نهمین کنفرانس بین المللی فناوری و مدیریت انرژی

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کد مقاله icemt9-1261

عنوان Heat Integration of Extractive Distillation Process for the Separation of Azeotropic Mixture of Isopropyl Alcohol and Water

نویسندگان Alireza Arabi - Maedeh Koushkian - Mehdi Orouji - Farideh Bagheri Rafsanjani

چکیده Isopropyl alcohol has many usages in numerous industries, but the azeotrope between it and water must be removed to purify it. So, it is not possible to purify it by normal distillation. In the present article, two processes of Pressure Swing Distillation (PSD) and Extractive Distillation (ED) are used. Via drawing a T-xy mixture diagram at different pressures, it is perceived that the azeotrope point of the mixture does not shift with pressure change. As a result, pressure swing distillation is not an appropriate choice for separating this mixture, but extractive distillation with DMSO solvent can bring isopropyl alcohol to 99% purity. The problem is that the energy consumption of the extractive distillation process is high. That's why the feed-splitting method has been used in this article for the thermal integration of the process. To this end, the input feed to the first column (tower) was divided into two parts and about 53% of it was preheated with the bottom product of the solvent recovery column. The upper part of the feed also enters the column without changing the temperature. The results reveal that the projected method can decrease the amount of hot utility consumption by 20%. The most important reason was the reduction of the heat load of the reboiler of the two columns. Likewise, the amount of cold utility consumption remains almost constant. Since column reboilers work with steam and column condensers work with cool water, and the cost of steam is several times of cool water, the proposed method can meaningfully reduce the operating costs of the process.

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