Methanol or dimethyl ether and method for preparing dimethylbenzene by using methylbenzene

A technology of dimethyl ether and xylene, which is applied in the field of preparation of p-xylene, and can solve the problems of low yield of xylene

Active Publication Date: 2012-05-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The prior art all has the problem that xylene yield is low, and the present invention solves this problem in a targeted manner

Method used

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  • Methanol or dimethyl ether and method for preparing dimethylbenzene by using methylbenzene
  • Methanol or dimethyl ether and method for preparing dimethylbenzene by using methylbenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] in such as figure 1 On the reaction device shown, the catalyst is ZSM-5, SiO 2 / Al 2 o 3 The molar ratio is 20, methanol and toluene enter the reaction zone of the fast fluidized bed reactor, and contact with the catalyst to generate a product stream including xylene. After gas-solid separation, the product stream enters the separation section, and the catalyst enters the second dense phase bed. Be that 75% toluene (all the other are steam) contact with mass fraction, the catalyst of the second dense phase bed is divided into two parts, and 60% returns to described reaction zone, and 40% enters stripper, after steam stripping Enter the regenerator for regeneration, and the catalyst regenerated by the regenerator returns to the reaction zone, and the regenerator type is a riser. The weight ratio of toluene to methanol is 1:1, and the bed density in the reaction zone of the fluidized bed reactor is 150 kg / m 3 , the bed density of the second dense bed is 200 kg / m 3, T...

Embodiment 2

[0026] According to the conditions and steps described in Example 1, the catalyst is ZSM-5, SiO 2 / Al 2 o 3 The molar ratio is 200, methanol and toluene enter the reaction zone of the fast fluidized bed reactor, and contact with the catalyst to generate a product stream including xylene. After gas-solid separation, the product stream enters the separation section, and the catalyst enters the second dense phase bed. Contact with toluene (all the rest are water vapor) that mass fraction is 75%, the catalyst of the second dense phase bed is divided into two parts, and 90% returns to described reaction zone, and 10% enters stripper, after steam stripping Enter the regenerator for regeneration, and the catalyst regenerated by the regenerator returns to the reaction zone, and the regenerator type is a riser. The weight ratio of toluene to methanol is 6:1, and the bed density in the reaction zone of the fluidized bed reactor is 50 kg / m 3 , the bed density of the second dense bed i...

Embodiment 3

[0028] According to the conditions and steps described in Example 1, the catalyst is ZSM-5, SiO 2 / Al 2 o 3 The molar ratio is 100. Methanol, dimethyl ether and toluene enter the reaction zone of the fast fluidized bed reactor and contact with the catalyst to generate a product stream including xylene. After gas-solid separation, the product stream enters the separation section, and the catalyst enters the second The dense phase bed is contacted with 95% toluene (the rest is water vapor) with a mass fraction, and the catalyst in the second dense phase bed is divided into two parts, 80% is returned to the reaction zone, and 20% enters the stripper, passes through water After the steam is stripped, it enters the regenerator for regeneration, and the catalyst regenerated by the regenerator returns to the reaction zone. The regenerator type is a riser. The weight ratio of toluene to methanol and dimethyl ether is 4:1:1, and the bed density in the reaction zone of the fluidized b...

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Abstract

The invention relates to methanol or dimethyl ether and a method for preparing dimethylbenzene by using methylbenzene and mainly solves the problem of lower yield of dimethylbenzene in the prior art. The method better solves the problem and can be applied to the industrial production of the dimethylbenzene by adopting the technical scheme which mainly comprises the following steps of: (1) leading at least one of the methanol or dimethyl ether and methylbenzene to enter a reaction zone of a rapid fluid bed reactor to contact with a catalytic agent, generating product flow comprising dimethyl ether, after carrying out gas-solid seperation on the product flow, leading the product flow to enter a seperation working section, and leading the catalytic agent to enter a second dense bed to contact with a fluidizing agent; (2) dividing the catalytic agent of the second dense bed into at least two parts, wherein the first part returns to the reaction zone, the second part enters a stripper and enters a regenerator to be regenerated after being subjected to the steam stripping of water vapor; (3) leading the catalytic agent regenerated by the generator to return to the reaction zone; the fluidizing agent comprises the methylbenzene with at least 50% of mass fraction; and the regenerator adopts the type of a raising pipe.

Description

technical field [0001] The invention relates to a method for preparing xylene from methanol or dimethyl ether and toluene, and is especially suitable for the method for preparing p-xylene from methanol or dimethyl ether and toluene. Background technique [0002] Xylene is an important basic raw material, especially p-xylene. P-xylene is the basic raw material for synthetic polyester (PET). Currently, p-xylene production mainly uses toluene, C 9 Aromatics and mixed xylenes are used as raw materials, and are prepared by disproportionation, isomerization, adsorption separation or cryogenic separation. Since the p-xylene content in its products is thermodynamically controlled, p-xylene is at C 8 Mixed aromatics only account for about 24%, and the material circulation volume in the process is very large, and the operating cost is relatively high. In recent years, many patents at home and abroad have disclosed many new routes for preparing p-xylene. Among them, the technology o...

Claims

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Application Information

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IPC IPC(8): C07C15/08C07C2/88
CPCY02P20/584
Inventor 齐国祯钟思青李晓红王华文
Owner CHINA PETROLEUM & CHEM CORP
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