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A moving bed catalytic method for the methylation of aromatic hydrocarbons

A methylation and moving bed technology, which is applied in the field of moving bed catalysis for aromatic hydrocarbon methylation, can solve the problems of low methanol utilization, large temperature rise of the catalyst bed, and poor stability

Active Publication Date: 2015-09-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problems of large temperature rise, poor stability, discontinuous reaction and low methanol utilization rate of the catalyst bed in the prior art, and provides a new moving bed catalytic method for methylation of aromatic hydrocarbons

Method used

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  • A moving bed catalytic method for the methylation of aromatic hydrocarbons
  • A moving bed catalytic method for the methylation of aromatic hydrocarbons
  • A moving bed catalytic method for the methylation of aromatic hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0027] Alkylation reagent methanol first enters the fixed-bed reactor and contacts with the dehydration catalyst. The specific reaction conditions are shown in Table 1. The reaction generates mixed effluent I containing dimethyl ether, water and unreacted methanol; pure toluene raw material and mixed effluent I is mixed and vaporized to obtain a reaction mixture II; the reaction mixture II is sent to a moving bed reactor, so that the alkylation catalyst containing silicon-aluminum molecular sieves contacts with it during the downward movement to undergo an alkylation reaction. The reaction conditions are: The catalyst loading is 2000g, the reaction temperature is 400°C, and the toluene weight space velocity is 4.0h -1 , the molar ratio of methanol to toluene is 0.5, no hydrogen is present, the reaction pressure is 0.5MPa, and the alkylation catalyst used contains 15% by weight of SiO 2 Modifier, 75% hydrogen type ZSM-5 molecular sieve (silicon to aluminum molar ratio SiO 2 / A...

Embodiment 5～8

[0031] According to the steps and conditions described in Example 1, the aromatic hydrocarbon alkylation reaction is carried out, but the catalyst regeneration conditions are adjusted, and the specific regeneration conditions and evaluation results are listed in Table 2 for comparison. 1 is the same.

[0032] Table 2

[0033]

Embodiment 9～13

[0035] The methylation reaction was carried out according to the steps and conditions described in Example 5, and the catalyst type and methylation reaction conditions were changed. The specific reaction conditions and evaluation results are listed in Table 3 for comparison.

[0036] table 3

[0037]

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Abstract

The invention relates to a moving bed catalytic method of aromatics methylation, mainly solving the problems of high temperature rise of catalyst bed, bad stability, discontinuous reaction, and low utilization rate of methanol in the prior art. The method disclosed herein comprises the following steps: a) letting alkylation reagent methanol enter into a fixed bed reactor to contact with a dehydration catalyst for reacting to obtain a mixed effluent I; b) mixing aromatics raw material with the mixed effluent I to obtain a reaction mixture II; c) putting the reaction mixture II into a moving bed reactor, contacting the reaction mixture II with the alkylation reagent while the alkylation reagent moves downward to obtain a dimethylbenzene-rich reaction effluent III; d) delivering the catalyst to be regenerated coming from the moving bed reactor to a catalyst regenerator to conduct coking regeneration; and e) delivering the regenerated catalyst back to the moving bed reactor for recycling. The method disclosed herein well solves the problems and can be applied in the industrial production of p-xylene by aromatics methylation.

Description

technical field [0001] The invention relates to a moving bed catalytic 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 con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/08C07C2/86
CPCY02P20/584
Inventor 孔德金夏建超邹薇
Owner CHINA PETROLEUM & CHEM CORP