Method for producing propylene from methanol or dimethyl ether

A dimethyl ether and propylene technology, applied in ethylene production, bulk chemical production, chemical instruments and methods, etc., can solve the problems of unstable operation, fluctuating reaction conditions, catalyst deactivation, etc., to achieve stable operation and maintain stable activity performance, solve the effect of frequent switching and regeneration

Active Publication Date: 2013-01-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, the use of a fixed bed cannot remove the heat in time, resulting in catalyst deactivation, and frequent switching and regeneration of the catalyst, resulting in fluctuations in reaction conditions and unstable operation. Method for producing propylene from methanol or dimethyl ether

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  • Method for producing propylene from methanol or dimethyl ether

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Effect test

Embodiment 1

[0027] according to figure 1 In the process flow shown, the raw material methanol enters the reactor 1 from the inlet 2, and the heat generated by the reaction is taken out through the heat exchanger 3, and the partially deactivated ZSM-5 molecular sieve (SiO 2 / Al 2 o 3 The molar ratio is 50), and the catalyst is controlled by the catalyst control slide valve 5, and enters the regenerator 6 from the catalyst standby inclined pipe. In the regenerator 6, the deactivated catalyst is regenerated and activated by the air coming in from the regeneration air inlet 8, and the catalyst recovers its activity. The exhaust gas generated by regeneration is discharged from the exhaust gas outlet 8 of the regenerator. The regenerated catalyst is controlled by the catalyst control slide valve 9, and returned to the reactor 1 for recycling through the regeneration inclined pipe. The pressure in the reactor is 0.02MPa, the reaction temperature is 400°C, and the regeneration temperature is 5...

Embodiment 2

[0029] according to figure 1 In the process flow shown, the raw material dimethyl ether enters the reactor 1 from the inlet 2, and the heat generated by the reaction is taken out through the heat exchanger 3, and the partially deactivated ZSM-5 molecular sieve (SiO 2 / Al 2 o 3 The molar ratio is 150) the catalyst is controlled by the catalyst control slide valve 5, and enters the regenerator 6 from the catalyst standby inclined tube. In the regenerator 6, the deactivated catalyst is regenerated and activated by the air coming in from the regeneration air inlet 8, and the catalyst recovers its activity. The exhaust gas generated by regeneration is discharged from the exhaust gas outlet 8 of the regenerator. The regenerated catalyst is controlled by the catalyst control slide valve 9, and returned to the reactor 1 for recycling through the regeneration inclined pipe. The pressure in the reactor is 0.1MPa, the reaction temperature is 500°C, and the regeneration temperature is ...

Embodiment 3

[0031] according to figure 1 In the process flow shown, the mixture of raw material methanol and water (water / methanol=0.5) enters the reactor 1 from the inlet 2, and the heat generated by the reaction is taken out through the heat exchanger 3, and the partially deactivated ZSM-5 molecular sieve (SiO 2 / Al 2 o 3The molar ratio is 100) the catalyst is controlled by the catalyst control slide valve 5, and enters the regenerator 6 from the catalyst standby inclined tube. In the regenerator 6, the deactivated catalyst is regenerated and activated by the air coming in from the regeneration air inlet 8, and the catalyst recovers its activity. The exhaust gas generated by regeneration is discharged from the exhaust gas outlet 8 of the regenerator. The regenerated catalyst is controlled by the catalyst control slide valve 9, and returned to the reactor 1 for recycling through the regeneration inclined pipe. The pressure in the reactor is 0.05MPa, the reaction temperature is 450°C, ...

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Abstract

The invention relates to a method for producing propylene from methanol or dimethyl ether, and mainly solves the problems that a catalyst is easily inactivated due to short reaction residence time and the reaction conditions are frequently fluctuated and the operation is unstable caused by frequent switch and reproduction in the prior art. The method for producing the propylene from the methanol or the dimethyl ether comprises the following steps of: a) making oxygen-containing compounds and a diluent enter a fluid bed reactor from the bottom; b) performing contact reaction on the raw materials and a ZSM-5 molecular sieve catalyst at the temperature of between 400 and 550 DEG C under the pressure of between 0.02 and 0.5 MPa; c) separating gas-phase material flow out of the top of the fluid bed reactor to obtain the propylene; d) extracting the reaction heat by using a heat exchanger; e) controlling the inactivated catalyst with a sliding valve and feeding the catalyst into a regenerator through a catalyst spending inclined tube, reacting the inactivated catalyst with air at the temperature of between 480 and 700 DEG C to burn off carbon deposit, and exhausting waste gas; and f) controlling the regenerated catalyst by using the sliding valve and feeding the regenerated catalyst to the upper part of the fluid bed reactor for circulation through a catalyst regenerating inclined tube. The technical scheme of the invention better solves the problems, and can be applied to the industrial production of the propylene.

Description

technical field [0001] The present invention relates to a method for producing propylene from methanol or dimethyl ether. Background technique [0002] Propylene is an important basic raw material in the petrochemical industry. Driven by the rapid growth of demand for polypropylene and its derivatives, the demand for propylene will continue to grow at a relatively rapid rate in the next few years. Therefore, propylene is considered to be a product with great market potential . At present, the production methods of propylene at home and abroad all use petroleum as raw material, but my country's petroleum resources are very scarce, and the petroleum reserves and output are far from meeting the needs of the rapid development of the national economy, and the contradiction between supply and demand is very serious. Catalytic production of low-carbon olefins (MTO) and methanol conversion to propylene (MTP) technologies from methanol as raw materials are the most promising new pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C11/04C07C1/20B01J29/40
CPCY02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 任丽萍滕加伟金文清
Owner CHINA PETROLEUM & CHEM CORP
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