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Method for producing p-tert-butyltoluene

A technology of p-tert-butyltoluene and its production method, which is applied in the production of bulk chemicals, chemical instruments and methods, molecular sieve catalysts, etc., can solve the problems of poor selectivity of target products, inability to recycle, catalyst corrosion, etc., and achieve low production costs , easy to regenerate, produce safe effects

Inactive Publication Date: 2013-05-08
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a production method of p-tert-butyltoluene in order to overcome the shortcomings of catalyst corrosion equipment, non-recyclable use, environmental pollution, and poor selectivity of target products in the traditional method for synthesizing p-tert-butyltoluene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Prepare cetyltrimethylammonium bromide, NaOH and water into a certain solution, and add a certain amount of SiO under stirring 2 , forming 1SiO 2 :0.27NaOH:0.12Cetyltrimethylammonium bromide:30.30H 2 For the sol of O, under stirring conditions, add Naβ molecular sieve according to the mass ratio of the sol at 5%, continue to stir for 40 minutes, crystallize at 90°C for 24h, quench, adjust the pH to 12, continue to crystallize at 100°C for 48h, wash with water, and dry , Mesoporous composite catalyst was obtained after calcination. via NH 4 + H-type composite molecular sieves were prepared by ion exchange. 0.46g catalyst, 4.60g toluene and 7.40g tert-butanol (toluene and tert-butanol molar ratio=1: 2) are packed into reaction kettle, with N 2 The reactor was purged several times, pressurized to 0.6MPa, and reacted at 180°C for 4 hours under magnetic stirring, cooled to room temperature, and analyzed by gas chromatography, the conversion rate of toluene was 64.3%, an...

Embodiment 2

[0019] Prepare cetyltrimethylammonium bromide, NaOH and water into a certain solution, and add a certain amount of methyl silicate under stirring to form 1SiO 2 :0.50NaOH:0.46Cetyltrimethylammonium bromide:66.7H 2 O sol, under stirring conditions, add Naβ molecular sieve according to the mass ratio of the sol at 10%, continue to stir for 30min, crystallize at 110°C for 24h, quench, adjust the pH to 12, continue to crystallize at 110°C for 24h, wash with water, and dry , Mesoporous composite catalyst was obtained after calcination. via NH 4 + H-type composite molecular sieves were prepared by ion exchange. 0.69g catalyst, 4.6g toluene and 11.1g tert-butanol (toluene and tert-butanol molar ratio=1: 3) are packed into reaction kettle, use N 2 The reactor was purged several times, pressurized to 0.6MPa, and reacted at 200°C for 3 hours under magnetic stirring, cooled to room temperature, and analyzed by gas chromatography, the conversion rate of toluene was 69.6%, and the sele...

Embodiment 3

[0021] Prepare cetyltrimethylammonium chloride, NaOH and water into a certain solution, and add a certain amount of ethyl silicate under stirring to form 1SiO 2 :0.27NaOH:0.32Cetyltrimethylammonium chloride:67.4H 2 For the sol of O, under stirring conditions, add Naβ molecular sieve according to the mass ratio of the sol at 10%, continue to stir for 60 minutes, crystallize at 100°C for 24 hours, quench, adjust the pH to 14, continue to crystallize at 110°C for 24 hours, wash with water, and dry. After calcining, the mesoporous composite catalyst is prepared. via NH 4 + H-type composite molecular sieves were prepared by ion exchange. 0.69g catalyst, 4.6g toluene and 11.1g tert-butanol (toluene and tert-butanol molar ratio=1: 4) are packed into reaction vessel, use N 2 The reactor was purged several times, pressurized to 0.8MPa, and reacted at 200°C for 5 hours under magnetic stirring, cooled to room temperature, and analyzed by gas chromatography, the conversion rate of tol...

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Abstract

The invention discloses a method for producing p-tert-butyltoluene, which comprises the following steps of: putting toluene and tert-butyl alcohol in a molar ratio of 1:(2-6) and a catalyst in an amount which is 5 to 30 percent based on the total weight of the toluene serving as a reactant into a reaction kettle under the action of the mesoporous / microporous composite molecular sieve catalyst consisting of a beta zeolite (Hbeta) microporous molecular sieve and an MCM-41 mesoporous molecular sieve, and reacting at the temperature of between 160 and 240 DEG C for 2 to 8 hours to obtain the p-tert-butyltoluene. The preparation process is simple, the catalyst is easy to separate and is reusable, production cost is low, the method is environment-friendly, and safe production is realized.

Description

field of invention [0001] The invention relates to a production method of p-tert-butyltoluene, in particular to a production method for type-selective preparation of p-tert-butyltoluene by alkylation of toluene and tert-butanol, belonging to the technical field of chemical industry. Background technique [0002] p-tert-butyltoluene is an important chemical raw material and organic intermediate, its derivatives p-tert-butylbenzaldehyde, p-tert-butylbenzoic acid, p-tert-butylbenzoic acid methyl ester, p-tert-butylbenzyl Chlorine has a wide range of uses, and can be used in polypropylene nucleating agents, polyvinyl chloride heat stabilizers, additives for metal processing cutting and lubricating oils, antioxidants, alkyd resin modifiers, fluxes and fuels, and insecticides And flavors and fragrances and daily chemical industry. According to different raw materials, the synthesis of p-tert-butyltoluene can be divided into the following three routes: ① Alkylation of toluene and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/02C07C2/88B01J29/00
CPCY02P20/52
Inventor 周志伟武文良秦娟徐卫敏
Owner NANJING TECH UNIV
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