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Continuous production process of p-tert-butyl toluene

A technology for the production of p-tert-butyltoluene, which is applied to the production of bulk chemicals, molecular sieve catalysts, and condensation between hydrocarbons and non-hydrocarbons to produce hydrocarbons. It can solve problems such as non-recyclable use, catalyst corrosion, and separation difficulties, and achieve The effect of low labor intensity, high mechanical strength and simple process

Active Publication Date: 2013-09-04
FAREAST KINGSTAR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is how to overcome defects such as catalyst corrosion equipment, environmental pollution, separation difficulties and inability to recycle in the liquid acid catalyzed synthesis of p-tert-butyltoluene, and adopt a molecular sieve loaded with metal oxides as a catalyst, Provide a green, efficient and continuous synthesis process of p-tert-butyltoluene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the continuous production process of this p-tert-butyltoluene comprises the following steps,

[0020] 1) Preparation of supported metal oxide molecular sieve catalyst:

[0021] According to the ratio of adding 0.10g HZSM-5 molecular sieve to each mL ferric nitrate solution, mix the HZSM-5 molecular sieve with the ferric nitrate solution whose substance concentration is 1.0mol / L, and stir at 80°C for 24 hours to make it impregnation balance; then dry the obtained sample at 120°C for 4 hours; then calcinate at 550°C for 4 hours, and obtain the catalyst powder after cooling to room temperature; press the catalyst powder, pulverize and screen to obtain 20-40 mesh granular catalyst.

[0022] 2) Synthetic reaction of p-tert-butyltoluene:

[0023] Put the granular catalyst prepared in step 1) into a fixed-bed reactor, then mix tert-butanol and toluene with a molar ratio of 4:1, and pump it into the evaporator, and enter the reactor containing the catalyst after...

Embodiment 2

[0025] Embodiment 2: the continuous production process of this p-tert-butyltoluene comprises the following steps,

[0026] 1) Preparation of supported metal oxide molecular sieve catalyst:

[0027] According to the ratio of adding 0.10g USY molecular sieve to each mL of magnesium nitrate solution, mix the USY molecular sieve and the magnesium nitrate solution with a substance concentration of 1.0mol / L evenly, and stir at 80°C for 24 hours to make it impregnated and balanced; then The obtained sample was dried at 120°C for 4 hours; then calcined at 550°C for 4 hours, and the catalyst powder was obtained after cooling to room temperature; the catalyst powder was pressed into tablets, crushed and screened to obtain 20-40 mesh particles shape catalyst.

[0028] 2) Synthetic reaction of p-tert-butyltoluene:

[0029] Put the granular catalyst prepared in step 1) into a fixed-bed reactor, then mix tert-butanol and toluene with a molar ratio of 4:1, and pump it into the evaporator, ...

Embodiment 3

[0031] Embodiment 3: the continuous production process of this p-tert-butyltoluene comprises the following steps,

[0032] 1) Preparation of supported metal oxide molecular sieve catalyst:

[0033] According to the ratio of adding 0.10g HZSM-5 molecular sieve in every mL mixed nitrate solution, the ferric nitrate and zirconium nitrate mixed solution that the HZSM-5 molecular sieve and the substance concentration are respectively 1.0mol / L, 0.8mol / L are mixed evenly, and stirred at 80°C for 24 hours to allow impregnation to balance; then the obtained sample was dried at 120°C for 4 hours; then calcined at 550°C for 4 hours, and the catalyst powder was obtained after cooling to room temperature; The body is pressed into tablets, pulverized and screened to obtain a granular catalyst of 20-40 mesh.

[0034] 2) Synthetic reaction of p-tert-butyltoluene:

[0035] Put the granular catalyst prepared in step 1) into a fixed-bed reactor, then mix tert-butanol and toluene with a molar r...

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Abstract

The invention relates to a continuous production process of p-tert-butyl toluene, and in particular relates to a method for synthetizing the p-tert-butyl toluene through catalyzing toluene and tert butyl alcohol by using a metallic oxide-supported molecular sieve catalyst. The invention aims to overcome the shortcomings that catalysts corrode equipment, pollute the environment and are difficult to separate and incapable of being recycled and the like in traditional methods for synthetizing the p-tert-butyl toluene through liquid acid catalysis. The continuous production process of the p-tert-butyl toluene comprises the following steps of (1) preparation of the metallic oxide-supported molecular sieve catalyst and (2) synthetic reaction of the p-tert-butyl toluene. The process disclosed by the invention has the advantages of simpleness, environmental friendliness, low labour intensity and low production cost; by adopting the homemade metallic oxide-supported molecular sieve catalyst, the problems that the liquid acid catalysts corrode equipment and pollute the environment in the traditional production methods are solved; and in the meantime, the homemade catalyst is high in activity, good in heat stability, high in mechanical strength and capable of meeting the requirements of long-period operation in the continuous production process of fixed beds.

Description

technical field [0001] The invention relates to a continuous production process of p-tert-butyltoluene, in particular to a method for synthesizing p-tert-butyltoluene from toluene and tert-butanol catalyzed by a metal oxide molecular sieve, which belongs to the field of chemical industry. Background technique [0002] p-tert-butyltoluene (PTBT) is an important chemical raw material, an intermediate for the production of p-tert-butylbenzoic acid, p-tert-butylphenylacetaldehyde, and p-tert-butylanisole, and is also used in spices, plastics, and resins. An important intermediate in industry. According to different raw materials, the method for producing p-tert-butyltoluene can be divided into three routes: (1) reaction method of isobutene and toluene; (2) reaction method of tert-chlorobutane and toluene; (3) reaction method of tert-butanol and toluene Law. Industrially, the catalysts used in these several production processes for the synthesis of tert-butyltoluene are mostly ...

Claims

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Application Information

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IPC IPC(8): C07C15/02C07C2/86B01J29/46B01J29/14
CPCY02P20/52
Inventor 孙志强罗辉吴亚军
Owner FAREAST KINGSTAR CHEM
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