Fluidized catalytic method for preparing p-xylene by alkylating aromatic hydrocarbon

A technology for alkylation of aromatic hydrocarbons and p-xylene, which is used in the condensation of hydrocarbons and non-hydrocarbons to produce hydrocarbons, organic chemistry, etc., which can solve the problems of poor catalyst stability, slow reaction exothermic catalyst deactivation, and side reactions of alkylating reagents. more questions

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The present invention aims to solve the problems in the prior art that the raw material is single, the temperature rise of the reaction bed is large, the stability of the catalyst is poor, the side reactions of the alkylation reagent are many and the utilization rate is low, and a new ar

Method used

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  • Fluidized catalytic method for preparing p-xylene by alkylating aromatic hydrocarbon
  • Fluidized catalytic method for preparing p-xylene by alkylating aromatic hydrocarbon
  • Fluidized catalytic method for preparing p-xylene by alkylating aromatic hydrocarbon

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Experimental program
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Effect test

Embodiment 1～3

[0029] The alkylation reaction was carried out according to the steps and conditions described in Comparative Example 1, wherein benzene and toluene were mixed in different proportions as aromatic hydrocarbon raw materials. The specific reaction conditions and evaluation results are listed in Table 1 for comparison.

[0030] Table 1

[0031]

[0032] The data in Table 1 shows that, although benzene and toluene are used as mixed aromatics feed, although there is no effect on the control of the temperature rise of the catalyst bed, the side reactions of methanol itself and the deep alkylation reaction are still obviously suppressed, and the methyl utilization rate The selectivity of p-xylene and xylene was significantly improved, and the selectivity of p-xylene was slightly improved, while the conversion rate of aromatics decreased to a certain extent.

Embodiment 4～7

[0034] The alkylation reaction was carried out according to the steps and conditions described in Example 2, wherein the alkylating agent was a mixture of methanol and dimethyl ether. The specific reaction conditions and evaluation results are listed in Table 2 for comparison.

[0035] Table 2

[0036]

[0037]The data in Table 2 show that as the content of dimethyl ether in the alkylating reagent increases, the exothermic heat of the reaction and the temperature rise of the catalyst bed show a downward trend, thereby inhibiting the side reactions of the alkylating reagent itself, the deep alkylation reaction and the heterogeneous reaction. structuring reaction.

Embodiment 8～11

[0039] The alkylation reaction was carried out according to the steps and conditions described in Example 7, and the molar ratio of the methyl group and the aromatic hydrocarbon contained in the alkylating agent in the feed was changed. The specific reaction conditions and evaluation results are listed in Table 3 for comparison.

[0040] table 3

[0041]

[0042] The data in Table 3 show that the amount of alkylating agent has a great influence on various performance indicators. The larger the amount of alkylating agent is, the higher the conversion rate of aromatics is, but the worse the product selectivity and methyl utilization rate are.

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Abstract

The invention relates to a fluidized catalytic method for preparing p-xylene by alkylating aromatic hydrocarbon. By the fluidized catalytic method, the problems of single raw materials, high temperature rise of a reaction bed, poor stability of a catalyst, multiple side reactions of an alkylating reagent and a low utilization rate in the prior art are mainly solved. In the fluidized catalytic method, methanol, dimethyl ether, benzene and toluene are subjected to mixed feeding, and the dimethyl ether is used as the alkylating reagent. Through the technical scheme, the problems are better solved. The fluidized catalytic method can be applied to industrial production of the p-xylene by performing alkylation reaction on the aromatic hydrocarbon.

Description

technical field [0001] The invention relates to a fluidized catalytic method for producing p-xylene by alkylation of aromatic hydrocarbons. Background technique [0002] P-xylene is an important organic chemical raw material. Its main purpose is to synthesize terephthalic acid through oxidation, and then conduct polycondensation reaction with ethylene glycol to produce polymer materials polyethylene terephthalate (polyester), polyester It is a polyester material with excellent performance and great demand, which is widely used in the fields of textile and packaging materials. [0003] At present, the most commonly used p-xylene production method in industry is disproportionation of toluene and transalkylation of C-nine aromatic hydrocarbons. Due to the limitation of thermodynamic equilibrium, the C-eight aromatic hydrocarbon products obtained by this method usually only contain about 24% p-xylene, while Demand for xylene The demand for p-xylene in the market accounts for mo...

Claims

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Application Information

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IPC IPC(8): C07C15/08C07C2/86
Inventor 夏建超邹薇李辉孔德金
Owner CHINA PETROLEUM & CHEM CORP
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