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Process and system for preparing low-carbon olefin from methanol or dimethylether

A process method and technology of low-carbon olefins, applied in the direction of hydrocarbon production from oxygen-containing organic compounds, chemical recovery, organic chemistry, etc., can solve the problems that cannot meet the rapid separation of gas and solid, and achieve short gas-solid residence time, equipment and particle The effect of less wear and lower difficulty

Inactive Publication Date: 2004-07-07
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The particle residence time of the commonly used cyclone separator is about 0.5 seconds, which obviously cannot meet the needs of rapid gas-solid separation

Method used

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  • Process and system for preparing low-carbon olefin from methanol or dimethylether
  • Process and system for preparing low-carbon olefin from methanol or dimethylether

Examples

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Embodiment 1

[0029] The reaction is carried out in a gas-solid co-current downward circulating fluidized bed reactor. The feed is dimethyl ether, the feed is in liquid phase, the catalyst is SAPO34, the reactor temperature is 460°C, the regenerator temperature is 510°C, the residence time is 10 seconds, the catalyst-to-oil ratio is 30, and the reaction is performed at 0.01 MPa. The conversion rate of dimethyl ether is 99%. In the hydrocarbon products, ethylene accounts for 60%, propylene accounts for 25%, butene accounts for 8%, and the yield of low-carbon olefins is 93. %.

Embodiment 2

[0031] The reaction is carried out in a gas-solid co-current downward circulating fluidized bed reactor. The feed is dimethyl ether, gas phase feed, SAPO34 is used as the catalyst, the reactor temperature is 530°C, the regenerator temperature is 650°C, the residence time is 5 seconds, the catalyst-to-oil ratio is 18, and the reaction is carried out under normal pressure. The conversion rate of dimethyl ether is 99%. In the hydrocarbon products, ethylene accounts for 63%, propylene accounts for 24%, butene accounts for 7%, and the yield of low-carbon olefins is 95%. %.

Embodiment 3

[0033]The reaction is carried out in a gas-solid co-current downward circulating fluidized bed reactor. The feed is a mixture of dimethyl ether and water, gas phase feed, the catalyst is SAPO34, the molar ratio of dimethyl ether to water is 1:0.5, the reactor temperature is 650℃, the regenerator temperature is 780℃, and the residence time is 0.2 Second, the agent-oil ratio is 5, and the reaction is conducted at 0.95MPa. The conversion rate of dimethyl ether is 99%. In the hydrocarbon products, the proportion of ethylene is 62%, propylene is 24%, butene is 7%, and the yield of the product low-carbon olefin is 94%.

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Abstract

A process for preparing low-carbon olefin from methanol or dimethyl ether includes loading its raw material and silicon aluminium phosphate (SAPO34) molecular sieve as catalyst into gas-solid parallel down-flowing fluidized bed reactor, super-short contact, reaction, fast gas-solid separation to separating resultant from catalyst to prevent secondary reaction, and regerating catalyst for cyclic use. Its advantages include high output rate (93%), high conversion rate of raw material, and less by-product.

Description

Technical field [0001] The invention relates to a process method and system for producing low-carbon olefins from methanol or dimethyl ether, belonging to a chemical process [0002] Technical field. Background technique [0003] Ethylene and propylene are important basic organic chemical raw materials. The traditional process mainly adopts the cracking of light oil such as naphtha to produce low-carbon olefins such as ethylene and propylene. However, my country’s crude oil quality is too heavy, and the supply of naphtha and gas oil is insufficient. Crude oil prices in the international market have intensified, and the prices of naphtha and other light oil products have also continued to rise, resulting in excessively high raw material costs for ethylene. The production cost accounts for 60 to 80%, which greatly reduces the economic benefits of the production enterprise, and even causes a large-scale loss of the enterprise. In recent years, the production of low-carbon olefins fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C11/02
CPCY02P20/584
Inventor 魏飞高雷罗国华金涌
Owner TSINGHUA UNIV
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