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System and method for high-selectivity preparation of xylene from methanol and oriented conversion of xylene isomer

A directional transformation and high selectivity technology, applied in chemical instruments and methods, isomerization hydrocarbon production, catalysts, etc., can solve the problems of complex reaction process, low xylene selectivity, and low comprehensive utilization rate of by-products, and achieve Improve selectivity and yield, ensure conversion and utilization, and improve the effect of comprehensive utilization

Active Publication Date: 2021-06-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using Methanol and C 1 ~C 12 One or several mixtures in the aromatization reaction have improved the selectivity of the target product dimethylbenzene, but the reaction raw material cost is higher, the reaction process is more complicated and can not flexibly prepare the dimethylbenzene product of a single structure (para-position, ortho or meta)
[0008] In summary, methanol aromatization, as a technology with huge potential economic benefits, has made some progress in recent years, but the current research on aromatization mainly focuses on the aromatization reaction stage. There are few follow-up treatment studies, and the obtained products are mainly mixed aromatic hydrocarbons. There are generally problems of low xylene selectivity and low comprehensive utilization rate of by-products, and there is currently no xylene product type (para-position, ortho-position or meta) flexible control method and process

Method used

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  • System and method for high-selectivity preparation of xylene from methanol and oriented conversion of xylene isomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Such as figure 1 Shown, a kind of system that is used for methanol highly selective preparation xylene and xylene isomer directional conversion, system comprises following device:

[0067] A methanol aromatization reaction unit (R-1), which is used to perform an aromatization reaction on the raw material methanol to generate an aromatization product, and the aromatization product contains an aromatic hydrocarbon mixture of benzene, toluene, xylene and / or trimethylbenzene;

[0068] The three-phase separation unit (D-1) is used to separate the aromatized product extracted from the methanol aromatization reaction unit into an aromatized gas phase product, an aromatized oil phase product and an aromatized water phase product;

[0069] Debenzene tower unit (T-1), detoluene tower unit (T-2) and dexylene tower unit (T-3), debenzene tower unit (T-1), detoluene tower unit (T-2) It is connected in series with the de-xylene tower unit (T-3) in sequence, and is used to send the ar...

Embodiment 2

[0094] A system for producing xylene with high selectivity of methanol and directional conversion of xylene isomers is the same as in Example 1.

[0095] The specific process steps (1)-(4) with OX (o-xylene) as the target product are the same as in Example 1.

[0096] The difference is that in step (5), the xylene mixed isomers withdrawn from the top of the de-xylene tower unit (T-3) are sent to the xylene isomerization reaction unit (R-4), and the Directional conversion of mixed isomers of xylene to products containing OX (orth-xylene isomer). Subsequently, the product containing OX generated by the xylene isomerization reaction unit (R-4) is sent to the xylene separation tower unit (T-5), the product in the tower is OX, and the top product is returned to the xylene isomerization Reaction unit (R-4);

[0097] The xylene isomerization reaction unit (R-4) adopts a fixed bed reactor, the reaction temperature is 450°C, the reaction pressure is normal pressure, and the mass spac...

Embodiment 3

[0099] A system for producing xylene with high selectivity of methanol and directional conversion of xylene isomers is the same as in Example 1.

[0100] The specific process steps (1)-(4) with MX (m-xylene) as the target product are the same as in Example 1.

[0101] The difference is that in step (5), the xylene mixed isomers withdrawn from the top of the de-xylene tower unit (T-3) are sent to the xylene isomerization reaction unit (R-4), and the Directional conversion of mixed isomers of xylene to products containing MX (m-xylene isomer). Subsequently, the product containing MX generated by the xylene isomerization reaction unit (R-4) is sent to the xylene separation tower unit (T-5), the product in the tower is MX, and the overhead product is returned to the xylene isomerization Reaction unit (R-4);

[0102] The xylene isomerization reaction unit (R-4) adopts a fixed bed reactor, the reaction temperature is 450°C, the reaction pressure is normal pressure, and the mass sp...

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Abstract

The invention provides a system and a method for high-selectivity preparation of xylene and oriented conversion of xylene isomers by taking methanol as a raw material. The system comprises the following devices: a methanol aromatization reaction unit (R-1), a three-phase separation unit (D-1), a debenzolization tower unit (T-1), a toluene removal tower unit (T-2), a xylene removal tower unit (T-3), a benzene-toluene alkylation reaction unit (R-2), a toluene-trimethylbenzene transalkylation reaction unit (R-3); and a xylene isomerization reaction unit (R-4). Through the system and the method, the type of the xylene product can be flexibly and effectively controlled, the xylene isomer product with a single structure (para-position, ortho-position or meta-position) or with a preset proportion according to requirements can be obtained, and the system and the method have the characteristics of complete process, low cost, high xylene yield and flexible product scheme.

Description

technical field [0001] The invention relates to the field of chemical engineering for producing xylene from methanol, in particular to a system and method for highly selective preparation of xylene and directional conversion of xylene isomers using methanol as a raw material. Background technique [0002] Aromatic hydrocarbons account for about 30% of the 8 million known organic compounds, and are important basic raw materials for the petrochemical industry. Among them, BTX aromatic hydrocarbons (benzene, toluene and xylene) are called first-class organic basic raw materials, and their output is second only to ethylene and propylene. Their derivatives can be used to produce various chemical products such as rubber, chemical fiber and plastics. In my country occupies a very important position in the national economy. Among the BTX aromatic hydrocarbons, PX (para-xylene) has the largest demand and is mainly used as a raw material for the production of polyester resin and polye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C5/27C07C15/08C07C15/06C07C15/04C07C7/04
CPCC07C1/20C07C5/2754C07C7/04C07C2529/46C07C2529/40C07C15/08C07C15/06C07C15/04C07C15/02Y02P20/52
Inventor 李建伟陈杰张艳君张佳瑾
Owner BEIJING UNIV OF CHEM TECH
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