Method for catalytically converting naphtha into light olefins

A technology for catalytic conversion of low-carbon olefins, applied in catalytic cracking, petroleum industry, hydrocarbon cracking and hydrocarbon production, etc., can solve the problems of low yield of low-carbon olefins, increase yield, ensure gas-solid contact time, and improve single-pass Yield effect

Inactive Publication Date: 2011-12-28
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 in the prior art, and a new method for catalytically converting naphtha into low-carbon olefins is provided

Method used

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  • Method for catalytically converting naphtha into light olefins
  • Method for catalytically converting naphtha into light olefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] in such as figure 1 In the shown reaction-regeneration device, the catalyst is ZSM-5, and the silicon-aluminum ratio is 50 (volume). The average temperature of the regenerator is 675° C., the carbon deposition amount of the spent agent is 2.5% (weight), and the carbon deposition amount of the regenerated catalyst is 0.23% (weight). The settling stripper is located on the upper part of the regenerator, the stripping zone is built in the regenerator, and the stripping medium is water vapor. The naphtha conversion reactor is a riser and bed in series type, the lower section is a riser, and the upper section is a fast fluidized bed. The ratio of the diameter of the upper section to the diameter of the lower section is 2.0:1. The distillation range of naphtha is 25-204°C. The content of alkanes and naphthenes is 93.5% by weight, the content of olefins is less than 02% by weight, and the content of aromatics is 6.2% by weight, and water vapor is added as a diluent, and the m...

Embodiment 2～3

[0020] According to the conditions and steps described in Example 1, only the reaction temperature of the naphtha conversion reactor was changed, and the experimental results are shown in Table 1.

[0021] Table 1

[0022]

Embodiment 3～4

[0024] According to the conditions and steps described in Example 1, only the gas phase velocity of the naphtha conversion reactor was changed, and the experimental results are shown in Table 2.

[0025] Table 2

[0026]

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Abstract

The invention relates to a method for catalytically converting naphtha into low-carbon olefins, which mainly solves the problem of low yield of low-carbon olefins in the prior art. The present invention comprises the following steps by adopting a naphtha catalytic conversion method for light olefins: (a) providing a reaction device comprising a naphtha conversion reactor, a regenerator, a settling stripper, and a gas-solid cyclone Separator; (b) The main raw material of naphtha is contacted with the catalyst in the naphtha conversion reactor to generate products, and at the same time form a carbon deposition catalyst, which enters the settling stripper above the regenerator; (c) carbon deposition catalyst After entering the stripping zone, part of the carbon-deposited catalyst after stripping returns to the upper section of the naphtha conversion reactor, and a part enters the regenerator for regeneration to form a regenerated catalyst; (d) the regenerated catalyst enters the lower section of the naphtha conversion reactor; wherein, the regeneration The technical solution with a catalyst activity index greater than 0.8 better solves the above problems and can be used in the industrial production of light olefins.

Description

technical field [0001] The invention relates to a method for catalytically converting naphtha into light olefins. technical background [0002] Low-carbon olefins, namely ethylene and propylene, are two important basic chemical raw materials, and their demand is increasing. At present, the production of ethylene and propylene mainly relies on steam thermal cracking and catalytic cracking. About 90% of ethylene and 61% of propylene come from the steam pyrolysis process. The pyrolysis reaction requires high temperature and high energy consumption. Propylene is a co-product with low yield and the ratio of ethylene to propylene is limited. The raw material of my country's steam thermal cracking unit is mainly naphtha, which is too single. At present, the trend of inferior and heavy crude oil in my country is becoming more and more serious. In addition, the demand for gasoline in the domestic market is also large, so it will inevitably lead to Due to the shortage of raw material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/06C07C11/06C07C11/04C10G11/05
CPCY02P20/52Y02P20/584
Inventor 齐国祯钟思青王华文王洪涛
Owner CHINA PETROLEUM & CHEM CORP
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