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Fluidized catalytic method of p-xylene by methylation of aromatic hydrocarbon

A p-xylene and fluidized catalysis technology, which is applied in the fields of condensation between hydrocarbons and non-hydrocarbons, organic chemistry, bulk chemical production, etc., can solve the problem of high temperature rise of the reaction bed, low utilization rate, and poor catalyst stability And other issues

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

AI Technical Summary

Problems solved by technology

[0015] The present invention aims to solve the problems in the prior art that 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. catalytic method

Method used

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  • Fluidized catalytic method of p-xylene by methylation of aromatic hydrocarbon
  • Fluidized catalytic method of p-xylene by methylation of aromatic hydrocarbon
  • Fluidized catalytic method of p-xylene by methylation of aromatic hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0028] According to the steps and conditions described in Comparative Example 1, the aromatic hydrocarbon methylation reaction was carried out, wherein the pure toluene feed was replaced by a mixture of benzene and toluene, and dimethyl ether was used as an alkylating agent instead of methanol. The molar ratio of dimethyl ether to aromatic hydrocarbon is 0.25. The specific reaction conditions and evaluation results are listed in Table 1 for comparison.

[0029] Table 1

[0030]

[0031] The data in Table 1 show that, compared with methanol, the use of dimethyl ether as an alkylating agent significantly reduces the temperature rise of the catalyst bed. Using benzene and toluene as the mixed aromatics feed, although it has no effect on the control of the temperature rise of the catalyst bed, the side reaction of methanol itself and the deep alkylation reaction are still obviously suppressed, and the methyl utilization rate and xylene selectivity Significantly increased, p-x...

Embodiment 5～8

[0033] The aromatic hydrocarbon methylation reaction was carried out according to the steps and conditions described in Example 3, and the molar ratio of dimethyl ether to aromatic hydrocarbon feed was changed. The specific reaction conditions and evaluation results were listed in Table 2 for comparison.

[0034] Table 2

[0035]

[0036] The data in Table 2 shows that the amount of alkylating agent has a great influence on various performance indicators. The larger the amount is, the higher the conversion of aromatics is, but the worse the product selectivity and methyl utilization are.

Embodiment 9～14

[0038] The aromatic hydrocarbon methylation reaction was carried out according to the steps and conditions described in Example 3, and the reaction temperature, space velocity, hydrogen / aromatic hydrocarbon molar ratio and reaction pressure were adjusted. The specific reaction conditions and evaluation results were listed in Table 3 for comparison.

[0039] table 3

[0040]

[0041] The data in Table 3 shows that the alkylation reaction conditions have a great influence on the product distribution, and also have an influence on the temperature rise of the catalyst bed. Through the above process optimization, the selectivity of xylene can be raised up to 91.67%, the selectivity of p-xylene can be up to 88.17%, the utilization rate of methanol can be up to 78.89%, and the temperature rise can be as low as 17.5°C.

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Abstract

The invention relates to a fluidized catalytic method of p-xylene by methylation of aromatic hydrocarbon, and mainly solves the problems of high temperature rise of a reaction bed, poor catalyst stability, more side reaction of an alkylation reagent and low utilization rate in the prior art. According to the technical scheme, dimethyl ether and aromatic hydrocarbon are used as mixing feeds and dimethyl ether is used as the methylation reagent. The technical scheme greatly solves the problems and can be applied in the industrial production of p-xylene by methylation reaction of aromatic hydrocarbon.

Description

technical field [0001] The invention relates to a fluidized catalytic method for producing p-xylene through methylation 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/08C07C2/86
CPCY02P20/52
Inventor 夏建超李经球孔德金
Owner CHINA PETROLEUM & CHEM CORP
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