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Catalyst for synthesizing 2,3,6-trimethylphenol and preparation method thereof

A technology of trimethylphenol and catalyst, which is applied in the preparation of organic compounds, chemical instruments and methods, catalysts for physical/chemical processes, etc., can solve the problems of high price, use of toxic metals, short service life of catalysts, etc., and achieve improved purity. , avoid waste and improve production efficiency

Inactive Publication Date: 2013-03-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem: the purpose of the present invention is to solve the problems of short service life, high price and use of toxic metals in the production of 2,3,6-trimethylphenol, and provide a cheap and environmentally friendly catalyst with high activity and The selectivity of 2,3,6-trimethylphenol is high, and the service life can reach more than 3000h

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Accurately weigh Fe(NO 3 ) 3 9H 2 O 20g, FeCl 3 10g, Al(NO 3 ) 3 9H 2 O 0.1g, AlCl 3 O 16g, Al(OAC) 3 0.22g and Na 2 SO 4 9H 2 O 0.06g, dissolve it in 350ml of deionized water, then slowly add ammonia solution with a concentration of 1:1 to pH=6 at room temperature and under stirring conditions, the time of adding drops is about 1h, and continue to stir for 2h at room temperature age it;

[0025] 2) Then the precipitate was suction filtered and washed three times, baked in an oven at 110°C for 24 hours to remove moisture, and finally calcined in a muffle furnace at 500°C for 5 hours to obtain a block solid;

[0026] 3) Grind the obtained massive solid to 10-80 mesh, and impregnate the ground particles in a solution containing 0.014gNa 2 CO 3 7mL of deionized aqueous solution, soaked for 24h, then dried the impregnated solid particles at 110°C, and calcined at 500°C for 3h. Catalyst Fe 2 o 3 -SiO 2 -Al 2 o 3 -K 2 O, wherein the ratio of the amount ...

Embodiment 2

[0028] 1) Accurately weigh Fe(NO 3 )2 20g, Fe(C 2 h 4 )15g, FeSO 4 10g, Al(NO 3 ) 3 9H 2 O 10g, AlCl 3 1.20g and Na 2 SO 4 9H 2 O 6.99g, it is dissolved in the deionized water of 350ml, then at room temperature, under stirring condition, slowly add dropwise molar ratio and be sodium hydroxide: ammoniacal liquor=1:1, the solution that mass total concentration is 30% is to pH=7 , continue to stir at room temperature for 2h to age it;

[0029] 2) Then the precipitate was suction filtered and washed three times, baked at 110°C for 24 hours, and calcined at 500°C for 5 hours to obtain a massive solid;

[0030] 3) Grind the obtained massive solid to 10-80 mesh, and impregnate the ground particles in a solution containing 1.10g Na 2 CO 3 , 0.41gKOH in 8mL of deionized aqueous solution, impregnated for 24h, then dried at 110°C, and calcined at 500°C for 3h to obtain the catalyst FeO-SiO 2 -Al 2 o 3 -K 2 O, wherein the ratio of iron oxide, silicon dioxide, aluminum oxid...

Embodiment 3

[0032] 1) Accurately weigh Fe(NO 3 ) 3 9H 2 O 15g, Fe 2 (SO 4 ) 3 10g, Fe(NO 3 ) 2 12g, FeSO 4 10gAl(NO 3 ) 3 9H 2 O 0.4g, AlCl 3 ·6H 2 O0.25g, Al(OH)C 4 h 6 o 4 0.26g and Na 2 SO 4 9H 2 O1.5g, silica gel 0.27g, it is dissolved in the water of 350ml, then under the condition of stirring, slowly add dropwise the molar ratio is NaOH:KOH=1:3, the total mass concentration is 30% solution to pH=5, room temperature Continue to stir for 2h;

[0033] 2) Then the precipitate was suction filtered and washed three times, baked at 110°C for 24 hours, and calcined at 500°C for 5 hours to obtain a massive solid;

[0034] 3) Grind the obtained blocky solid to 10-80 mesh, - impregnate the ground particles in a solution containing 0.012g Na 2 CO 3 , 0.05g K 2 CO 3 6.7mL of deionized aqueous solution, soaked for 24h, then dried at 110°C, and calcined at 500°C for 3h to obtain the catalyst Fe 2 o 3 -FeO-SiO 2 -Al 2 o 3 -K 2 O-Na 2 O, wherein the ratio of iron oxide...

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PUM

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Abstract

The invention discloses a method for preparing 2,3,6-trimethylphenol, and the 2,3,6-trimethylphenol is an important intermediate of vitamin E. The method comprises the following steps of: enabling a mixture of metacresol, methanol and water to pass a fixed bed reactor containing an o-position methylation catalyst in a liquid space velocity of 0.4-10 h<-1>, and preparing the 2,3,6-trimethylphenol by carrying out a gas solid phase catalytic reaction under a temperature of 280-450 DEG C and a pressure of 0-10 MPa, wherein the o-position methylation catalyst consists of iron oxide, silicon dioxide and alkali metal oxide, and in the oxides, the metal ion molar ratio of iron, silicon, aluminum and alkali metal is equal to 100:(0.1-10):(0.2-5):(0-1). According to a catalyst for synthesizing the 2,3,6-trimethylphenol and a preparation method thereof, the conversion rate of the metacresol for compounding the 2,3,6-trimethylphenol is 100%, the yield of the 2,3,6-trimethylphenol is above 99.9%, and the service life of the catalyst is longer than 3000 hours.

Description

technical field [0001] The invention belongs to the technical field of solid catalysts, and relates to a catalyst for 2,3,6-trimethylphenol, an important intermediate of vitamin E, and a preparation method of the catalyst. Background technique [0002] 2,3,6-Trimethylphenol, also known as trimethylphenol, 1-hydroxy-2,3,6-trimethylphenol, 3-hydroxypseudocumene, white or light yellow crystal, has a strong phenolic smell , Insoluble in water, has good solubility in alcohol. The basic organic chemical raw material 2,3,6-trimethylphenol has a wide range of applications. In addition to being used in the synthesis of the main ring of vitamin E, it is also used as a monomer for the production of heat-resistant polyphenylene ether engineering plastics and a raw material for plastic alloys. At the same time, this substance has a good antioxidant function and is widely used in food additives, feed additives and cosmetics. In addition, it is also an indispensable intermediate and mediu...

Claims

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Application Information

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IPC IPC(8): B01J23/78C07C39/07C07C37/16
Inventor 肖国民李遵陕姜枫牛磊熊振
Owner SOUTHEAST UNIV
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