Distillation apparatus
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United States of America Patent
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Dec 26, 2017
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app pub date -
Nov 20, 2014
filing date -
Nov 21, 2013
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Abstract
A distillation apparatus includes a first distillation column and one or more second distillation columns. A higher-pressure part of the first distillation column includes at least part of a rectifying section, and performs gas-liquid contact at a relatively high pressure. A lower pressure-part of the first distillation column includes at least part of a stripping section and performs gas-liquid contact at a relatively low pressure. A vapor line, which includes a pressurizing means, directs a vapor discharged from a column top of the lower-pressure part to a column bottom of the higher-pressure part. A liquid line directs a liquid discharged from the column bottom of the higher-pressure part to the column top of the lower pressure part. Corresponding heat exchange structures transfer heat in both directions between the rectifying section of the first distillation column and at least one second distillation column.
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