Process for preparing dimethylbenzene by aromatization of methanol

A xylene and aromatization technology, applied in the production of hydrocarbons from oxygen-containing organic compounds, organic chemistry, bulk chemical production, etc., can solve the problems of low yield of carbon-based xylene in one pass

Active Publication Date: 2010-03-17
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] From the above review, it can be seen that in recent years, the methanol-to-aromatics technology has made some progress, but the single-pass carbon-based xylene yield of methanol conversion is low, and the highest is only about 30%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Carry out aromatization reaction in fixed-bed reactor, catalyst is the ZSM-5 molecular sieve with Zn and P modification, and wherein Zn content is 3wt%, and P content is 5wt%; Feeding is the mixture of methanol and propylene, methanol and The mass ratio of propylene is 5; the reaction temperature is 450°C, the reaction pressure is 0.15MPa, and the weight space velocity is 1.5hr -1 . During the stable period of catalyst activity, the average yield of total aromatics was 64.25%, and the average yield of xylene was 34.20%.

Embodiment 2

[0017] Carry out aromatization reaction in one stage fluidized bed reactor, catalyzer is the ZSM-35 molecular sieve with Ga and Cu modification, and wherein Ga content is 5wt%, and Cu content is 1wt%; Feeding is the mixture of methanol and methane, The mass ratio of methanol to methane is 100; the reaction temperature is 650°C, the reaction pressure is 1MPa, and the weight space velocity is 1.0hr -1 . During the stable period of catalyst activity, the average yield of total aromatics was 60.32%, and the average yield of xylene was 31.25%.

Embodiment 3

[0019] The aromatization reaction is carried out in a fluidized bed reactor, the catalyst is ZSM-11 molecular sieve modified with Cr and Pt, wherein the Cr content is 5wt%, and the Pt content is 0.5wt%; the feed is a mixture of methanol and propane , the mass ratio of methanol to propane is 2; the reaction temperature is 650°C, the reaction pressure is 3MPa, and the weight space velocity is 1.2hr -1 . During the stable period of catalyst activity, the average yield of total aromatics was 62.32%, and the average yield of xylene was 32.15%.

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PUM

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Abstract

A process for preparing dimethylbenzene by aromatization of methanol relates to a process for preparing dimethylbenzene by conducting aromatization reaction in a methanol aromatization reactor with methanol and hydrocarbon as raw materials. The process uses a metal-modified molecular sieve composite material as catalyst and causes the mixture of methanol and one or a plurality of C1-C12 hydrocarbons to conduct aromatization reaction in the methanol aromatization reactor. By adjusting the ratio between methanol and hydrocarbons in the raw material, the process regulates and controls the coordination between aromatization and alkylation reaction and realizes the purposes of effectively improving the yield of the target product dimethylbenzene and prolonging the service cycle of catalyst.

Description

technical field [0001] The invention relates to a process for producing xylene, in particular to a process for producing xylene by aromatizing methanol and hydrocarbons in a methanol aromatization reactor, which belongs to the production of basic organic chemical raw materials technology field. Background technique [0002] Aromatic hydrocarbons refer to hydrocarbons containing benzene rings. Triphenyl (benzene, toluene and xylene, also known as BTX) in aromatic hydrocarbons is the basic raw material of organic chemical industry and is widely used in synthetic fibers, synthetic resins, synthetic rubbers and various fine chemicals. products; with the development of the chemical industry, the current market demand for aromatics, especially xylene, is very strong. The source of aromatics is mainly from catalytic reforming process, naphtha cracking process, low-carbon hydrocarbon aromatization and aromatics conversion process in petrochemical industry; only a small part comes f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/08C07C1/20C07C2/86
CPCY02P20/52
Inventor 魏飞汤乐萍骞伟中汤效平孙玉建巩东奇田涛
Owner TSINGHUA UNIV
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