Reaction unit for preparing low-carbon olefins

A low-carbon olefin and reaction device technology, which is applied in the direction of hydrocarbon cracking, hydrocarbon production from oxygen-containing organic compounds, ethylene production, etc., can solve the problem of low yield of low-carbon olefins, achieve high selectivity and increase yield , improve the effect of selectivity

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

[0007] The technical problem to be solved by the present invention is the low yield of low-carbon olefins ex

Method used

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  • Reaction unit for preparing low-carbon olefins

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] [Example 1]

[0021] In such figure 1 In the reaction device shown, the methanol feedstock enters the fast fluidized bed reaction zone 2 and contacts with the SAPO-34 catalyst. The resulting gaseous stream and catalyst enter the coarse cyclone 4, and the gaseous stream enters the dense phase settler 21 through the coarse cyclone gas phase outlet 5 In the second stage, the catalyst enters the gas-solid distribution zone 7 through the coarse spinning leg 6. The catalyst in the gas-solid distribution zone 7 is divided into at least two parts. 20% of the catalyst enters the down-bed reaction zone 9, and contacts with the methanol feedstock. In the fast bed reaction zone 2, 80% enters the regenerator 11 for regeneration to form a regenerated catalyst. The regenerated catalyst is divided into at least two parts, 20% is returned to the down-bed reaction zone 9, 80% enters the riser reaction zone 20, and contacts with hydrocarbons above C4. The generated gaseous stream and cataly...

Example Embodiment

[0022] [Example 2]

[0023] According to the conditions and steps described in Example 1, the catalyst in the gas-solid distribution zone 7 is divided into at least two parts. 75% of the catalyst enters the down-bed reaction zone 9, and 25% enters the regenerator 11 for regeneration to form a regenerated catalyst. The regenerated catalyst is at least Divided into two parts, 60% returns to the descending bed reaction zone 9, 40% enters the riser reaction zone 20, the C4 olefin mass content in the hydrocarbon stream above C4 is 75%, and the reaction conditions of the riser reaction zone 20 are: the reaction temperature is 600 ℃, the reaction pressure is 0.01MPa in gauge pressure, and the gas linear velocity is 12 m / s; the reaction conditions of the down-bed reaction zone 9 are: the reaction temperature is 460℃, the reaction pressure is 0.01 MPa in gauge pressure, and the gas linear velocity is 10 m / s; the reaction conditions of the fast bed reaction zone 2 are: the reaction tempera...

Example Embodiment

[0024] [Example 3]

[0025] According to the conditions and steps described in Example 1, the catalyst in the gas-solid distribution zone 7 is divided into at least two parts, 50% enters the down-bed reaction zone 9, and 50% enters the regenerator 11 for regeneration to form a regenerated catalyst. The regenerated catalyst is at least Divided into two parts, 50% returns to the descending bed reaction zone 9, 50% enters the riser reaction zone 20, the mass content of C4 olefins in the hydrocarbon stream above C4 is 92%, and the reaction conditions of the riser reaction zone 20 are: the reaction temperature is 560 ℃, the reaction pressure is 0.01MPa in gauge pressure, and the gas linear velocity is 7 m / s; the reaction conditions of the down-bed reaction zone 9 are: the reaction temperature is 440℃, the reaction pressure is 0.01 MPa in gauge pressure, and the gas linear velocity is 6.6 m / s; the reaction conditions of the fast bed reaction zone 2 are: the reaction temperature is 450°...

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Abstract

The invention relates to a reaction unit for preparing low-carbon olefins, mainly solving the problem of low yield of low-carbon olefins in the prior art. The reaction unit mainly comprises a rapid fluidized bed reaction zone 2, a rough-cut cyclone 4, a disengager 21, a gas-solid distribution zone 7, a downer reaction zone 9, a regenerator 11, and a riser reaction zone 20, wherein the outlet of the riser reaction zone 20 is connected with the disengager 21, the bottom of the disengager is connected with the regenerator 11 through a regeneration standpipe 26, the regenerator 11 is provided with two catalyst outlets, one catalyst outlet is connected with the riser reaction zone 20, the other catalyst outlet is connected with the downer reaction zone 9, the outlet of the downer reaction zone 9 is connected with the rapid fluidized bed reaction zone 2, the outlet of the rapid fluidized bed reaction zone 2 is connected with the rough-cut cyclone 4, a gas-phase outlet pipeline 5 of the rough-cut cyclone 4 is connected with the disengager 21, the dipleg of the rough-cut cyclone 4 is connected with the gas-solid distribution zone 7, and the gas-solid distribution zone 7 is connected with the downer reaction zone 9. The reaction unit disclosed herein well solves the problems and can be used in the industrial production of low-carbon olefins.

Description

technical field [0001] The invention relates to a reaction device for producing light olefins from methanol. 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 low-carbon olefins is oxygenated compounds, 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, biomas...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C11/06C07C1/20C07C4/06
CPCY02P20/584Y02P30/20Y02P30/40
Inventor 齐国祯李晓红王华文
Owner CHINA PETROLEUM & CHEM CORP
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