Method for preparing dimethylbenzene from oxygen-containing compound and methylbenzene

A xylene and compound technology, applied in the field of preparation of p-xylene, can solve the problem 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,

Method used

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  • Method for preparing dimethylbenzene from oxygen-containing compound and methylbenzene
  • Method for preparing dimethylbenzene from oxygen-containing compound and 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, the first part of the raw material enters the reactor from the bottom of the fluidized bed reactor, and the second part of the raw material enters the reactor from a feed port separated in the axial direction of the fluidized bed reactor, and the feed port is located at 1 / 3 of the height of the reaction zone from the bottom of the reaction zone is in contact with the fluidized bed catalyst to generate products including xylene, and the bed density of the fluidized bed reactor is 50 kg / m 3 , the first part of the raw material is toluene and water vapor, the weight ratio of water vapor to toluene is 0.2:1, the second part of the raw material is a mixture of methanol and toluene, and the weight ratio of methanol to toluene is 1:1. The reaction pressure is 0.01MPa in terms of gauge pressure, the reaction temperature is 325°C, the gas phase velocity is 1.8 m / s, ...

Embodiment 2

[0026] According to the conditions and steps described in Example 1, catalyst SiO 2 / Al 2 o 3The molar ratio is 200, the first part of the raw material enters the reactor from the bottom of the fluidized bed reactor, and the second part of the raw material enters the reactor from two inlets separated in the axial direction of the fluidized bed reactor, and the two inlets The feed ports are respectively located at 1 / 3 and 1 / 2 height of the reaction zone from the bottom of the reaction zone, and the feed volumes of the two feed ports are equal, and contact with the fluidized bed catalyst to generate products including xylene. The fluidized bed reactor The bed density is 80 kg / m 3 , the first part of the raw material is toluene and water vapor, the weight ratio of water vapor to toluene is 0.1:1, the second part of the raw material is a mixture of methanol and toluene, and the weight ratio of methanol to toluene is 2:1. The reaction pressure is 0.01MPa in terms of gauge pressu...

Embodiment 3

[0028] According to the conditions and steps described in Example 1, catalyst SiO 2 / Al 2 o 3 The molar ratio is 100, the first part of the raw material enters the reactor from the bottom of the fluidized bed reactor, the second part of the raw material enters the reactor from three feeding ports separated in the axial direction of the fluidized bed reactor, and the three feeding ports The feeding ports are respectively located at 1 / 4, 1 / 2, and 2 / 3 of the height of the reaction zone from the bottom of the reaction zone, and the feeding volumes of the three feeding ports are equal, and contact with the fluidized bed catalyst to generate products including xylene, flow The bed density of the chemical bed reactor is 200 kg / m 3 , the first part of the raw material is toluene and water vapor, the weight ratio of water vapor to toluene is 0.01:1, the second part of the raw material is a mixture of methanol and toluene, and the weight ratio of methanol to toluene is 10:1. The reac...

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Abstract

The invention relates to a method for preparing dimethylbenzene from oxygen-containing compound and methylbenzene. The problem that the yield of the dimethylbenzene is lower in the prior art is solved. The method comprises the following steps that: a first part of raw material enters a reactor from the bottom of a fluidized bed reactor, and a second part of raw material enters the reactor from at least one material inlet isolated in the axial direction of the fluidized bed reactor to be in contact with a fluidized bed catalyst to generate a product containing the dimethylbenzene under an effective condition, wherein the density of the bed layer of the fluidized bed reactor is 50 to 500kg/m<3>, the first part of raw material is methylbenzene and water vapor, the weight ratio between the water vapor and the methylbenzene is (0.01-0.2):1, the second part of raw material is a mixture of methanol or dimethyl ether and methylbenzene, and the weight ratio between the methanol or dimethyl ether and the methylbenzene is (1-10):1. The problem is better solved through the technical scheme and the method can be applied to the industrial production of the dimethylbenzene.

Description

technical field [0001] The invention relates to a method for preparing xylene from oxygen-containing compounds 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 ...

Claims

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Application Information

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IPC IPC(8): C07C15/08C07C2/88
CPCC07C2/864C07C15/08
Inventor 齐国祯钟思青王华文
Owner CHINA PETROLEUM & CHEM CORP
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