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Method for preparing 1,4-benzenedimethanol by performing atmospheric oxidation on p-xylene

A technology for terephthalic alcohol and paraxylene, which is applied in the field of preparing terephthalic alcohol and can solve the problems of long reaction route, pollution and the like

Active Publication Date: 2014-06-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is the problem of long reaction route and serious pollution existing in the prior art, and a kind of preparation method of terephthalamide is provided, and the method has the advantages of short reaction route, less pollution and high yield high feature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] co 3 O 4 -Al 2 O 3 Preparation of composite oxide support: Take 10ml1mol / L Co(NO 3 ) 2 and 1500ml1mol / L Al(NO 3 ) 3 Put it into a three-necked flask, raise the temperature to 60°C and keep stirring, add the precipitating agent NH 4 HCO 3 Until the precipitation is complete, age at this temperature for 4 hours, then filter, wash, dry at 110°C for 12 hours, and finally roast at 500°C for 4 hours, cool to room temperature, and crush the resulting solid to 20-40 meshes for use.

[0010] Catalyst preparation: According to the Au content in the catalyst of 0.1wt%, the Pt content of 0.05wt%, weigh the corresponding mass of NaAuCl 4 and Na 2 PtCl 6 Dissolved in water to form an impregnation solution, the above obtained Co 3 o 4 -Al 2 o 3 The composite oxide carrier was impregnated, and 1mol / L NaOH solution was added to adjust the pH value to 7-8, impregnated for 12h, then filtered, washed with deionized water, until AgNO 3 Solution detection The ...

Embodiment 2-4

[0015] Change the molar ratio of Co and Al, and all the other operations are the same as in Example 1. For ease of comparison, the catalyst composition and catalyst evaluation results are listed in Table 1, and the evaluation conditions of the catalyst are listed in Table 2.

[0016]

Embodiment 5-12

[0018] Change the Au, Pt content and the molar ratio of Cu and Au in the catalyst, and other operations are the same as in Example 1. For the convenience of comparison, the catalyst composition and catalyst evaluation results are listed in Table 1, and the evaluation conditions of the catalyst are listed in Table 2.

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PUM

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Abstract

The invention relates to a method for preparing 1,4-benzenedimethanol by performing atmospheric oxidation on p-xylene, and mainly solves the problems that a reaction route is long and pollution is server in the prior art. The method comprises: employing p-xylene as a raw material, at the reaction temperature of 70-110 DEG C, under the reaction pressure of 0.5-3 MPa, with the volume space velocity of 0.5-3 h<-1>, and under the condition of the air-to-paraxylene molar ratio of 10-30, contacting the raw material with a catalyst for reacting and generating 1,4-benzenedimethanol, wherein the catalyst employs a Co3O4-Al2O3 composite oxide as a carrier, the molar ratio of Co to Al is 1:100-250, Au, Pt and Cu are active components, the content of Au is 0.1-1 wt%, the content of Pt is 0.05-1 wt%, and the molar ratio of Cu to Au is 4-8. The technical scheme relatively well solves the problems and is applicable to industrial production of 1,4-benzenedimethanol.

Description

technical field [0001] The invention relates to a method for preparing p-xylylenedimethanol by air oxidation of p-xylene. Background technique [0002] Terephthalic alcohol is an important organic polymer intermediate. Because it has two active hydroxyl groups in its structure, it can react with compounds with α-active hydrogen such as hydroxyl, aldehyde, and carboxyl to form a variety of polymers. They are the main raw materials for the production of products such as plasticizers, synthetic fibers, synthetic resins and adhesives. At present, the production of p-xylene is mainly based on p-xylene, which is hydrolyzed after chlorination. There are mainly US patents US3546301 (titled: Process for the preparation of aromatic glycols) and US3993699 (titled: Process for producing xylylene glycols). The disadvantages of these methods are that the reaction route is long, and the chlorination reaction causes corrosion and pollution to the equipment. In addition, the Chinese paten...

Claims

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Application Information

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IPC IPC(8): C07C33/26C07C29/50B01J23/89
CPCB01J23/8926C07C29/50C07C33/26
Inventor 朱庆才畅延青陈大伟
Owner CHINA PETROLEUM & CHEM CORP
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