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Method for removing impurities from oxidation products

A product and impurity technology, applied in the field of products obtained by oxidation of halogenated ortho-xylene, can solve problems such as cost increase, yield loss, color increase, etc.

Inactive Publication Date: 2008-06-04
SABIC INNOVATIVE PLASTICS IP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are deficient because of the loss of yield, increased color and increased costs associated with the energy required to perform the reaction

Method used

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  • Method for removing impurities from oxidation products
  • Method for removing impurities from oxidation products
  • Method for removing impurities from oxidation products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Synthesis of 4- and 7- Chlorinated 2-benzo[c]furanone (produced by reduction of 3-chlorophthalic anhydride) mixture A 35% by weight solution of crude chlorophthalic acid in water was prepared. The mixture was stirred at about 60°C for 2 hours. After stirring, all the chlorophthalic anhydride had been hydrolyzed to chlorophthalic acid, as shown by gas chromatographic analysis (GC), which showed There is no anhydride in the organic phase. preparing vials each containing 5 milliliters (ml) of an aqueous phase containing a concentration of crude chlorophthalic acid (5% to 35% by weight, based on the weight of the total aqueous phase), and Optional acetic acid (0% to 36% by weight, based on the weight of the entire aqueous phase). Each vial was then treated with 5 ml of toluene, o-dichlorobenzene (ODCB) or o-xylene. These vials were then shaken vigorously on a mechanical shaker at a specific temperature (22°C, 42°C or 60°C) for 50 minutes. The phases were allowed to sepa...

Embodiment 2

[0068] The procedure of Example 1 was repeated, but the extraction was carried out at 22° C. with an initial chlorophthalic acid concentration of 22% by weight in the presence of different contents of acetic acid. Data are presented in Table 2.

[0069] Table 2

[0070]

[0071] These data show that increasing the acetic acid addition decreases the K and β values ​​when using toluene or ODCB as the extractant under these conditions. Similar trends were observed when xylene was used as the extraction solvent at 30 °C and 60 °C.

Embodiment 3

[0073] The procedure of Example 1 was repeated, but the extraction was performed without acetic acid at different wt% initial chlorophthalic acid concentrations at 60°C.

[0074] table 3

[0075]

[0076] These data show that under these conditions, when using toluene or ODCB as the extractant, in the absence of acetic acid, the K value of the extraction increases with increasing temperature, while the selectivity increases or decreases depending on the extraction solvent. . When xylene or 4-chloro-o-xylene was used as the extraction solvent at 30°C, the K value and the selectivity value were similar and decreased with the increase of chlorophthalic acid content in the aqueous phase. Similar trends were observed when xylene was used as the extraction solvent at 60 °C, moreover, K values ​​and selectivity values ​​were lower than those obtained at 30 °C.

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Abstract

Disclosed is a method for removing impurities from products derived from oxidation of an ortho-dialkylaromatic compound which comprises at least one step selected from the group consisting of extraction of an aqueous solution comprising aromatic dicarboxylic acid product with an organic solvent and extraction of an organic solution comprising aromatic anhydride product with an aqueous bicarbonate solution for a time period insufficient to allow hydrolysis of anhydride to acid.

Description

technical field [0001] The present invention relates to a process for the removal of impurities from products obtained by oxidation of ortho-dialkylaromatic compounds. In one embodiment, the present invention relates to a method for removing impurities from a product obtained by oxidation of o-xylene. In another embodiment, the present invention relates to a process for the removal of impurities from products obtained from the oxidation of halogenated ortho-dialkylbenzenes, particularly products obtained from the oxidation of halogenated ortho-xylenes. technical background [0002] Aromatic ortho-dicarboxylic acids and their corresponding anhydrides are generally produced by oxidation of ortho-dialkylaromatic compounds. A specific example is the well known process for the production of phthalic acid and phthalic anhydride by oxidation of ortho-xylene in the presence of a catalyst and a source of oxygen. The production of halophthalic acid and halophthalic acid, such as chl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/48C07C51/265C07C63/16C07C63/22C07D307/89C07C51/573
CPCC07C51/48C07C51/573C07C63/16C07C63/72C07C63/68
Inventor R·E·科尔波恩F·F·库里
Owner SABIC INNOVATIVE PLASTICS IP BV
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