Abstract

Optimization criteria are proposed for processes of separating ethylene and propylene from a mixture of low-boiling gases. These criteria are based on the physicochemical properties of substances and take into account special techniques used for separating such mixtures. Unlike the existing criteria based on considering the heat input to the reboiler and the heat output from the condenser of a distillation column, these optimality criteria more accurately evaluate the economic performance of the process, because they include the refrigerant preparation cost, which plays a decisive role in separating low-boiling gases. Four known methods of separating mixtures of low-boiling gases are considered: (A) separation in a column with steam as the heat-transfer medium in the column reboiler and with a refrigerant in the condenser, (B) separation in a column with the condensation of the vapor of a refrigerant in the column reboiler and with the same refrigerant in the condenser, (C) separation in a column with the condensation of the vapor of the ith refrigerant in the column reboiler and with the jth refrigerant in the condenser, and (D) separation in a column with steam as a heat-transfer medium in the column reboiler and with recirculating water in the condenser. Parameters that are expediently used as optimality criteria are identified. New approaches to creating the optimal processes of separating low-boiling gases are developed and theoretically justified for further implementation.

中文翻译：

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制定低沸点气体分离工艺的优化标准

摘要

为从低沸点气体混合物中分离乙烯和丙烯的方法提出了优化标准。这些标准基于物质的物理化学性质，并考虑到用于分离此类混合物的特殊技术。与基于考虑再沸器的热量输入和蒸馏塔冷凝器的热量输出的现有标准不同，这些最优标准可以更准确地评估过程的经济性能，因为它们包括制冷剂的制备成本，这对决定性因素起着决定性的作用。在分离低沸点气体中的作用。考虑了四种已知的分离低沸点气体混合物的方法：（A）在塔中进行分离，在塔再沸器中用蒸汽作为传热介质，在冷凝器中用制冷剂进行分离，在塔再沸器中的第i种制冷剂和在冷凝器中的第j种制冷剂，以及（D）在塔中分离，其中蒸汽作为塔式再沸器中的传热介质，在冷凝器中循环水。确定方便地用作最优标准的参数。开发了创建分离低沸点气体最佳工艺的新方法，并在理论上证明了进一步实施的合理性。