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Fluidized catalytic method for preparing p-xylene by alkylating toluene

A technology for para-xylene and toluene alkyl is applied in the field of fluidized catalysis for the production of para-xylene by alkylation of toluene, and can solve the problems of low utilization rate, many side reactions of alkylating reagents, large temperature rise of catalyst bed and the like

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

[0013] The present invention aims to solve the problems of large catalyst bed temperature rise, many side reactions of alkylation reagents and low utilization rate in the prior art, and provides a new fluidized catalytic method for producing p-xylene by alkylation of toluene

Method used

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  • Fluidized catalytic method for preparing p-xylene by alkylating toluene
  • Fluidized catalytic method for preparing p-xylene by alkylating toluene
  • Fluidized catalytic method for preparing p-xylene by alkylating toluene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0026] The alkylation reaction of toluene was carried out according to the steps and conditions described in the comparative example, wherein the alkylating agent was changed to a mixture of different ratios of methanol and dimethyl ether. The specific ratios and reaction evaluation results are listed in Table 1 for comparison.

[0027] Table 1

[0028]

[0029] The data in Table 1 shows that after using dimethyl ether to partially replace methanol as the alkylation reagent, the heat release in the alkylation process and the temperature rise of the catalyst bed are effectively controlled, resulting in significant xylene selectivity and p-xylene selectivity. The utilization rate of methanol also increased slightly, and the conversion rate of aromatics changed little.

Embodiment 4～6

[0031] The toluene alkylation reaction was carried out according to the steps and conditions described in Example 3, and the ratio of methyl to toluene contained in the alkylating agent was changed. The specific reaction conditions and evaluation results are listed in Table 2 for comparison.

[0032] Table 2

[0033]

[0034] The data in Table 2 show that the higher the methyl / toluene ratio, the lower the methyl utilization rate, the bed temperature rise control, xylene selectivity and p-xylene selectivity all have varying degrees of deterioration, while the aromatics conversion rate has a large Increase.

Embodiment 7～11

[0036] The toluene alkylation reaction was carried out according to the steps and conditions described in Example 3, and the reaction temperature, pressure, toluene space velocity, hydrogen / toluene ratio and other conditions were changed. The specific reaction conditions and evaluation results are listed in Table 3 for comparison.

[0037] table 3

[0038]

[0039]The data in Table 3 show 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 79.97%, the selectivity of p-xylene can be up to 93.32%, the utilization rate of methanol can be up to 68.22%, and the temperature rise can be lowered to 18.3°C.

[0040] Comparing the data of the above examples, we found that the fluidized catalytic method for producing p-xylene through the alkylation of toluene according to the present inven...

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Abstract

The invention relates to a fluidized catalytic method for preparing p-xylene by alkylating toluene. By the fluidized catalytic method, the problems of high temperature rise of a catalyst bed, 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 and toluene are subjected to mixed feeding, and the dimethyl ether partially replaces the methanol to be 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 toluene serving as a raw material.

Description

technical field [0001] The invention relates to a fluidized catalytic method for preparing p-xylene by alkylation of toluene. 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 more than 60%, s...

Claims

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Application Information

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IPC IPC(8): C07C15/08C07C2/88B01J8/24
Inventor 夏建超李辉孔德金
Owner CHINA PETROLEUM & CHEM CORP
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