Process and plant for recovering acrylic acid

Patent metadata

Field	Value
Publication number	US-10343969-B2
Application number	US-201715615852-A
Country	US
Kind code	B2
Filing date	Jun 7, 2017
Priority date	Sep 30, 2014
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

A plant ( 1 ) for recovering acrylic acid, which includes: a absorption column ( 201 ); a dissociation column ( 205 ); a first line ( 101 ) connected to the dissociation column ( 205 ); a second line ( 102 ) connecting the absorption column ( 201 ) and the dissociation column ( 205 ); a third line ( 103 ) feeding a substream of the mother acid obtained in the crystallization into the dissociation column ( 205 ); a fourth line ( 104 ) connecting the crystallization apparatus and the absorption column ( 201 ); and a fifth line ( 105 ) connecting the dissociation column ( 205 ) and the absorption column ( 201 ).

First claim

The invention claimed is:

1. A plant for recovering acrylic acid, which comprises:
an absorption column;
a dissociation column;
a crystallization apparatus;
a first line connected to the dissociation column;
a second line connecting the absorption column and the dissociation column;
a third line feeding a substream of a mother acid obtained from crystallization in the crystallization apparatus directly into the dissociation column;
a fourth line feeding a stream of the mother acid directly from the crystallization apparatus, which splits into a feed line feeding a substream of the mother acid directly into the absorption column and the third line; and
a fifth line connecting the dissociation column d the absorption column.

2. The plant according to claim 1 , further comprising:
a quenching apparatus for quenching a product gas mixture comprising acrylic acid, which is arranged in the fifth line between the dissociation column and the absorption column.

3. The plant according to claim 1 , wherein the plant is integrated into an overall plant for preparing acrylic acid.

4. The plant according to claim 1 , wherein the third line directly feeds an uppermost tray of the dissociation column.

5. The plant according to claim 1 , wherein the first line feeds the dissociation column at a position below a lowermost tray of the dissociation column.

6. The plant according to claim 1 , wherein the second line feeds a middle tray of the dissociation column.

Assignees

• Basf Se

Inventors

• Hammon Ulrich
• Walter Thomas
• Ottenbacher Markus
• Huetten Frank

Classifications

• B01J19/24

  Stationary reactors without moving elements inside (B01J19/08, B01J19/26 take precedence; with stationary particles B01J8/02) · CPC title

• C07C57/04

  Acrylic acid; Methacrylic acid · CPC title

• C07C51/48

  by liquid-liquid treatment · CPC title

• C07C51/487 Primary

  by treatment giving rise to chemical modification (by chemisorption C07C51/47) · CPC title

• B01J2219/24

  Stationary reactors without moving elements inside · CPC title