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Catalytic conversion method and catalytic conversion device for producing low-carbon olefins

A catalytic conversion method and technology of low-carbon olefins, which is applied in the field of catalytic conversion devices and the production of low-carbon olefins, can solve the problems of low ethylene and propylene yields of light hydrocarbon raw materials, and limited precise control of the reaction zone, and achieve improved Effects of selectivity, increased yield, and high depth of conversion

Pending Publication Date: 2021-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above technologies promote the production of heavy hydrocarbon raw materials by adjusting the catalyst formulation, setting different reaction zones and adopting the combination reactor form of riser and fluidized bed. Convert or improve the selectivity of light olefins, but the precise control of different reaction zones is limited, and the ethylene and propylene yields of light hydrocarbon feedstocks are low

Method used

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  • Catalytic conversion method and catalytic conversion device for producing low-carbon olefins
  • Catalytic conversion method and catalytic conversion device for producing low-carbon olefins
  • Catalytic conversion method and catalytic conversion device for producing low-carbon olefins

Examples

Experimental program
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Effect test

Embodiment 1

[0133] test in figure 1 It was carried out on the medium-scale test rig shown. The device includes three reactors, namely a riser reactor, a descending reactor and a fluidized bed reactor, wherein the riser reactor has an inner diameter of 16mm and a length of 3200mm, and the descending riser reactor has an inner diameter of 15mm. The length is 2500mm, the inner diameter of the fluidized bed reactor is 80mm, and the length is 500mm.

[0134] The heavy raw material is introduced into the bottom of the riser reactor, and reacts with the regenerated catalyst from the regenerator and the carbon-deposited catalyst in the down-flow reactor. The reacted oil mixture is introduced into the fluidized bed reactor to continue the reaction. The reacted oil The mixture is separated by a cyclone.

[0135] The light raw material is introduced into the top of the down-flow reactor, the regenerated catalyst CAT from the regenerator is contacted and reacted, and the resulting oil mixture is se...

Embodiment 2

[0139] According to the method of embodiment 1, the difference is that the catalyzer at the bottom of the down-flow reactor is not introduced into the bottom of the riser reactor and the stripper, but the catalyzer at the bottom of the down-flow reactor is introduced into the fluidized bed reactor and the stripper device. The weight ratio of the coke catalyst introduced into the fluidized bed reactor and the stripper is 0.5:1, and the weight ratio of light feedstock to heavy feedstock is 0.2:1. The reaction conditions and results are shown in Table 3.

Embodiment 3

[0141]According to the method of Example 1, the difference is that in addition to introducing the catalyst at the bottom of the down-flow reactor into the riser reactor and the stripper, the catalyst at the bottom of the down-flow reactor is also introduced into the fluidized bed reactor. The weight ratio of the coke catalyst introduced into the riser reactor, the fluidized bed reactor and the stripper is 0.3:0.2:1, and the weight ratio of the light feedstock to the heavy feedstock is 0.2:1. The reaction conditions and results are shown in Table 3.

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Abstract

The invention provides a catalytic conversion method and a catalytic conversion device for producing low-carbon olefins. The method comprises the following steps: carrying out contact reaction on a heavy raw material and a cracking catalyst in a riser reactor to obtain a first oil agent mixture; enabling the first oil agent mixture to enter a fluidized bed reactor for reaction; and carrying out a contact reaction on the light raw material and a cracking catalyst in a down reactor to obtain a second oil agent mixture. According to the catalytic conversion method and device thereof, the light raw material is introduced into the downstream reactor, and the conversion rate of the light raw material and the selectivity of low-carbon olefin can be improved under the conditions of high temperature, short contact time and large catalyst-oil ratio, so that the yields of ethylene and propylene are further improved.

Description

technical field [0001] The invention relates to the field of petroleum processing, in particular to a catalytic conversion method and a catalytic conversion device for producing light olefins. Background technique [0002] In recent years, with the continuous development of the chemical industry, the demand for low-carbon olefins such as ethylene and propylene has shown a rapid growth trend, and there is a large gap in the low-carbon olefins market. At present, the methods for producing low-carbon olefins mainly include steam cracking technology, catalytic cracking technology, propane dehydrogenation to propylene technology, and coal-to-methanol to olefins technology. Among them, steam cracking technology is the main source of low-carbon olefins. The ethylene produced by it accounts for more than 95% of the total ethylene output, propylene accounts for about 61% of the total propylene output, and the propylene produced by catalytic cracking technology accounts for about 34% ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G51/00C10G3/00C07C4/06C07C11/04C07C11/06
CPCC10G51/00C10G3/44C10G3/49C07C4/06C10G2300/107C10G2300/1077C10G2300/1074C10G2300/1037C10G2300/1011C10G2300/4093C10G2300/70C10G2400/20C07C11/04C07C11/06Y02P20/52Y02P20/584
Inventor 朱根权马文明杨超
Owner CHINA PETROLEUM & CHEM CORP
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