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

A mother liquor and carboxylic acid technology, applied in the separation/purification of carboxylic acid compounds, carboxylate salt preparation, organic chemical methods, etc., can solve problems such as inappropriate

Active Publication Date: 2005-02-02
GRUPO PETROTEMEX SA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The level of impurities in crude TPA makes 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

[0046] In one embodiment of the invention, as figure 1 As shown, a method for recovering metal catalysts from mother liquor 301 is provided. The method includes the following steps.

[0047] Step (a) comprises evaporating mother liquor 301 containing carboxylic acid, metal catalyst, impurities, water and solvent in first evaporation zone 321 to produce vapor stream 304 and concentrated mother liquor stream 305 .

[0048] Mother liquor 301 is discharged from the carboxylic acid oxidation synthesis process. Mother liquor 301 is used as a feed stream in the process of the present invention. The mother liquor contains carboxylic acid, water, solvent, metal catalyst and impurities. The impurities include organic bromides and corrosion metals. Organic bromides are used as co-catalysts for oxidation reactions. Examples of corrosive metals are iron and chromium compounds which inhibit, reduce or completely destroy the activity of metal catalysts.

[0049] Suitable carboxylic aci...

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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, a metal catalyst, impurities 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) mixing in a mixing zone a water-solvent solution and optionally an extraction solvent with the super concentrated motherliquor stream to form an aqueous mixture;(d) optionally separating organic impurities from the aqueous mixture in a solid-liquid separation zone to form a purified aqueous mixture; and (e) extractingthe aqueous mixture or purified aqueous mixture with an extraction solvent in an extraction zone to form an extract stream and the raffinate stream.

Description

technical field [0001] The present invention relates to a process for the recovery of metal catalysts from the mother liquors of 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 or the purified aqueous mixture to a single-stage extraction to remove organic impurities to obtain an extract stream containing Raffinate stream of 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 be further treated 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 applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/04B01J23/94B01J38/00B01J38/04B01J38/06C07B61/00C07C51/265C07C51/42C07C51/48C07C63/26
CPCC07C51/42C07C51/48Y02P20/52C07C63/26B01J38/04B01J38/06
Inventor 林鑫M·德弗里德
Owner GRUPO PETROTEMEX SA
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