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Solid acid catalyst and method for producing cresol by using same

A solid acid catalyst and solid acid technology, applied in molecular sieve catalysts, bulk chemical production, chemical instruments and methods, etc., can solve the problems of single, low phenol conversion rate, etc., achieve low energy and material consumption, high production efficiency, and raw materials The effect of high conversion rate of phenol

Active Publication Date: 2021-09-07
ANHUI HAIHUA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production method of cresol products provided in the above-mentioned patent has a certain promotion effect on the production of cresol, however, in the above-mentioned method, the conversion rate of phenol is low, and the product is mainly p-cresol or o-cresol one, relatively simple

Method used

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  • Solid acid catalyst and method for producing cresol by using same
  • Solid acid catalyst and method for producing cresol by using same

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: a kind of method of producing cresol, the method comprises:

[0022] Step 1: After heating and vaporizing phenol, methanol and / or dimethyl ether in a preheater, they are mixed with hydrogen in a certain proportion.

[0023] Step 2, when the hydrogen:phenol molar ratio is 1:1-10:1, the phenol:methanol molar ratio is 5:1-15:1, the pressure is 0.1-10.0MPa (gauge pressure), the temperature is 180-450°C, the weight Airspeed WHSV is 0.3-8.0h -1 Under certain reaction conditions, the hydroalkylation reaction is carried out under the action of a solid acid catalyst to generate a reaction product containing mixed cresols of ortho, meta and p.

[0024] Wherein, the phenol in step 1 includes the phenol and dimethylphenol that are recycled and returned from the rectification and separation of the reaction product.

[0025] The reaction product obtained in step 2 is separated by one or more rectification towers to obtain ortho, m and p mixed cresols, and the unreacte...

Embodiment 2-9

[0040] The production technology of cresol is specifically expanded in following embodiment 2-9:

Embodiment 2

[0042] After fully mixing phenol and methanol with a molar ratio of 3:1 as the reaction raw materials, they are sent into the preheater through a mass metering pump. The temperature of the preheater is set at 250°C. Fully mixed, the molar ratio of hydrogen and phenol is 3:1, enter the hydroalkylation reaction unit. The reaction conditions in the alkylation reaction system are that the reaction pressure is 1.5MPa, the reaction temperature is 410°C, and the weight space velocity WHSV of the raw material feed is 1.0h -1 . The alkylation reaction unit is pre-filled with hydrogen needle crystal MOR molecular sieves. During the modification process, 2.6wt% Mo is added as the hydrogen active metal, and basic metal elements are added, respectively 2.3 wt% Ce and 0.2 wt% Cu. After the alkylation reaction, the reaction product is separated from gas and liquid and condensed, and the reaction product is separated through multiple rectification towers, and the unreacted converted phenol ...

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Abstract

The invention relates to a solid acid catalyst and a method for producing cresol by using the same, wherein the method comprises the steps: taking phenol as a raw material, carrying out hydroalkylation reaction on the phenol and methanol and / or dimethyl ether, and generating a product containing o-cresol, m-cresol and p-cresol mixture in a fixed bed reactor or a fluidized bed reactor, wherein porous solid acid which is modified by metal and has medium acidity is used as a hydroalkylation reaction catalyst. Compared with an alkylation reaction process of phenol and methanol used in current industrial production, the cresol production process provided by the invention has the characteristics of high reaction conversion rate, high selectivity of m-cresol and p-cresol with high added value, low energy and material consumption, good operation stability and environmental friendliness.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a solid acid catalyst and a method for producing cresol. Background technique [0002] Ortho, m, and p-cresol are three isomers of cresol, which are very important fine chemical raw materials. Various products such as antioxidants, pesticides, resins, dyes, medicines, and spices can be derived from cresol as a raw material, and their applications involve various fields of the national economy. O-cresol, m-cresol and p-cresol all have numerous downstream products and have good development prospects and broad market prospects. The traditional preparation method of cresol is natural separation, that is, rectification and separation from kerosene coke. However, limited by limited resources and complex processes, the chemical synthesis process of cresol has been gradually developed. At present, the main industrial production routes of cresol include, toluene sulfonation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/18B01J27/182B01J27/185B01J27/188B01J29/78B01J29/80B01J29/85B01J35/10C07C37/16C07C39/07
CPCB01J27/182B01J27/1856B01J29/78B01J29/85B01J27/188B01J29/80C07C37/16B01J2229/18B01J29/76B01J35/615C07C39/07Y02P20/52
Inventor 朱志荣赵国庆贾文志洪哲
Owner ANHUI HAIHUA CHEM
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