Method for preparing propylene and aromatic hydrocarbon by virtue of conversion of methanol

A technology for producing propylene and methanol from methanol, which is applied in the production of hydrocarbons from oxygen-containing organic compounds, organic chemistry, ethylene production, etc., can solve problems such as inability to co-produce aromatics, and achieve the effect of improving yields

Active Publication Date: 2011-09-21
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem that the existing methanol conversion to propylene technology can only obtain propylene and cannot co-produce aromatics, and provides a new method for methanol conversion to produce propylene and aromatics

Method used

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  • Method for preparing propylene and aromatic hydrocarbon by virtue of conversion of methanol
  • Method for preparing propylene and aromatic hydrocarbon by virtue of conversion of methanol

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Experimental program
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Embodiment 1

[0021] according to figure 1 In the process flow shown, the raw material methanol enters the pre-reactor 2 through the pipeline 1, and the reaction conditions are controlled: the reaction temperature is 200°C, the reaction pressure is 0.1MPa, and the methanol weight space velocity is 1.0h -1 , at this moment, the conversion rate of methanol is 80%, and the selectivity of dimethyl ether is 100%. The reaction product dimethyl ether and unreacted methanol are mixed in pipeline 5 with water vapor coming from pipeline 4 through pipeline 3, and enter methanol-to-propylene reactor 6, wherein the catalyst composition is 88% HZSM-5, 0.02% P, and the rest As a binder, the control reaction conditions are: reaction temperature 420°C, reaction pressure 0.02MPa, H 2 O / CH 3 OH=1.50 / 1 (mass), methanol weight space velocity 2.0h -1 At this time, the conversion rate of methanol and dimethyl ether is 100%, the selectivity of propylene is 33%, the selectivity of ethylene is 13.2%, and the sele...

Embodiment 2

[0023]Process flow is with embodiment 1. The pre-reaction conditions are: reaction temperature 220°C, reaction pressure 0.05MPa, methanol weight space velocity 2.0h -1 At this time, the conversion rate of methanol is 82%, and the selectivity of dimethyl ether is 100%. The catalyst composition of methanol to propylene reaction is 80% HZSM-5, 1.0% P, and the rest is binder, the reaction temperature is 450°C, the reaction pressure is 0.05MPa, H 2 O / CH 3 OH=1 (mass), methanol weight space velocity 3.0h -1 At this time, the conversion rate of methanol and dimethyl ether is 100%, the selectivity of propylene is 34.5%, the selectivity of ethylene is 12%, and the selectivity of C4C5 is 36.5%. The rest except a small amount of methane and ethane are mainly liquid phase products. The composition of aromatization reaction catalyst is 70% HZSM-5, 0.2% Ga, the rest is binder, the reaction temperature is 530°C, the reaction pressure is 0.5MPa, and the weight space velocity is 3.0h -1 , ...

Embodiment 3

[0025] Process flow is with embodiment 1. The pre-reaction conditions are: reaction temperature 250°C, reaction pressure 0.08MPa, methanol weight space velocity 3.0h -1 At this time, the conversion rate of methanol is 84%, and the selectivity of dimethyl ether is 100%. The catalyst composition for the reaction of methanol to propylene is 75% HZSM-5, no P is added, the rest is binder, the reaction temperature is 480°C, the reaction pressure is 0.08MPa, H 2 O / CH 3 OH=1.5 / 1 (mass), methanol weight space velocity 4.0h -1 At this time, the conversion rate of methanol and dimethyl ether is 100%, the selectivity of propylene is 36.8%, the selectivity of ethylene is 11.2%, and the selectivity of C4C5 is 36%. The rest except a small amount of methane and ethane are mainly liquid phase products. The composition of aromatization reaction catalyst is 75% HZSM-5, 1.0% Ga, and the rest is binder, the reaction temperature is 550°C, the reaction pressure is 0.8MPa, and the weight space vel...

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Abstract

The invention relates to a method for preparing propylene and aromatic hydrocarbon by virtue of conversion of methanol, and the method is mainly used for solving the problem that the methanol is just converted into propylene and the aromatic hydrocarbon can not be co-produced in the prior art. The method comprises the following steps: 1) converting above 80% of methanol into dimethyl ether by virtue of pre-reaction; 2) feeding the generated diamethyl ether and residual methanol into a device for producing propylene from the methanol for reaction so as to obtain a material flow I which mainly comprises the propylene, ethylene and C4, C5, C6 and over-C6 hydrocarbons; 3) after the material flow I is separated, returning the ethylene back to the device for producing the propylene from the methanol for cycling reaction, and feeding C4 and C5 hydrocarbons into an aromatizing device for reaction so as to obtain a material flow II containing aromatic hydrocarbon; and 4) cooling the material flow II, separating a gas-phase product low-carbon hydrocarbons from a liquid-phase product, and separating the liquid product from the material flow I so as to obtain C6 and over-C6 hydrocarbons, mixing, extracting and separating so as to obtain the aromatic hydrocarbon and non-aromatic hydrocarbon. By using the technical scheme, the problem is well solved; and the method can be used in industrialproduction for preparing the ethylene and the aromatic hydrocarbon by virtue of conversion of methanol.

Description

technical field [0001] The invention relates to a method for producing propylene and aromatic hydrocarbons by converting methanol. Background technique [0002] Methanol is an important organic chemical raw material with wide application and rich sources. In addition to obtaining it from biomass, coal or natural gas is also an important raw material for methanol production. Many sets of methanol production devices using natural gas and coal as raw materials have been built and put into operation in my country , Methanol production is increasing year by year. Regarding the planning and construction of my country's methanol projects, although there are differences in various statistical data, the unanimous conclusion is that in a short period of time in the future, the production capacity of methanol will far exceed the actual demand. By 2010, the first batch of large-scale methanol plants After the production capacity is released, the emergence of excess methanol production ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C1/20C07C15/08C07C15/06C07C15/04
CPCY02P30/20Y02P30/40
Inventor 徐建军任丽萍滕加伟杨为民
Owner CHINA PETROLEUM & CHEM CORP
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