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

A process method and dimethyl ether technology, which are applied to the process and system field of producing low-carbon olefins from methanol or dimethyl ether, can solve the problems such as the inability to meet the rapid separation of gas and solid, and achieve short gas-solid residence time and processing capacity. Increased, equipment and particle wear is less effective

Inactive Publication Date: 2002-07-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Experimental program
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Effect test

Embodiment 1

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

Embodiment 2

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

Embodiment 3

[0033]The reaction is carried out in a gas-solid co-current down-flow 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 and water is 1:0.5, the temperature of the reactor is 650°C, the temperature of the regenerator is 780°C, and the residence time is 0.2 seconds, the ratio of agent to oil is 5, and the reaction is performed at 0.95MPa. The conversion rate of dimethyl ether is 99%. Among the hydrocarbon products, the proportion of ethylene is 62%, propylene is 24%, butene is 7%, and the yield of low carbon olefins 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 and system for producing low-carbon olefins from methanol or dimethyl ether, which belongs to the chemical process [0002] technology field. Background technique [0003] Ethylene and propylene are important basic organic chemical raw materials. The traditional process mainly uses naphtha and other light oil cracking to produce low-carbon olefins such as ethylene and propylene. However, the quality of crude oil in our country is heavy, and the supply of naphtha and gas oil is insufficient; the fluctuation of crude oil price in the international market has intensified, and the price of light oil products such as naphtha has also continued to rise, resulting in the high cost of ethylene raw materials, while raw materials in ethylene It accounts for 60-80% of the production cost, which greatly reduces the economic benefits of the production enterprise, and even causes large-scale losses of the enterprise. In recent y...

Claims

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Application Information

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Patent Type & Authority Applications(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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