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Separator, reactor, and method for producing aromatic carboxylic acids

a technology of aromatic carboxylic acid and separation chamber, which is applied in the preparation of carboxylic compounds, separation processes, refrigeration components, etc., can solve the problems of complex dehydration/distillation steps, poor heat resistance, and insufficient streamlined methods disclosed in these references, so as to reduce the size of the system and reduce the energy consumption

Inactive Publication Date: 2007-09-13
SEIKI YOSHIO +7
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] Further, because it is an effective means for minimizing the loss of an acetic acid solvent to reuse methyl acetate in the oxidation reaction step, the consumption of acetic acid will increase if alcohol is discharged out of the system by hydrolyzing an aliphatic carboxylic acid ester, as disclosed in patent document 5.
[0045] According to the present invention, it is possible to reduce the size of systems for recovering solvents such as distillation columns and to reduce the energy consumed.

Problems solved by technology

This complicates the dehydration / distillation steps.
The methods disclosed in these references are therefore not sufficiently streamlined.
But organic high-molecular membranes, which are typically used as acid-resistant separator membranes that can selectively separate water from an aqueous solution containing organic acids, have a drawback in that their heat resistance is so poor that they can be used only at relatively low temperatures.
This requires additional energy consumption.

Method used

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  • Separator, reactor, and method for producing aromatic carboxylic acids
  • Separator, reactor, and method for producing aromatic carboxylic acids
  • Separator, reactor, and method for producing aromatic carboxylic acids

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0071]FIG. 1 shows Embodiment 1 of the present invention, which is a separation system for separating a solution of a mixture of water and acetic acid.

[0072] Typically, the separation system of Embodiment 1 is used to remove water produced by oxidation reaction when producing a terephthalic acid by oxidizing, in a liquid phase, a paraxylene as the raw material using air in a reaction solvent containing acetic acid in the presence of an oxidation catalyst.

[0073] The separation system of Embodiment 1 includes a distillation column 1 having a plurality of fluidized beds such as shelves in the interior thereof. To an upper portion of the column, 78 weight percent of a liquid-phase aqueous solution of acetic acid (liquid-phase feed) is supplied through an upper supply pipe 2, and to a lower portion of the column, 87 weight percent of an aqueous solution of acetic acid and a small amount of nitrogen are supplied as a vapor-phase feed through a lower supply pipe 3. Thus, a mixture of the...

embodiment 2

[0096]FIG. 2 shows Embodiment 2 of the present invention, which is a separation system for separating a solution of a mixture of water and acetic acid.

[0097] Like the system of Embodiment 1, the system of Embodiment 2 is typically used to remove water produced by oxidation reaction when producing a terephthalic acid by oxidizing, in a liquid phase, a paraxylene as the raw material using air in a reaction solvent containing acetic acid in the presence of an oxidation catalyst.

[0098] Like the system of Embodiment 1, the system of Embodiment 2 includes a distillation column 41 having a plurality of fluid beds such as shelves in the interior thereof. To an upper portion of the column, 78 weight percent of a liquid-phase aqueous solution of acetic acid (liquid-phase feed A) is supplied through an upper supply pipe 42, and to a lower portion of the column, 87 weight percent of an aqueous solution of acetic acid and a small amount of nitrogen are supplied as a vapor-phase feed B through ...

embodiment 3

[0124]FIG. 3 shows Embodiment 3, which is a reactor system for synthesizing terephthalic acid according to the present invention.

[0125] This reactor system includes a reactor 81 filled with an oxidation catalyst for paraxylene (such as a cobalt compound). To the reactor 81, a raw material supply pipe 82 is connected through which paraxylene as the raw material, an acetic acid solvent, and an oxidation catalyst are supplied into the reactor. To the top of the reactor 81, a reaction vapor discharge pipe 83 is connected through which reaction vapor produced in the reactor is discharged. Air as an oxidant is supplied into the reactor 81 through an oxidant supply pipe 101.

[0126] To the reaction vapor discharge pipe 83, a first separator 84 including a first separation membrane 84a is connected. The first separation membrane 84a is identical to the separation membrane 8a of Embodiment 1. Thus, it passes a first component which mainly comprises steam, but does not pass a second component...

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Abstract

In a process for producing an aromatic carboxylic acid, it is a dehydrating process which can achieve compactification of a step for removing water from a mixture of acetic acid and water produced in the production process, and which can reduce the consumed energy. In a production process of an aromatic carboxylic acid having an oxidation reaction step for producing a slurry of an aromatic carboxylic acid by carrying out liquid-phase oxidation reaction of an alkyl aromatic compound with an oxygen-containing gas in a solvent containing acetic acid in the presence of an oxidation catalyst, at least a portion of a mixture containing acetic acid and water produced in the production steps is separated into a permeable gas mainly comprising water and nonpermeable substances mainly comprising acetic acid, using a separation membrane having water selectivity.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for producing an aromatic carboxylic acid by subjecting alkyl substituents or a partially oxidized aromatic alkyl compound to liquid-phase oxidation using an oxygen-containing gas, and a reactor used in this method. BACKGROUND ART [0002] Aromatic carboxylic acids are usually produced in an oxidation reactor by subjecting alkyl aromatic compounds as raw materials to liquid-phase oxidation in a solvent containing acetic acid in the presence of a catalyst containing a heavy metal compound and a bromine compound by use of a gas containing oxygen in the form of molecules. During this oxidizing reaction, water is produced. Reaction vapor discharged from the oxidation reactor and a mother liquid of aromatic carboxylic acid slurry contain reaction water. Such reaction vapor and mother liquid, the latter being obtained by separating aromatic carboxylic acids from the slurry produced, are typically dehydrated and distilled to re...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07C51/16B01D1/28B01D3/14B01D3/42B01D53/26B01J8/00C07C51/265C07C51/44C07C51/47
CPCB01D3/14B01D3/143C07C51/47C07C51/44C07C51/265B01J2219/00006B01J8/009B01D3/4205B01D53/268C07C63/26Y10S159/27Y10S159/28Y10S159/03
Inventor SEIKI, YOSHIOKOBAYASHI, KAZUTOTAKEUCHI, YOSHIYUKIOSORA, HIROYUKIAKIMOTO, KEIICHIMATSUMOTO, NORITAKANUMATA, MOTOKISHIMAZU, HIROAKI
Owner SEIKI YOSHIO
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