study of energy saving in petlyuk & multiple-effects arrangements in distillation separation of a ternary mixture (ic5, nc5 and nc6) in compared with conventional prefractionator configuration

There is a possibility of using different arrangements in distillation separation of a three component mixture and one of the most popular arrangements is the pre fractionator configuration. this arrangement like all other distillation columns, consumes high amount of energy. so reduction in energy consumption of this process is needed. in this article, we studied petlyuk and multiple effects arrangements in decreasing required heat duties to separate a three component mixture of iso pentane, normal pentane, and normal hexane and then compared them with the pre fractionator configuration. petlyuk and multiple effects (forward or backward) arrangements are considered as heat integration options in reduction of required heat duties in distillation systems. results show that the forward multiple effects arrangement in compared to petlyuk and backward multiple effects arrangements has about 36.13% and 46.85% energy savings respectively, and therefore it is selected as the best heat arrangement.