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Method for preparing aromatic hydrocarbons

A technology for aromatic hydrocarbons and carbon monoxide, applied in chemical instruments and methods, hydrocarbon production from oxygen-containing organic compounds, including molecular sieve catalysts, etc., can solve the problems of rapid decrease in aromatics selectivity, easy sublimation or aggregation of metals, and low BTX selectivity, etc. To achieve the effect of being beneficial to environmental protection, stable selectivity, and simplifying the process

Active Publication Date: 2018-05-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

Among the technologies for producing aromatics in the coal chemical industry, the technology of producing aromatics from coal chemical platform product methanol (MTA) is the most extensively studied Catalysts, however, under high temperature conditions, metals are easy to sublimate or aggregate, the selectivity of aromatics decreases rapidly, the catalyst life is short, the selectivity of BTX is not high, and the performance of the catalyst decreases significantly after regeneration, etc., restricting the large-scale industrial application of methanol to aromatics technology

Method used

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  • Method for preparing aromatic hydrocarbons

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Embodiment 1

[0035] The 10g Si / Al=19 (atomic ratio) hydrogen-type ZSM-5 molecular sieve purchased by Nankai University Catalyst Factory, referred to as HZSM-5(19), was sieved into 20-40 mesh particles after tableting, and the inner diameter was 16mm. In a stainless steel reaction tube, use 100ml / min nitrogen to activate at 550°C for 4h, and react under the following conditions: reaction temperature (T)=350°C, reaction pressure (P)=0.5MPa, methanol mass space velocity (WHSV)=0.01h -1 , carbon monoxide:methanol (CO:MeOH)=1:1. After the reaction was stable, the product was analyzed by gas chromatography, and the reaction results are shown in Table 1.

Embodiment 2

[0037] 10g of hydrogen-type ZSM-5 molecular sieve with Si / Al=200 (atomic ratio) purchased by Nankai University Catalyst Factory, referred to as HZSM-5(200) for short, was sieved into 20-40 mesh particles after tableting, and the inner diameter was 16mm In a stainless steel reaction tube, use 100ml / min nitrogen to activate at 550°C for 4h, and react under the following conditions: reaction temperature (T)=550°C, reaction pressure (P)=10MPa, methanol mass space velocity (WHSV)=20h -1 , carbon monoxide:methanol (CO:MeOH)=100:1. After the reaction was stable, the product was analyzed by gas chromatography, and the reaction results are shown in Table 1.

Embodiment 3

[0039] The 10g Si / Al=4 (atomic ratio) hydrogen-type ZSM-5 molecular sieve purchased by Shanghai Zhuoyue Co., Ltd., referred to as HZSM-5(4) for short, was sieved into 20-40 mesh particles after tableting, and packed into a 16mm inner diameter In a stainless steel reaction tube, use 100ml / min nitrogen to activate at 550°C for 4h, and react under the following conditions: reaction temperature (T)=450°C, reaction pressure (P)=5MPa, methanol mass space velocity (WHSV)=2h -1 , carbon monoxide:methanol (CO:MeOH)=40:1. After the reaction was stable, the product was analyzed by gas chromatography, and the reaction results are shown in Table 1.

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Abstract

The invention discloses a method for preparing aromatic hydrocarbons, and particularly relates to a method for preparing the above aromatic hydrocarbons by using methanol and carbon monoxide to pass through a reactor carrying an acidic ZSM-5 molecular sieve catalyst free of a metal auxiliary agent under reaction conditions. Compared with the prior art, the method provided by the invention adds thecarbon monoxide in a methanol aromatization reaction, so that the selectivity of the aromatic hydrocarbons, especially BTX, can be improved and stabilized, and the single-pass service life of the catalyst is prolonged; after the deactivated catalyst is subject to regeneration for a plurality of times, the performance is not significantly reduced; and the catalyst preparation process omits the step of adding the metal auxiliary agent, so that the process is simplified, the costs are greatly saved, and the method is beneficial for environmental protection.

Description

technical field [0001] The invention relates to a method for preparing aromatic hydrocarbons, in particular to preparing the aromatic hydrocarbons by using methanol and carbon monoxide through a catalyst loaded with acidic ZSM-5 molecular sieves without metal additives. Background technique [0002] Aromatics, especially Benzene, Toluene and Xylene, collectively referred to as BTX, are important organic chemical raw materials in output and scale after ethylene and propylene, and their derivatives are widely used in fuel, petrochemical, Chemical products and fine chemicals such as chemical fiber, plastic and rubber. [0003] At present, aromatics are mainly produced from petroleum, and 70% of BTX aromatics in the world come from catalytic reforming process units of refineries. Catalytic reforming technology uses naphtha as raw material, adopts semi-regenerative and continuous regenerative reforming process types, and catalytic reforming generally uses platinum-containing cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C15/02C07C15/04C07C15/06C07C15/08
CPCC07C1/20C07C2529/40C07C15/02C07C15/04C07C15/06C07C15/08Y02P20/52Y02P20/584B01J29/40B01J29/90B01J38/14C07C1/22
Inventor 倪友明朱文良陈之旸刘勇刘红超马现刚刘世平刘中民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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