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A reaction process for converting oxygenates to aromatics using moving bed technology

A moving bed reactor and compound technology, which is applied in the field of reaction technology, can solve the problems of low yield of total aromatics, strong reaction heat transfer and other problems, and achieve the effect of high activity and increased yield

Active Publication Date: 2015-09-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problems of low yield of total aromatics and strong heat transfer of reaction heat in the existing catalyst-containing aromatics technology, this goal can be achieved by using moving bed technology and recycling non-target products such as low-carbon hydrocarbons

Method used

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  • A reaction process for converting oxygenates to aromatics using moving bed technology
  • A reaction process for converting oxygenates to aromatics using moving bed technology

Examples

Experimental program
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Effect test

Embodiment 1

[0050] The raw material is methanol, the diluent is water (the total content of Na and K ions in the water is less than 60ppb), and the mass ratio of methanol to water is 1:5. The returned hydrocarbon, methanol and diluent are mixed and preheated to 300°C. Methanol in the imported gas The partial pressure is 0.05MPa, the catalyst is ZSM-5 molecular sieve modified by Ga and P, the content of Ga is 2wt%, the content of P is 5wt%, the average particle size of the catalyst particles is 1.5-3mm; the reaction temperature is 450℃, and the imported The pressure is 0.3MPa, and the space velocity is 0.1h -1 . The speed of the catalyst flowing through the moving bed reactor is set so that its residence time in the reactor is 20h. When the conversion rate of methanol is lower than 99%, the catalyst is sent to the regeneration zone for regeneration. The amount of coke deposited on the catalyst after regeneration is less than 0.5%. The product distribution of the catalyst in stable operat...

Embodiment 2

[0052] The raw material is methanol, the diluent is water (the total content of Na and K ions in the water is less than 60ppb), and the mass ratio of methanol to water is 10:1. The returned hydrocarbon, methanol and diluent are mixed and preheated to 500°C. Methanol in the imported gas Partial pressure is 0.1MPa, ZSM-5 molecular sieve modified by Zn and P is used as catalyst, Zn content is 6wt%, P content is 9wt%, average particle size of catalyst particles is 2-3mm; reaction temperature is 600℃, imported The pressure is 3MPa, and the space velocity is 1.5h -1 . The speed of the catalyst flowing through the moving bed reactor is set so that its residence time in the reactor is 300h. When the conversion rate of methanol is lower than 99%, the catalyst is sent to the regeneration zone for regeneration. The amount of coke deposited on the catalyst after regeneration is less than 0.5%. The product distribution of the catalyst in stable operation under this process is shown in Ta...

Embodiment 3

[0054] The raw material is methanol, the diluent is water (the total content of Na and K ions in the water is less than 60ppb), and the mass ratio of methanol to water is 1:10. The returned hydrocarbon, methanol and diluent are mixed and preheated to 380°C. Methanol in the imported gas The partial pressure is 0.01MPa, the catalyst is ZSM-5 molecular sieve modified by Ag and P, the content of Ag is 1wt%, the content of P is 3wt%, the average particle size of the catalyst particles is 1.5-3mm; the reaction temperature is 450℃, and the imported The pressure is 0.05MPa, and the space velocity is 1.0h -1 . The speed of the catalyst flowing through the moving bed reactor is set so that its residence time in the reactor is 100h. When the conversion rate of methanol is lower than 99%, the catalyst is sent to the regeneration zone for regeneration. The amount of coke deposited on the catalyst after regeneration is less than 0.5%. The product distribution of the catalyst in stable ope...

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Abstract

The invention discloses a reaction technology for converting an oxygen-containing compound into aromatic hydrocarbons by using a moving bed process. The technology comprises the following steps: preheating the oxygen-containing compound and a diluent, carrying out mixing preheating, reacting in the presence of an aromatization catalyst in an aromatization reactor in order to generate a mixed effluent, sending the mixed effluent to a cooling separation unit, carrying out dehydration and oxide removal, separating to obtain main products comprising benzene, toluene, xylene and other byproducts; circulating the other byproducts, benzene and toluene to the aromatization reactor as return hydrocarbons for a reaction; removing carbon-deposited aromatization catalyst particles from the aromatization reactor when the conversion rate of the oxygen-containing compound under the catalyst in the aromatization reactor is lower than 99%, regenerating in a regenerator, and adding the regenerated catalyst to the aromatization reactor. The technology improves the stability and the activity of the catalyst, and improves the selectivity of the aromatic hydrocarbons especially xylene through recycling product hydrocarbons.

Description

technical field [0001] The invention relates to a method for preparing aromatic hydrocarbons, in particular to a reaction process for converting oxygen-containing compounds into aromatic hydrocarbons using moving bed technology. Background technique [0002] Aromatics, especially light aromatics BTX (benzene, toluene, xylene) are important organic chemical raw materials. At present, BTX aromatics mainly come from petroleum resources, and the shortage of petroleum resources in my country determines the shortage of aromatics resources. There is an urgent need for a new technology to replace petrochemical production of aromatics, that is, to turn to the direct conversion of resource-rich methanol to produce Aromatics. This not only alleviates the shortage of aromatics resource demand, but also has great significance for increasing the added value of methanol downstream products, broadening the application field of methanol and extending the industrial chain of coal chemical ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/04C07C15/06C07C15/08C07C1/20C07C2/88
CPCY02P20/52Y02P20/584
Inventor 蒋斌波陆飞鹏廖祖维阳永荣王靖岱蒋云涛季来军冯翔黄正梁
Owner ZHEJIANG UNIV
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