Patent ID: 9194623
Filing Date: 2015-11-24
Classification: B01D,F25J

Abstract:
1. A distillation apparatus comprising: a distillation column group in which a plurality of distillation columns, which are respectively equipped with a reboiler, are connected in the form of a distillation cascade; feed-gas condensers which liquefy feed gases from bottoms of respective former distillation columns and feed said liquefied feed gases to tops of respective latter distillation columns; gas-feeding lines which connect the bottoms of the respective former distillation columns and the respective feed-gas condensers; liquid-feeding lines which connect the respective feed-gas condensers and the tops of the respective latter distillation columns; top-gas condensers provided on the tops of the respective distillation columns; top-gas lines which introduce gases from the tops of the respective distillation columns to the respective top-gas condensers; liquid lines which withdraw condensate liquids from the respective top-gas condensers; liquid-reflux lines which introduce the condensate liquids from the respective liquid lines to the tops of the respective distillation columns; and liquid-return lines which return parts of the condensate liquids from the respective liquid lines to the bottoms of the respective former distillation columns.