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Method for producing propylene

A technology of propylene and ethylene, which is applied in ethylene production, bulk chemical production, biological raw materials, etc., and can solve the problem of low propylene yield

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

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is the problem of low propylene yield in the prior art, and a new method for producing propylene is provided

Method used

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  • Method for producing propylene
  • Method for producing propylene

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Embodiment 1

[0021] In the methanol-to-olefins reaction system, the reactor is a fast fluidized bed, the regenerator is a turbulent fluidized bed, the catalyst is SAPO-34, and 99.9% (by weight) of methanol feedstock contacts with the catalyst to produce ethylene, propylene, carbon For the product of more than four hydrocarbons, the deactivated catalyst enters the regenerator for regeneration and is recycled. Reaction temperature is 460 ℃, and reaction pressure is 0.15MPa in gauge pressure, and the ratio of molecular sieve in catalyzer is 35% (weight), and methanol weight hourly space velocity is 9.0 hours -1 , the product distribution is shown in Table 1.

Embodiment 2

[0023] According to the conditions described in Example 1, the reaction temperature is 500°C, the reaction pressure is normal pressure in terms of gauge pressure, the ratio of molecular sieve in the catalyst is 30% (by weight), and the weight hourly space velocity of methanol is 12.0 hours -1 , the product distribution is shown in Table 1.

Embodiment 3

[0025] According to the conditions described in Example 1, the reaction temperature is 400° C., the reaction pressure is 0.3 MPa in gauge pressure, the ratio of molecular sieve in the catalyst is 50% (by weight), and the weight hourly space velocity of methanol is 8.0 hours -1 , the product distribution is shown in Table 1.

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Abstract

The invention relates to a method for producing propylene, which mainly solves a problem of a low propylene yield in prior art. According to the invention, the method which can improve the propylene yield comprises the following steps: (a), raw materials containing methanol are converted to a product stream containing ethylene, propylene, C4 olefin in an effective condition in a methanol to olefin (MTO) reaction system, ethylene, propylene, mixed C4 and above hydrocarbons and other byproducts are obtained through a separation system, and the byproducts return to the MTO reaction system; (b), the mixed C4 and above hydrocarbons enter a catalytic cracking system, a product stream with carbon number of less than 4 and a new mixed C4 and above hydrocarbon product stream are obtained by separating reaction products; (c), the product stream with carbon number of less than 4 returns to the separation system, the new mixed C4 and above hydrocarbon product stream and at least a portion of ethylene enter to an olefin disproportionation system to obtain a product containing propylene; and (d), residual ethylene returns to the MTO reaction system. The problem is solved better, and the method can be used for the industrial production of low carbon olefins.

Description

technical field [0001] The present invention relates to a process for the production of propylene. technical background [0002] Low-carbon olefins, namely ethylene and propylene, are two important basic chemical raw materials, and their demand is increasing. Generally, ethylene and propylene are produced through petroleum routes, but due to the limited supply and high price of petroleum resources, the cost of producing ethylene and propylene from petroleum resources continues to increase. In recent years, people have begun to vigorously develop the technology of converting alternative raw materials into ethylene and propylene. Among them, an important class of alternative raw materials for the production of light olefins are oxygenates, such as alcohols (methanol, ethanol), ethers (dimethyl ether, methyl ethyl ether), esters (dimethyl carbonate, methyl formate Esters), etc., these oxygenated compounds can be converted from coal, natural gas, biomass and other energy sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C4/06C07C6/04C07C1/20C07C11/04
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 齐国祯钟思青张惠明忻晓琦
Owner CHINA PETROLEUM & CHEM CORP