Patent ID: 9205346
Filing Date: 2015-12-08
Classification: B01D

Abstract:
1. A method for controlling a distillation apparatus which comprises a high-pressure part comprising the whole or a part of a rectifying section and configured to perform gas-liquid contact at a relatively high pressure; a low-pressure part comprising the whole or a part of a stripping section and configured to perform gas-liquid contact at a relatively low pressure; a line for directing an overhead vapor of the low-pressure part to a column bottom of the high-pressure part; a line for directing a column bottom liquid of the high-pressure part to a column top of the low-pressure part; and a heat exchange structure configured to transfer heat from the rectifying section to the stripping section, wherein the method comprises controlling a flow rate of the column bottom liquid directed from the high-pressure part to the low-pressure part at a predetermined target value which is adjusted so that an impurity concentration in a bottom product or a distillate product is to be a predetermined value or less.