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Extraction process for removal of impurities from mother liquor in the synthesis of carboxylic acid

A technology of mother liquor and carboxylic acid, which is applied in the separation/purification of carboxylic acid compounds, preparation of carboxylate salts, chemical instruments and methods, etc., can solve problems such as incompatibility

Active Publication Date: 2005-02-02
GRUPO PETROTEMEX SA
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  • Claims
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AI Technical Summary

Problems solved by technology

Typical levels of impurities in crude TPA make it unsuitable for direct use in most polymer applications

Method used

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  • Extraction process for removal of impurities from mother liquor in the synthesis of carboxylic acid

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Embodiment Construction

[0036] In one embodiment of the invention, as figure 1 As shown, a method for recovering metal catalysts from mother liquor 101 is provided. The method includes the following steps.

[0037] Step (a) comprises evaporating mother liquor 101 containing carboxylic acid, said metal catalyst, impurities, water and solvent in first evaporation zone 121 to produce vapor stream 104 and concentrated mother liquor stream 105 .

[0038] The mother liquor 101 is discharged from the carboxylic acid oxidation synthesis process. The mother liquor 101 is used as a feed stream in the process of the present invention. The mother liquor contains carboxylic acid, water, solvent, said metal catalyst and impurities. The impurities include organic bromides and corrosion metals. The organic bromide is used as a cocatalyst for the oxidation reaction. Examples of corrosive metals are iron and chromium compounds which inhibit, reduce or completely destroy the activity of metal catalysts.

[0039] ...

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Abstract

A method for removing impurities from a mother liquor comprising a carboxylic acid, a metal catalyst, impurities by (a) evaporating the mother liquor comprising a carboxylic acid, the metal catalyst, impurities, water and a solvent in a first evaporator zone to produce a vapor stream and a concentrated mother liquor stream;(b) evaporating the concentrated mother liquor stream in a second evaporator zone to form a solvent rich stream and a super concentrated mother liquor stream;(c) separating organic impurities with a water-solvent solution from the super concentrated mother liquor in a solid-liquid separation zone to form an aqueous stream and a second aqueous stream; (d) mixing in a mixing zone water and optionally and extraction solvent with the aqueous stream and second aqueous stream to form an aqueous mixture; and (e) adding an extraction solvent to the aqueous mixture in an extraction zone to form an extract stream and a raffinate stream.

Description

technical field [0001] This invention relates to a process for the recovery of metal catalysts from mother liquors produced in the synthesis of carboxylic acids, typically terephthalic acid. More specifically, the process comprises adding water to an ultra-concentrated mother liquor stream to recover the metal catalyst, and then subjecting the aqueous mixture so formed to a single-stage extraction to remove organic impurities to obtain an extract stream and a raffinate stream containing the metal catalyst . Background technique [0002] Industrially, terephthalic acid is produced by oxidizing p-xylene in the presence of a catalyst such as Co, Mn, Br and a solvent. Terephthalic acid used in the manufacture of polyester fibers, films and resins must undergo further treatment to remove impurities present due to the oxidation of p-xylene. [0003] Terephthalic acid (TPA) is an intermediate in the polyester production process used in plastics and fiber applications. The indust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/00B01J23/92B01J38/04B01J38/06C07C51/42C07C51/48
CPCC07C51/42Y10S423/14C07C51/48Y02P20/52C07C63/26B01J38/06B01J38/04
Inventor 林鑫
Owner GRUPO PETROTEMEX SA
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