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Process for recovering aromatic monocarboxylic acids

A monocarboxylic acid and aromatic technology, applied in the separation/purification of carboxylic acid compounds, carboxylate preparation, chemical instruments and methods, etc., can solve the problems of benzoic acid production loss and other issues

Pending Publication Date: 2021-07-16
INVISTA TEKSTAJLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This constitutes a significant loss of production of valuable benzoic acid and constitutes a significant effluent treatment requirement

Method used

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  • Process for recovering aromatic monocarboxylic acids
  • Process for recovering aromatic monocarboxylic acids
  • Process for recovering aromatic monocarboxylic acids

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0103] An artificial aqueous feed (500 g) was prepared to simulate the aqueous phase from the solids extraction step, i.e. from step (iii) / (III) of the process of the invention (in other words, from Comparative Example 1 and figure 1 The composition of stream 9). The feed was heated to 80°C and any undissolved solids were filtered off.

[0104] The filtrate was then mixed with hot toluene (200 g). Samples of the aqueous and organic layers were taken at regular intervals and analyzed by HPLC for mass transfer of benzoic acid and p-toluic acid from the aqueous phase to the organic phase. These data are shown in Image 6 and Figure 7 middle. The data show the extraction in organic liquid of organic by-products derived from the aqueous stream of the solids extraction step.

[0105] The water:toluene weight ratio in the above experiments was 1.9. In practice, the amount of water present may vary depending on the amount of water added to the residue and the amount of water us...

example 2

[0107] The first experiment simulated a process with a water:toluene weight ratio of 0.92. The results are shown in Figure 8 and Figure 10 middle.

example 3

[0109] A second experiment simulated a process with a water:toluene weight ratio of 6. The results are shown in Figure 9 and Figure 11 middle.

[0110] The recovery data for benzoic acid and p-toluic acid in each of the experiments of Examples 1 to 3 showed that the extraction was complete within 30 seconds. These 30 seconds consisted of 15 seconds mixing and 15 seconds standing, so it can be concluded that a simple inline mixer with a 15 second residence time followed by a decanter would be more than sufficient to complete the extraction.

[0111] Under normal conditions (instance 1), 70% benzoic acid ( Image 6 ) and 90% p-toluic acid ( Figure 7 ). Thus, combined with the single stage solids extraction of Comparative Example 1, this equates to a total recovery over two steps of approximately 94% benzoic acid and 68% p-toluic acid.

[0112] At reduced water content (Example 2), the benzoic acid recovery was raised to approximately 80% ( Figure 8 ), while at increas...

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Abstract

The present invention provides methods and apparatus for recovering aromatic monocarboxylic acids from a residue stream wherein a first solid extraction is performed first and a second extraction is performed later.

Description

[0001] This application is a branch of an application whose international filing date is August 12, 2015, international application number is PCT / EP2015 / 068593, national application number is 201580043210.1, and the title of the invention is "Method for recovering aromatic monocarboxylic acid" Application. technical field [0002] This invention relates to methods and apparatus for recovering aromatic monocarboxylic acids from residue streams. Background technique [0003] Aromatic polycarboxylic acids are generally produced by the liquid phase oxidation of alkyl-substituted aromatic starting materials, usually methyl-substituted benzene and naphthalene starting materials, where the methyl substituents are positioned in the desired final The position of the formic acid substituent in the product corresponds. For example, terephthalic acid (TA), which is widely used in polyester manufacture, is synthesized by using a bromine-promoted catalyst containing cobalt and manganese ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/48C07C63/06C07C51/47C07C51/265C07C63/26
CPCC07C51/265C07C51/47C07C51/48B01J2219/00006C07C63/06C07C63/26
Inventor N.奎利C.H.杰克逊
Owner INVISTA TEKSTAJLS