Method for preparation of mixed benzol dimethanoic acid and benzene acetic acid

A technology for mixing xylene and phthalic acid, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylate, etc., can solve problems such as inability to separate ethylbenzene

Inactive Publication Date: 2008-12-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing technology cannot completely separate ethylbenzene from the other three components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Embodiment 1, the manufacture method of mixed phthalic acid and phenylacetic acid, the technical process is mainly divided into four parts, namely oxidation, phenylacetic acid separation and phenylacetic acid refining, mixed phthalic acid refining, and phthalic anhydride and dimixed phthalic acid separate. According to different product quality requirements and standards, the refining process can be abandoned or simplified.

[0071] (1), oxidation part

[0072] Using mixed xylene as the main raw material, oxygen in compressed air as the auxiliary raw material, acetic acid as the solvent, cobalt acetate and manganese acetate as the catalyst, and hydrobromic acid as the auxiliary catalyst, the oxidation reaction is carried out under relatively mild temperature conditions. Produces mixed phthalic acid (MA) and phenylacetic acid. The "relatively mild temperature conditions" are: a temperature of about 180°C, a pressure of 0.5-2.5Mpa, and a reaction time of 50-180min.

[...

Embodiment 2

[0092] Embodiment 2 is basically the same as Embodiment 1, but has the following changes:

[0093] The temperature of the oxidation part in step (1) is 100-160° C.;

[0094] In step (2) separation of phenylacetic acid and refining of phenylacetic acid, the method of vacuum distillation is used to separate phenylacetic acid and mixed phthalic acid, so as to reduce the operating temperature of the fluidized bed and avoid the sublimation of phthalic anhydride from entering the phenylacetic acid system;

[0095] In step (3) mixed phthalic acid refining part, hydrogenation reduction refining, mixed phthalic acid (MA) aqueous solution hydrogenation reaction, also can use amorphous nickel as catalyst, carry out in the magnetically stable bed catalytic system. The magnetically stabilized bed technology is used to maintain the suspension, dispersion and relative position stability of the catalyst. In order to increase the reaction residence time, the reaction medium can be designed to...

Embodiment 3

[0096] Embodiment 3 is basically the same as Embodiment 1, but has the following changes:

[0097] The temperature of the oxidation part in step (1) is 190-250° C.;

[0098] Omit the following two steps between the hydroreduction refining step (3)-b and the step (3)-d:

[0099] (3)-c, secondary oxidation refining

[0100] (3)-d, triple oxidation (hydrogen peroxide oxidation) refining.

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Abstract

The invention discloses a method for making mixed benzene dicarbonic acids and a phenyl acetic acid, comprising the following steps of: performing an oxidization reaction by using mixed xylenes as a raw material, oxygen or oxygen in compressed air as an auxiliary raw material, an acetic acid as a solvent, cobalt acetate and manganese acetate as catalysts, a hydrobromic acid as an auxiliary catalyst, at a temperature of between 100 and 250 DEG C and a pressure of between 0.5 and 2.5 MPa for 50 to 180 minutes to obtain a mixture of mixed benzene dicarbonic acids of p-phthalic acid, m-phthalic acid and o-phthalic acid and a phenyl acetic acid; separating the phenyl acetic acid and the mixed benzene dicarbonic acids. The novel method for producing the phenyl acetic acid of the invention is a technical innovation with high economic value. The oxidization of phenylethane and the separation and refining of an oxide of the phenylethane are applied throughout the technological process for making mixed benzene dicarbonic acids from four components of the mixed xylenes, which is a technical problem in the field. The method creatively solves the technical problem.

Description

technical field [0001] The invention relates to a manufacturing method of chemical products, in particular to a manufacturing method of mixing phthalic acid and phenylacetic acid. Among them, mixed phthalic acid (PMA) is a new product whose main components are isophthalic acid, terephthalic acid and phthalic acid (phthalic anhydride). Mixed phthalic acid (PMA) can be used as a raw material for a new type of polyester resin - polyethylene mixed phthalate, and can also be mixed with purified terephthalic acid (PTA) in various proportions to produce different performance and Polyester resin for use. [0002] Phenylacetic acid is a fine chemical raw material with a wide range of uses, and can be used in medicine, spices, dyes, pesticides and plant growth regulators. Background technique [0003] The current polyester industry chain product and technology route is: aromatics extraction → mixed xylene (MX) → p-xylene (PX) → purified terephthalic acid (PTA) → polyester (PET), exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/265C07C63/15C07C57/32B01J31/04
Inventor 周向进邢建良刘建新汪洋陈韶辉邢跃军
Owner CHINA PETROLEUM & CHEM CORP
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