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Method for producing anisole from phenol and methanol

A technology of anisole and phenol, which is applied in the field of preparation of anisole, can solve the problems of high phenol conversion rate, low catalyst service life, harsh conditions, etc., and achieve the effect of simple preparation process, long service life and high conversion rate

Active Publication Date: 2019-06-14
BAOJI UNIV OF ARTS & SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although some breakthroughs have been made in the above research, the catalysts all show high initial activity, but as the reaction progresses, the catalyst activity gradually decays, and the service life of the catalyst is low, and some catalysts exist only under the condition of high alcohol-phenol ratio. In order to obtain better anisole selectivity and higher phenol conversion rate, etc., it will inevitably lead to a sharp increase in energy consumption, an increase in production cost, and it is difficult to have market competitiveness; at the same time, the preparation process of some catalysts is complicated and the conditions are harsh, resulting in The high cost of the catalyst also limits its industrial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Add 100g of β-type molecular sieve with a silicon-aluminum ratio of 23:1 into 200g of deionized water, add 1g of sodium nitrate, stir for 3 hours, filter, wash, dry at 100°C, put it in a muffle furnace and roast at 400°C After 3 hours, a catalyst carrier was obtained.

[0020] 2. Using the equal-volume impregnation method, add 100g of the catalyst carrier into deionized water, and add 0.1g of silver nitrate, impregnate at room temperature for 4h, dry at 80°C, put it into a muffle furnace and roast at 500°C for 3h, cool to obtain the catalyst .

[0021] 3. The catalyst obtained in step 2 is granulated and formed into cylindrical particles with a diameter of 4mm and a height of 4mm, and packed into a fixed bed reactor. The catalyst loading is 30mL, the inner diameter of the reaction tube is 28mm, and the material is 316L stainless steel; the phenol After preheating with methanol, the molar ratio is 1:3 and it passes through the fixed-bed reactor continuously. Under th...

Embodiment 2

[0023] 1. Add 100g of β-type molecular sieve with a silicon-aluminum ratio of 52:1 into 300g of deionized water, and add 2g of potassium nitrate, stir for 5h, filter, wash, dry at 90°C, put in a muffle furnace and bake at 450°C for 4 hours, A catalyst carrier is obtained.

[0024] 2. Using the equal-volume impregnation method, add 100g of the catalyst carrier into deionized water and 0.2g of silver nitrate, impregnate at room temperature for 4 hours, dry at 90°C, put it into a muffle furnace and roast at 550°C for 5h to obtain the catalyst.

[0025] 3. According to the method in step 3 of Example 1, the gas phase reaction was carried out to generate anisole. After 200 hours of reaction, the conversion rate of phenol was 89.8%, and the selectivity of anisole was 97.4%.

Embodiment 3

[0027] 1. Add 100g of β-type molecular sieve with a silicon-aluminum ratio of 76:1 into 500g of deionized water, add 5g of potassium nitrate and 1g of cesium nitrate, stir for 5h, filter, wash, dry at 90°C, and put in a muffle furnace at 450°C Calcined for 5 hours to obtain a catalyst carrier.

[0028] 2. Using the equal-volume impregnation method, add 100g of the catalyst carrier into deionized water, add 0.3g of palladium chloride, impregnate at room temperature for 5 hours, dry at 90°C, put it into a muffle furnace and roast at 550°C for 5 hours to obtain the catalyst.

[0029] 3. According to the method in step 3 of Example 1, the gas phase reaction was carried out to generate anisole. After 200 hours of reaction, the conversion rate of phenol was 91.6%, and the selectivity of anisole was 98.9%.

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Abstract

The invention discloses a method for producing anisole from phenol and methanol. According to the method, a fixed bed reactor is adopted, a molecular sieve modified by sodium nitrate, potassium nitrate, cesium nitrate or magnesium nitrate is loaded with silver nitrate, palladium chloride, lanthanum nitrate, cerium nitrate and and other active components to serve as a catalyst, the efficient synthesis of the anisole is realized, the phenol conversion rate is high, and the selectivity of the anisole is high, the preparation process of the catalyst is simple, the cost is low, the stability is high, the service life is long, and the application requirements of the industrial catalyst are met.

Description

technical field [0001] The invention belongs to the technical field of preparation of anisole, in particular to a method for producing anisole by using phenol and methanol. Background technique [0002] Anisole, also known as anisole, anisole, and methoxybenzene, is an important chemical raw material. Because of its special fragrance, it can be used as an additive to soaps and detergents; Used as an intermediate in insecticides; due to its large dielectric constant and high boiling point, it can be used as an excellent general reagent, initiator, solvent, thermostat filler, etc., and it can also be used as a substitute for gasoline additives because it can increase the octane number of gasoline MTBE can also be used as solvent, synthetic resin and fuel additive in printing industry and paint industry. In recent years, the market demand for anisole has increased dramatically. [0003] The synthetic method of anisole mainly contains dimethyl sulfate method, dimethyl carbonat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/205C07C41/09B01J29/74B01J29/12B01J29/035
Inventor 王伟范丽娟蔺彩虹冯国栋
Owner BAOJI UNIV OF ARTS & SCI
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