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Fluidization catalytic method for producing m-cresol and p-cresol through isomerization of o-cresol

A technology of fluidized catalysis and o-cresol, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of short active life of catalysts and difficulty in regeneration, and achieve the effect of short catalyst life

Inactive Publication Date: 2013-10-09
BEIJING RISUN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention mainly solves the problems of short catalyst activity life and difficult regeneration in the existing cresol isomerization process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0023] The isomerization reaction of o-cresol was carried out according to the steps and conditions described in the above process, wherein the catalysts used in Examples 1-3 were ZSM-5 (silicon-aluminum ratio 38), mordenite and Beta. The specific reaction evaluation results are shown in Table 1.

[0024] Table 1

[0025] Example

[0026] The data in Table 1 shows that using a fluidized bed to catalyze the isomerization of o-cresol can effectively solve the problem of short catalyst life in a stirred tank fixed bed. Moreover, the conversion rate of o-cresol remains at a high level. The selectivity of m-cresol is very high.

Embodiment 4～6

[0028] The isomerization reaction of o-cresol was carried out according to the steps and conditions described in Example 1, and the molar ratio of carrier gas nitrogen to o-cresol was changed. The specific reaction conditions and evaluation results are listed in Table 2.

[0029] Table 2

[0030] Example

[0031] The data in Table 2 shows that the phenolic nitrogen molar ratio has an optimal value. From small to optimal value, the selectivity of o-cresol isomerization to m-cresol is increasing, and when it exceeds the optimal value, the selectivity is decreasing. However, the conversion of o-cresol decreased with the increase of phenol nitrogen ratio.

Embodiment 7～10

[0033] Carry out o-cresol isomerization reaction according to the steps and conditions described in Example 1, change the reaction temperature, and the specific reaction conditions and evaluation results are listed in Table 3

[0034] table 3

[0035] Example

[0036] The data in Table 3 show that the reaction temperature of the isomerization reaction of o-cresol has a great influence on the isomerization result. The above experimental results show that the optimal reaction temperature for isomerization is about 290°C to about 430°C, and the best is about 390°C.

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PUM

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Abstract

The invention relates to a fluidization catalytic method for producing m-cresol and p-cresol through isomerization of o-cresol. According to the method, o-cresol and a carrier gas are gasified in a preheater, and m-cresol and p-cresol are produced through isomerization by adopting the fluidization catalytic method, so that problems of short service life of a catalyst and low conversion rate in the isomerization process of cresol at present are better solved. The fluidization catalytic method can be applied to industrial production for large-scale production of the m-cresol and the p-cresol.

Description

technical field [0001] The invention relates to a fluidized catalytic method for isomerizing o-cresol to produce m-cresol and p-cresol. Background technique [0002] Cresol includes three isomers, namely o-cresol, p-cresol and m-cresol, all of which are important fine chemical intermediates. In particular, the supply of p- and m-cresol is seriously in short supply in China, and a considerable amount needs to be imported every year to meet the domestic market demand. [0003] The current industrial routes for producing m-cresol or p-cresol include: toluene sulfonation alkali fusion method, toluene chlorination hydrolysis method, phenol alkylation method, cumene oxidation method. [0004] Toluene sulfonation alkali fusion method: This method has mature technology and simple process, but it uses a large amount of strong acid and strong alkali, causing serious equipment corrosion and environmental pollution. Toluene chlorination hydrolysis: This method has strict requirements ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/07C07C37/00
Inventor 张英伟薛全民印文雅张令霞孙长江
Owner BEIJING RISUN TECH CO LTD
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