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Catalyst for synthesizing anisole from phenol-methanol and preparation method thereof

A methanol synthesis and catalyst technology, which is applied in ether preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of high reaction energy consumption, low product selectivity, and poor selectivity, and achieve good catalytic stability and simple preparation methods , highly selective effect

Pending Publication Date: 2021-08-06
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The high-temperature gas-solid heterogeneous reaction system is prone to process problems such as poor selectivity, high reaction energy consumption and carbon deposition. How to improve the reaction activity of methanol and the selectivity of products is the key problem to be solved in this reaction system
[0005] Aiming at the problems in the above-mentioned phenol-methanol reaction system, such as low methanol activity, easy carbon deposition and deactivation of the catalyst, and low product selectivity, the present invention provides a method for synthesizing benzene with high-efficiency methylation of phenol-methanol under mild liquid phase conditions. Molecular sieve catalyst of methyl ether and preparation method thereof

Method used

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  • Catalyst for synthesizing anisole from phenol-methanol and preparation method thereof

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Embodiment 1

[0019] A catalyst for synthesizing anisole from phenol-methanol, the catalyst is composed of Beta molecular sieve and modified metal Co, and the weight percentage of Co is 2.0% based on the weight of the molecular sieve carrier as 100%. The preparation process is as follows: stirring and dispersing a certain amount of Beta molecular sieve in 3 mol / L nitric acid solution, stirring and evaporating at 60°C, and drying at 90°C. Then, cobalt nitrate solution was added, evaporated with stirring at 80°C, dried at 120°C, and calcined at 400°C for 5 h in an air atmosphere to form a catalyst.

Embodiment 2

[0021] A catalyst for synthesizing anisole from phenol-methanol, the catalyst is composed of MCM-41 molecular sieve and modified metal Ce, and the weight percentage of Ce is 0.5% based on the weight of the molecular sieve carrier as 100%. The preparation process is as follows: Stir and disperse a certain amount of MCM-41 molecular sieve in 2 mol / L nitric acid solution, stir and evaporate at 90°C, and dry at 110°C. Then, cerium nitrate solution was added, stirred and evaporated at 90°C, dried at 100°C, and calcined at 500°C for 4 h in an air atmosphere to form a catalyst.

Embodiment 3

[0023] A catalyst for synthesizing anisole from phenol-methanol, the catalyst is composed of Y-type molecular sieve and modified metal Cr, and the weight percent content of Cr is 3.0% based on the weight of the molecular sieve carrier as 100%. The preparation process is as follows: stirring and dispersing a certain amount of Y-type molecular sieve in 3 mol / L nitric acid solution, stirring and evaporating at 80°C, and drying at 100°C. Then, a chromium hydrochloride solution was added, evaporated with stirring at 90°C, dried at 120°C, and calcined at 550°C for 5 h in a nitrogen atmosphere to form a catalyst.

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Abstract

The invention discloses a catalyst for synthesizing anisole from phenol-methanol and a preparation method thereof. The catalyst is composed of a molecular sieve carrier and a supported metal modification component, wherein the metal modification component is at least one of tin, chromium, zirconium, cobalt, magnesium and cerium. The preparation method of the catalyst comprises the following steps: (1) heating, stirring and dispersing a molecular sieve in a nitric acid solution with a certain concentration, and drying; and (2) dispersing and loading a metal active component onto the molecular sieve carrier obtained in the step (1), and roasting in a specific atmosphere to obtain the metal-molecular sieve catalyst. The catalyst provided by the invention has the advantages of high yield and high selectivity of anisole under mild phenol-methanol liquid phase reaction conditions.

Description

technical field [0001] The invention relates to the technical field of preparing anisole by phenol-methanol alkylation, in particular to a molecular sieve catalyst used for phenol-methanol methylation to synthesize anisole and a preparation method thereof. Background technique [0002] Methanol is an important basic chemical raw material with low toxicity and low price. Its high value-added application and research have always been one of the research hotspots of C1 chemical industry. Since the gas-phase alkylation of phenol was first reported in the 1940s, methanol has been gradually used as a methylating agent in the catalytic reaction system of phenol alkylation, and reacted with phenol to synthesize C-alkylated products (mainly ortho-, meta- , p-cresol) and O-alkylated products (mainly anisole), which have the advantages of low raw material cost and simple post-treatment. [0003] As a product of O-alkylation, anisole is widely used in organic synthesis. The synthesis ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J29/03B01J29/04B01J29/16B01J29/40B01J29/70B01J29/78C07C41/09C07C43/205
CPCB01J29/7615B01J29/0308B01J29/041B01J29/166B01J29/405B01J29/7057B01J29/7815C07C41/09B01J2229/186C07C43/205
Inventor 芮泽宝张昊丽
Owner SUN YAT SEN UNIV