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Method for synthesizing BTX aromatic methyl into unsym-trimethyl benzene

A technology for BTX aromatics and trimethylene, which is applied in the fields of condensation between hydrocarbons and non-hydrocarbons to produce hydrocarbons, organic chemistry, and isomerization to hydrocarbons, etc. It can solve the problems of no industrial application prospect and low yield of trimethylene. , to achieve good industrial application prospects, low cost of raw materials, and high selectivity.

Active Publication Date: 2010-02-24
SHANGHAI NOVEL CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this route, the yield of p-methylbenzene is on the low side, especially the price of p-xylene on the market is far higher than the price of p-xylene, so it is not possible to synthesize p-xylene as reaction raw material by alkylation reaction. Has industrial application prospects

Method used

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  • Method for synthesizing BTX aromatic methyl into unsym-trimethyl benzene
  • Method for synthesizing BTX aromatic methyl into unsym-trimethyl benzene
  • Method for synthesizing BTX aromatic methyl into unsym-trimethyl benzene

Examples

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Effect test

Embodiment 1

[0024] Preparation of molecular sieve catalyst:

[0025]Separate preparation of SiO by hydrothermal synthesis 2 / Al 2 o 3 =55 NaZSM-5, SiO 2 / Al 2 o 3 =30 NaZSM-22, SiO 2 / Al 2 o 3 =50 NaMCM-22, SiO 2 / Al 2 o 3 =25 NaMCM-49, SiO 2 / Al 2 o 3 =25 NaMCM-56 molecular sieve and SiO 2 / Al 2 o 3 =30 Naβ molecular sieve, the resulting molecular sieve is exchanged with ammonium chloride, washed and roasted, then pressed into tablets and sieved to get a certain number of particles to obtain hydrogen molecular sieve catalysts HZSM-5, HZSM-22, HMCM-22, HMCM -49, HMCM-49, HMCM-56 and Hβ are used as catalysts for the synthesis of trimethylene by alkylation.

Embodiment 2～7

[0027] The catalyst prepared in Example 1 was applied to the alkylation reaction of toluene and methanol to synthesize trimitylene, and the fixed-bed continuous reaction was adopted. The reaction conditions are: temperature 350°C, liquid mass space velocity 1h -1 , Benzene: Methanol (molar ratio) 1:2, the reaction time is 1 hour, normal pressure. The reaction results are shown in Table 2.

[0028] Table 2 Reaction performance of toluene and methanol alkylation to synthesize mesitylene on different catalysts

[0029]

Embodiment 8～10

[0031] Toluene is alkylated with methanol, dimethyl ether or methylene chloride to synthesize trimitylene, and the fixed-bed continuous reaction is adopted.

[0032] Reaction conditions: temperature 400°C, liquid mass space velocity 1h -1 , toluene: methanol or methyl chloride (molar ratio) 1:2, toluene: dimethyl ether (molar ratio) 1:1, the reaction time is 1 hour, normal pressure. The catalyst is SiO 2 / Al 2 o 3 =50 HMCM-22 molecular sieve. The reaction results are shown in Table 3.

[0033] Table 3 Reaction performance of toluene alkylation to synthesize mesitylene on HMCM-22 catalyst

[0034]

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Abstract

The invention relates to a method for synthesizing BTX aromatic methyl into unsym-trimethyl benzene. The method takes BTX aromatic hydrocarbon (comprising any one or more of benzene, toluene, o-xylene, m-xylene, p-xylene and mixed xylenes) and a methylating agent (selected from one or more of methyl alcohol, dimethyl ether and methane chloride) as raw materials to prepare unsym-trimethyl benzene by a methylation reaction under the catalytic action of an acid catalyst. The acid catalyst is selected from any one of halide, liquid acid, complexacid, heteropolyacid, solid super acid, acidic ion exchange resin, acidic oxide, hydrogenous zeolite molecular sieve or supported acid catalyst. The pressure of the methylation reaction is 0.01-10.0Mpa, the temperature is 30-700 DEG C, the mass space velocity of raw material liquid is 0.1-10.0h<-1>, and the mole ratio of the aromatic hydrocarbon and the methylating agent is 1:10 to 10:1. The methylation reaction can adopt a continuous fixed bed reaction or continuous stirred-tank reaction. The method has rich raw material resources, low cost, mild reaction condition as well as higher once-through conversion of the raw materials and yield of the unsym-trimethyl benzene.

Description

technical field [0001] The present invention relates to the specialty of organic synthesis in the field of chemical industry, in particular, relates to a method for synthesizing mesitylene by using BTX aromatics as raw material through methylation reaction, more specifically, using benzene, toluene or xylene as raw material The raw material is methanol, dimethyl ether or methylene chloride as a methylating agent, and is synthesized by a fixed-bed reactor or a tank reactor filled with an acid catalyst to obtain trimethylene. Background technique [0002] Trimethylbenzene is a colorless liquid, insoluble in water, soluble in ethanol, ether and benzene, with a boiling point of 169.35°C. Trimethylbenzene is widely used in fine chemicals. It is an ideal solvent for producing hydrogen peroxide by high-grade paint and anthraquinone method. It is also used for the production of trimellitic anhydride, 3,4-dimethylbenzaldehyde, mesitylene and durene important raw materials for produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/02C07C2/88C07C5/27
CPCY02P20/52
Inventor 文怀有孙以敏段礼敏许宁刘子玉谈赟
Owner SHANGHAI NOVEL CHEM TECH
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