Method for producing low-carbon olefins from methanol and naphtha

A technology for low-carbon olefins and naphtha, which is applied in the petroleum industry, bulk chemical production, hydrocarbon cracking to produce hydrocarbons, etc., can solve the problem of low yield of low-carbon olefins, etc. The effect of low material temperature

Active Publication Date: 2013-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is the low yield of low-carbon olefins in the prior art, and a new method for producing low-carbon olefins from methanol and naphtha is provided

Method used

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  • Method for producing low-carbon olefins from methanol and naphtha

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] in such as figure 1 In the shown reaction device, the catalyst is ZSM-5, SiO 2 / Al 2 o 3The molar ratio is 10, naphtha and water vapor enter the first reaction zone with a weight ratio of 1.5:1, contact with the catalyst, and the gas phase stream and catalyst that are generated are mainly methanol After the raw material is contacted, it enters the second reaction zone to generate a product stream including low-carbon olefins, and simultaneously forms a raw catalyst. The raw catalyst is divided into two parts, 40% of the weight enters the regenerator for regeneration, and 60% of the weight returns through the external circulation inclined pipe In the second reaction zone, the regenerated catalyst formed in the regenerator returns to the first reaction zone. Wherein, the methanol entering through the distribution pipe is in countercurrent contact with the gas phase flow formed in the first reaction zone, and the feed temperature of the methanol raw material is 200°C. ...

Embodiment 2

[0023] According to the conditions and steps described in Example 1, the catalyst is ZSM-5, SiO 2 / Al 2 o 3 The molar ratio is 100, naphtha and water vapor enter the first reaction zone with a weight ratio of 0.05:1, contact with the catalyst, and the gas phase stream and the catalyst that enter from the distribution pipe at the outlet end of the first reaction zone are mainly methanol After the raw materials are contacted, they enter the second reaction zone to generate a product stream including low-carbon olefins, and simultaneously form a raw catalyst. The raw catalyst is divided into two parts, 80% of the weight enters the regenerator for regeneration, and 20% of the weight returns through the external circulation inclined pipe In the second reaction zone, the regenerated catalyst formed in the regenerator returns to the first reaction zone. Wherein, the methanol entering through the distribution pipe is in countercurrent contact with the gas phase stream formed in the ...

Embodiment 3

[0025] According to the conditions and steps described in Example 1, the catalyst is ZSM-5, SiO 2 / Al 2 o 3 The molar ratio is 70, naphtha and water vapor enter the first reaction zone with a weight ratio of 0.5:1, and the unborn catalyst is divided into two parts, 50% of the weight enters the regenerator for regeneration, and 50% of the weight returns to the first reaction zone through the external circulation inclined pipe. In the second reaction zone, the feed temperature of methanol raw material is 100°C. The carbon deposition mass fraction of the regenerated catalyst is 0.1%, and the reaction conditions in the first reaction zone are: the reaction temperature is 650° C., the reaction pressure is 0.01 MPa in terms of gauge pressure, and the gas phase velocity is 0.6 m / s; The reaction conditions are as follows: the reaction temperature is 617° C., the reaction pressure is 0.01 MPa in terms of gauge pressure, the gas phase velocity is 1.5 m / s, and the feed weight ratio of ...

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Abstract

The invention relates to a method for producing low-carbon olefins from methanol and naphtha to mainly solve a low low-carbon olefin yield problem in previous technologies. The method mainly comprises the following steps: 1, allowing a naphtha-containing raw material to enter a first reaction zone and contact with a molecular sieve catalyst, allowing a generated gas phase material flow and a catalyst to contact with a raw material which mainly comprises methanol and enters from the distribution tube positioned at the outlet end of the first reaction zone, and then allowing the gas phase material flow to enter a second reaction zone to generate a product material flow comprising the low-carbon olefins and simultaneously form a catalyst to be regenerated; 2, dividing the catalyst to be regenerated into at least two parts, allowing one part of the catalyst to be regenerated to enter a regenerator for regeneration to form a regenerated catalyst, and allowing the other part of the catalyst to be regenerated to go through an outer circuiting incline tube and then return to the second reaction zone; and 3, returning the regenerated catalyst to the first reaction zone, wherein the methanol entering the from the distribution tube contacts with the gas phase material flow formed in the first reaction zone in a countercurrent manner, and the feed temperature of the raw material mainly comprising methanol is 40-200DEG C. The above technical scheme well solves the problem, and the method can be used for the industrial production of the low-carbon olefins.

Description

technical field [0001] The invention relates to a method for producing light olefins from methanol and naphtha. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C4/06C10G11/00C07C11/02
CPCY02P20/52Y02P20/584
Inventor 齐国祯钟思青王华文陈伟
Owner CHINA PETROLEUM & CHEM CORP
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