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Method for producing low carbon olefin from methanol or dimethyl ether

A low-carbon olefin and dimethyl ether technology, which is applied in ethylene production, bulk chemical production, biological raw materials, etc., can solve problems such as low low-carbon olefin yield, improve the low-carbon olefin yield, and reduce gas-solid return. Mixing and improving the effect of selectivity

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 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 or dimethyl ether is provided

Method used

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  • Method for producing low carbon olefin from methanol or dimethyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2

[0018] In such figure 1 In the reaction device shown, the catalyst type is shown in Table 1. At normal pressure, the feed is methanol, which enters the first reaction zone and the second reaction zone respectively. The baffle is installed vertically, and the baffle is arc-shaped, and the bottom of the baffle is connected to the reaction zone. The bottom is connected, the height of the baffle is 1 / 2 of the height of the reaction zone, the volume ratio of the first reaction zone to the second reaction zone is 0.6:1, and the ratio of the mass flow of methanol entering the first reaction zone to the second reaction zone is 0.5:1, the spent catalyst is divided into three parts, 15% returns to the first reaction zone, 55% returns to the second reaction zone, and 30% goes to the regenerator for regeneration. The conditions of the first reaction zone are: the reaction temperature is 459℃, The gas-phase linear velocity is 1.36 m / s, the second reaction zone conditions are that the reacti...

Embodiment 3

[0022] According to the conditions and steps described in Example 2, the baffle is a straight plate, the bottom of the baffle is connected to the bottom of the reaction zone, the height of the baffle is 1 / 4 of the height of the reaction zone, and the volume ratio of the first reaction zone to the second reaction zone The ratio of methanol mass flow entering the first reaction zone to the second reaction zone is 0.3:1. The spent catalyst is divided into three parts, 30% is returned to the first reaction zone, and 35% is returned to the second reaction zone. In the reaction zone, 35% goes to the regenerator for regeneration. The conditions of the first reaction zone are: the reaction temperature is 425℃, the gas linear velocity is 1.96 m / s, and the second reaction zone conditions are the reaction temperature of 402℃, the gas linear velocity is 1.02 m / Sec, the average carbon deposit mass fraction of the catalyst in the third reaction zone is 2.5%, and the average carbon deposit ma...

Embodiment 4

[0024] According to the conditions and steps described in Example 2, the raw material is dimethyl ether, the baffle is a straight plate, and the bottom of the baffle is connected to the bottom of the reaction zone. The height of the baffle is 3 / 4 of the height of the reaction zone. The volume ratio of the two reaction zones is 0.8:1, the mass flow ratio of dimethyl ether entering the first reaction zone and the second reaction zone is 1.0:1, the spent catalyst is divided into three parts, and 30% is returned to the first reaction Zone, 55% is returned to the second reaction zone, 15% goes to the regenerator to regenerate, the conditions of the first reaction zone are: the reaction temperature is 450℃, the gas linear velocity is 1.0 m / s, and the second reaction zone conditions are the reaction temperature is 475 ℃, the gas linear velocity is 2.97 m / s, the average carbon deposition mass fraction of the third reaction zone catalyst is 5.0%, the average carbon deposition mass fracti...

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Abstract

The invention relates to a method for producing low carbon olefin from methanol or dimethyl ether. The problem that the yield of the low carbon olefin is low in the prior art is solved. The method comprises the following steps that: (a) a reaction area with a baffle plate is provided, wherein the bottom of the baffle plate is connected with that of the reaction area, the height of the baffle plate is 1 / 4 to 3 / 4 that of the reaction area, and the baffle plate divides the reaction area into a first reaction area, a second reaction area and a third reaction area; (b) a raw material, which comprises at least one of the methanol or the dimethyl ether, enters the first reaction area and the second reaction area respectively to be in contact with a catalyst to generate a gas-phase material flow, and the generated gas-phase material flow and the catalyst enter the third reaction area together to generate a product and form a spent catalyst at the same time; (c) the spent catalyst is at least divided into three parts, wherein the first part is returned to the first reaction area, the second part is returned to the second reaction area, and the third part is returned to a regenerator for regeneration; and (d) the spent catalyst subjected to regeneration is returned to the first reaction area. The problem is better solved through the technical scheme and the method can be applied to the industrial production of the low carbon olefin.

Description

Technical field [0001] The invention relates to a method for producing low-carbon olefins from methanol or dimethyl ether. technical background [0002] Low-carbon olefins, namely ethylene and propylene, are two important basic chemical raw materials, and their demand is constantly increasing. Generally, ethylene and propylene are produced through petroleum routes. However, due to the limited supply of petroleum resources and higher prices, the cost of producing ethylene and propylene from petroleum resources is increasing. In recent years, people have begun to vigorously develop technologies for the conversion of alternative raw materials to ethylene and propylene. Among them, an important type of alternative raw materials for the production of light olefins are oxygenated compounds, such as alcohols (methanol, ethanol), ethers (dimethyl ether, methyl ethyl ether), esters (dimethyl carbonate, methyl formate). These oxygen-containing compounds can be converted from energy such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C11/04C07C11/06
CPCY02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 齐国祯俞志楠金永明
Owner CHINA PETROLEUM & CHEM CORP