Heat integrated distillation apparatus

Patent metadata

Field	Value
Publication number	US-9908060-B2
Application number	US-201313788423-A
Country	US
Kind code	B2
Filing date	Mar 7, 2013
Priority date	Mar 30, 2012
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A distillation apparatus of the present invention includes high-pressure column 1 corresponding to a region above a heat exchanging section located at a lowermost part of a region including a trayed section or a packed bed section, which is used as a rectifying section; and low-pressure column 2 that is located above as seen from high-pressure column 1 , which integrates a region including a trayed section or a packed bed section which is used as a stripping section, with rectifying section corresponding portion 2 g that corresponds to a region locating below the heat exchanging section located at the lowermost part in the rectifying section. Rectifying section corresponding portion 2 g is located on top 2 c of the stripping section in low-pressure column 2 so that rectifying section corresponding portion 2 g continues to the stripping section.

First claim

What is claimed is:

1. A heat integrated distillation apparatus comprising:
a high-pressure column including a trayed section or a packed bed section which constitutes a part of a rectifying section;
a low-pressure column located higher than said high-pressure column and having a first region that includes a trayed section or a packed bed section which constitutes a part of a stripping section and a second region that includes a trayed section or a packed bed section which constitutes another part of the rectifying section, wherein the second region is located on a top portion of the first region in said low-pressure column so that the second region continues to the first region;
a first pipe that connects a column bottom of said high-pressure column with the second region via means that pressure-feeds a liquid held in a column bottom of said high-pressure column to the second region;
a heat exchanger located at a stage in a lower part of said low-pressure column;
two second pipes;
a compressor that is connected with the second region through one of the two second pipes and with said heat exchanger in the lower part of the low-pressure column through the other of the two second pipes so as to compress vapor from the second region and then feed the compressed vapor to said heat exchanger in the lower part of the low-pressure column; and
a third pipe that introduces fluid flowing out from said heat exchanger in the lower part of said low-pressure column to the column bottom of the high-pressure column.

2. The heat integrated distillation apparatus according to claim 1 , further comprising:
a second heat exchanger that is located at a stage locating above a position where said third pipe is connected to the column bottom of said high-pressure column;
a liquid withdrawal section that is located at a stage locating above the lower part of said low-pressure column to which said second pipes are connected, and that removes a part of liquid from the stage to outside the column;
a fourth pipe that introduces the liquid from said liquid withdrawal section to said second heat exchanger; and
a fifth pipe that introduces fluid that passes through said fourth pipe to be introduced into said second heat exchanger and then flows out from the second heat exchanger, to a stage directly below said liquid withdrawal section of said low-pressure column.

3. The heat integrated distillation apparatus according to claim 1 , further comprising a raw material supply pipe that supplies a raw material to the top portion of the first region directly below the second region.

4. The heat integrated distillation apparatus according to claim 1 , further comprising a reboiler that is installed outside the column bottom of said low-pressure column and heats liquid in the column bottom.

5. The heat integrated distillation apparatus according to claim 1 , further comprising a condenser that is placed outside the column top of said high-pressure column and cools vapor in the column top.

Assignees

• Toyo Engineering Corp

Inventors

• Wakabayashi Toshihiro
• Nakao Takato

Classifications

• B01D1/28

  with vapour compression · CPC title

• B01D3/007 Primary

  Energy recuperation; Heat pumps · CPC title

• B01D3/4261

  Side stream · CPC title

• B01D3/322

  Reboiler specifications · CPC title

• B01D3/143

  by two or more of a fractionation, separation or rectification step · CPC title