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Method for producing low-carbon olefins

A low-carbon olefin and production method technology, which is applied in ethylene production, chemical instruments and methods, biological raw materials, etc., can solve the problems of raw material impurities, short operation cycle, and low yield of low-carbon olefins, etc., to achieve increased yield, The effect of good technical effects

Active Publication Date: 2019-11-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the yield of low-carbon olefins in the prior art is not high, the influence of raw material impurities is relatively large, and the operation cycle is short. A new production method for low-carbon olefins is provided.

Method used

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  • Method for producing low-carbon olefins
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  • Method for producing low-carbon olefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0025] In the fluidized bed reaction-regeneration device, crude methanol is used as a raw material, and in a fluidized bed reactor, it is contacted with a silicoaluminophosphate molecular sieve catalyst under effective conditions to generate products including low-carbon olefins. After the catalyst is deactivated Enter the fluidized bed regenerator through the inclined pipe to be produced for regeneration, and the regenerated catalyst returns to the fluidized bed reactor through the regenerated inclined pipe after degassing in the degassing tank; wherein, the purity of methanol in the crude methanol is 95% and contains Impurities, the impurities include fusel alcohols and high-carbon hydrocarbons, the mass content of the impurities is 0.1%, the total mass content of alkali metals in the crude methanol raw material is 0.5 ppm, and the total mass content of iron ions is 0.1 ppm. The crude methanol raw material enters the fluidized bed reactor after being vaporized by the flash ta...

Embodiment 5～7

[0029] According to the conditions described in Example 4, only the reactor temperature was changed, and the experimental results are shown in Table 2. The reaction-regeneration unit operated smoothly for 1.8 years.

[0030] Table 2

[0031]

Embodiment 8～10

[0033] According to the conditions described in Example 4, only the reaction pressure was changed, and the experimental results are shown in Table 3. The reaction-regeneration unit operated smoothly for 1.8 years.

[0034] table 3

[0035]

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PUM

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Abstract

The invention relates to a method for producing low-carbon olefins. The method is mainly used for solving the problems of a low-carbon olefin production process that the yield of a target product is relatively low, the influence caused by raw material impurities is relatively large, and the operation cycle is short. According to the method, crude methanol serves as a raw material and is in contactwith an aluminosilicophosphate molecular sieve catalyst in a fluidized-bed reactor under effective conditions to produce a product containing the low-carbon olefins, the catalyst is deactivated and then enters a fluidized bed regenerator for regeneration through a regeneration pipe chute, and the regenerated catalyst is degassed in a degassing tank and then returns to the fluidized-bed reactor through a regeneration pipe chute; the crude methanol has a methanol purity higher than 90% and contains impurities, the impurities comprise fusel alcohol and heavy carbon hydrocarbons, and the mass content of the impurities is lower than 2%; the method is characterized in that the crude methanol raw material is subjected to flash vaporization by a flash evaporation tank and then enters the fluidized-bed reactor, and the impurities are withdrawn from the bottom of the flash evaporation tank and then are fed into the degassing tank; through adopting the technical scheme, the above problems are better solved; and the method can be applied to industrial production of the low-carbon olefins.

Description

technical field [0001] The invention relates to a method for producing low-carbon olefins, which belongs to the technical field of preparing low-carbon olefins from coal or natural gas through synthesis gas and methanol. [0002] technical background [0003] 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 (dimet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C11/06C07C1/20
CPCC07C1/20C07C2529/83C07C11/04C07C11/06Y02P20/584Y02P30/20Y02P30/40
Inventor 齐国祯王洪涛李晓红俞志楠
Owner CHINA PETROLEUM & CHEM CORP
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