی نفوذ با افزایش دمای پیرولیز تا ℃700، افزایش زیادی از خود نشان می دهد و در ادامه تا دمای ℃800 این روند افزایشی، ادامه دارد | ||
| کلیدواژه‌ها | ||
| نفوذ میکروپور؛ جذب ناپیوسته؛ جاذب غربال مولکولی کربنی؛ روش LDF؛ معادله ورمولن | ||
| عنوان مقاله [English] | ||
| Investigation of pyrolysis temperature effects on diffusion coefficients of oxygen and nitrogen in carbon molecular sieve | ||
| چکیده [English] | ||
| Separation and purification of gases is the most important industrial processes. In this article, adsorption and diffusion of oxygen and nitrogen through carbon molecular sieve (CMS) were investigated. CMS were made by pyrolysis of phenolic resin at three different temperatures, 500, 700 and 800â . Micro pore diffusion of oxygen and nitrogen into the CMS adsorbents were studied by volumetric method in batch adsorption unit. The diffusion data were yield from the batch system can be modeled by homogeneous diffusion (long and short time) equation, LDF method and Vermeulen model. The results showed that data of this work were in good agreement with diffusion equation (long time), LDF method and Vermeulen model. Therefore, they could give accurate estimation diffusion time constants of O2 and N2. Also, a comparison of diffusion time constants (DTC) of Oxygen and Nitrogen for different pyrolysis temperatures showed that the DTC of O2 and N2 increase with temperature increasing up to 700 â and decrease with temperature rising to 800â. In addition, DTC of O2 increase over the temperature range, 500â to 800â. | ||
| کلیدواژه‌ها [English] | ||
| Micro pore diffusion, Batch adsorption, Carbon molecular sieve, LDF method, Vermeulen model | ||
| مراجع | ||
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