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Fluidized bed method for arene methylation

A methylation and fluidized bed technology, applied in the fluidized bed field of aromatic hydrocarbon methylation, can solve the problems of large temperature rise of the reaction bed, poor catalyst stability, and many side reactions of alkylating reagents, etc.

Inactive 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] What the present invention aims to solve are the problems of high reaction bed temperature rise, poor catalyst stability, many side reactions of alkylation reagents and low utilization rate in the prior art, and provide a new process for producing paraxylene by alkylation of aromatic hydrocarbon chemical bed method

Method used

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  • Fluidized bed method for arene methylation
  • Fluidized bed method for arene methylation
  • Fluidized bed method for arene methylation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0032] Aromatic hydrocarbon methylation was carried out according to the steps and conditions described in Comparative Example 1, wherein the alkylating agent used dimethyl ether instead of methanol, the aromatic hydrocarbon feed was a mixture of benzene and toluene, and the molar ratio of dimethyl ether to aromatic hydrocarbon was 0.25. The specific reaction conditions and evaluation results are listed in Table 1 for comparison.

[0033] Table 1

[0034]

[0035] 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-xylene selectivity slight...

Embodiment 5～8

[0037] The aromatic hydrocarbon methylation reaction was carried out according to the steps and conditions described in Example 3, but 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.

[0038] Table 2

[0039]

[0040] 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

[0042] 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 conditions were adjusted. The specific reaction conditions and evaluation results are listed in Table 3 for comparison.

[0043] table 3

[0044]

[0045] 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 92.45%, the selectivity of p-xylene can be up to 89.73%, the utilization rate of methanol can be up to 82.25%, and the temperature rise can be lowered to 12.9°C.

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Abstract

The invention relates to a fluidized bed method for arene methylation and mainly solves problems of large temperature rise of a reaction bed layer, weak stability of a catalyst, several side reactions of an alkylation reagent and low utilization rate of a prior art. According to the invention, mixed feeding of part of dimethyl ether and arene is employed; and remaining dimethyl ether feeding, in form of one stream or a plurality of streams, is introduced into a reactor from one or a plurality of positions at a downstream of a fluidized bed reactor inlet. The above technical scheme well solves the problems and can be applied to industrial production of preparation of paraxylene through an arene methylation reaction.

Description

technical field [0001] The invention relates to a fluidized bed method for aromatic hydrocarbon methylation. 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%, so this concentrat...

Claims

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Application Information

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IPC IPC(8): C07C15/08C07C2/88C07C5/27
Inventor 孔德金夏建超邹薇李辉
Owner CHINA PETROLEUM & CHEM CORP
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