Heat pump assisted reactive distillation: Wide boiling mixture
Heat pump assisted reactive distillation: Wide boiling mixture
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DOI：
10.1002/aic.12518
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发表时间：
2011-11
期刊：
影响因子：
3.7
通讯作者：
A. Jana;A. Mane
中科院分区：
文献类型：
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作者：
A. Jana;A. Mane
精馏是化工和石油化工中最重要和应用最广泛的分离技术之一。它用于化学工业中约95%的流体分离。1 Diez等人2报告说，化学工业使用的60%的能源用于蒸馏。令人惊讶的是，常规蒸馏的总热效率为约5- 20%。3由于热量利用不当，不仅增加了运行成本，还可能严重影响环境。在工业生产过程的能量转换过程中，产生了烟气、冷凝水、热水、锅炉排污等形式的热排放物，这些热排放物造成了热污染和化石燃料的快速消耗。因此，开发以提高热力学效率为目标的精馏技术已引起了许多研究者的关注。最流行的热耦合技术是内部能量集成4和热泵。2在工业实践中，经常使用机械和吸收式热泵。在前者中，塔顶蒸汽被压缩到较高的压力，并用于加热再沸器中的底部液体，或者底部液体在阀中闪蒸并用于冷凝塔顶蒸汽。在吸收式热泵中，采用一个独立的闭环流体系统，通过混合热将热量传递到温度范围内。如果蒸馏塔的顶部和底部之间的温差很小，并且热负荷很高，则热泵是一种经济的节能方法。为了将这种技术用于宽沸点混合物，可以在中间冷凝器和中间冷凝器之间使用热泵。
Distillation is one of the most important and widely used separation techniques both in chemical and petrochemical industries. It is used for about 95% of all fluid separation in the chemical industry. 1 Diez et al. 2 reported that 60% of energy used by the chemical industry was for distillation. It is surprising that the overall thermal efficiency of a conventional distillation is around 5–20%. 3 Because of the improper utilization of heat, the operating cost is not only increased, the environment could also be severely affected. During the transformation of energy in the industrial processes, the thermal effluents are generated in the form of flue gas, condensate, hot water, boiler blow down, etc. They cause thermal pollution and depletion of fossil fuel at a rapid rate. Therefore, the development of distillation technology aiming to improve the thermodynamic efficiency has captured the attention of many researchers. Most popular techniques of thermal coupling are internal energy integration4 and heat pumping. 2 In industrial practice, mechanical and absorption heat pumps are frequently used. In the former, the overhead vapor is compressed to a higher pressure and used to heat the bottom liquid in the reboiler, or the bottom liquid is flashed in a valve and used to condense the overhead vapor. In absorption heat pumps, a separate closed-loop fluid system is employed to transfer the heat up the temperature scale by means of heat of mixing.Heat pumping is an economic way to conserve energy if the temperature difference between the overhead and bottom of the distillation column is small and the heat load is high. To use this technique for wide boiling mixtures, the heat pump can be employed between the intercondenser and