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Solid acid catalyst and method for producing m-cresol

A solid acid catalyst, solid acid technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex operation process, cumbersome steps, unclear specific structure of molecular sieve catalyst and its separation effect, etc. , to achieve the effects of high reaction efficiency, low cresol loss rate and significant economic benefits

Pending Publication Date: 2021-12-03
ZHEJIANG HUANHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN104815612A discloses a molecular sieve adsorbent for the adsorption and separation of m-cresol and p-cresol and its preparation method, but the patent does not clarify the specific structure of the molecular sieve catalyst and its separation effect
It can be seen that the m-cresol production process provided in the above-mentioned patent has a certain promotion effect on the production of m-cresol. However, the above-mentioned method steps are loaded down with trivial details, and the operation process is complicated, and a more economical process is badly needed

Method used

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  • Solid acid catalyst and method for producing m-cresol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The o-cresol is sent as the reaction raw material into the preheater through the mass metering pump. The temperature of the preheater is set at 250°C. After sufficient preheating, it is fully mixed with the hydrogen medium. The molar ratio of hydrogen to phenol is 3:1, into the hydroisomerization reaction unit. The reaction conditions in the isomerization reaction system are reaction pressure 1.5 MPa, reaction temperature 380° C., and weight space velocity WHSV of raw material feeding 1.0 h-1. The isomerization reaction unit is pre-filled with a hydrogen-form lamellar MOR molecular sieve, and 2.7wt% of Re is added as a hydrogen active metal during the modification process of the molecular sieve. After the isomerization reaction, the reaction product is separated by gas-liquid and condensed, and the reaction product is separated through multiple rectification towers, and the unreacted converted ortho (p) cresol is recycled into the hydroisomerization process. In the rea...

Embodiment 2

[0034]After fully mixing o-cresol and p-cresol with a molar ratio of 2:1 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. After sufficient preheating , fully mixed with the hydrogen medium, the molar ratio of hydrogen to cresol is 3:1, and enter the hydroisomerization reaction unit. The reaction conditions in the isomerization reaction system are reaction pressure 1.5MPa, reaction temperature 360°C, and weight space velocity WHSV of raw material feed 1.5h-1. The hydrogen-type flake HMCM-36 molecular sieve was pre-filled in the isomerization reaction unit, and 2.3wt% Re and 0.16% Pd were added as hydrogen active metals during the modification process. After the isomerization reaction, the reaction product is separated by gas-liquid and condensed, and the reaction product is separated by multiple rectification towers, and the o-cresol and a small amount of dimethylphenol generated are ...

Embodiment 3

[0036] The o-cresol is sent as the reaction raw material into the preheater through the mass metering pump. The temperature of the preheater is set at 250°C. After sufficient preheating, it is fully mixed with the hydrogen medium. The molar ratio of hydrogen to cresol It is 3:1 and enters the hydroisomerization reaction unit. The reaction conditions in the isomerization reaction system are reaction pressure 1.5 MPa, reaction temperature 380°C, and weight space velocity WHSV of raw material feed 1.5h -1 . The hydrogen-type flake HUZM-8 molecular sieve was pre-filled in the isomerization reaction unit, and 1.9 wt% Co and 0.62% Ag were added as hydrogen active metals during the modification process. After the isomerization 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 and a small amount of dimethylphenol produced are recycled into the h...

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Abstract

The invention particularly relates to a solid acid catalyst and a method for producing m-cresol. The invention relates to a method for producing m-cresol, the method comprises the following steps: 1, heating a mixture raw material containing p-cresol and o-cresol by a preheater, and introducing the mixture raw material into a fixed bed reactor or a simulated moving bed reactor for reaction; 2, under the reaction conditions that the reaction pressure ranges from 0.1 MPa to 12.0 MPa, the temperature ranges from 180 DEG C to 450 DEG C, and the weight space velocity WHSV ranges from 1.0 h <-1 > to 12.0 h <-1 >, generating a reaction product containing o-cresol, m-cresol and p-cresol through the reaction under the action of the solid acid catalysts according to the claim 1 and the claim 6; and 3, separating the reaction product through a rectifying tower to obtain o-cresol and m-cresol and p-cresol mixture, and circulating the o-cresol which is not reacted and converted to serve as a reaction raw material to enter the reactor. The method has the advantages of high reaction efficiency, few dehydroxylation / methyl side reactions, low loss rate of cresol, low surface coking and inactivation of the catalyst, higher content of m-cresol and remarkable economic benefits.

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 m-cresol. Background technique [0002] Ortho, m, and p-cresol are three isomers of cresol. They are fine chemical raw materials with important uses, involving various fields of the national economy, and can be used to produce antioxidants, pesticides, resins, dyes, and pharmaceuticals. , spices and other products. Cresol production has good development prospects and broad market prospects. The traditional production of cresol is mainly obtained from coal liquefied oil through rectification and separation. However, due to limited cresol resources and complex separation processes, the chemical synthesis route of cresol has been paid more and more attention. The industrial production routes of cresol that have been developed include the toluene sulfonation alkali fusion method, isopropyl toluene method, Toluene chlorin...

Claims

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Application Information

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IPC IPC(8): B01J29/26B01J29/78B01J29/76B01J23/652B01J31/10B01J23/36B01J29/80C07C37/00C07C37/74C07C39/07
CPCB01J29/26B01J29/78B01J29/76B01J23/6527B01J31/10B01J23/36B01J29/80C07C37/00C07C37/74B01J29/40B01J29/70B01J2229/186B01J2231/52C07C39/07
Inventor 朱志荣关业军赵国庆贾文志
Owner ZHEJIANG HUANHUA TECH CO LTD
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