Catalytic cracking method for reducing yields of dry gas and coke

A technology for catalytic cracking and coke yield, which is used in catalytic cracking, cracking, multi-stage series refining and cracking process treatment, etc., and can solve the problems of producing a large amount of coke and dry gas.

Active Publication Date: 2019-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem in the prior art that a large amount of coke and dry gas are repeatedly produced when light hydrocarbons contact with the catalyst during the recycling process of the catalyst between the regenerator and the reactor.

Method used

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  • Catalytic cracking method for reducing yields of dry gas and coke
  • Catalytic cracking method for reducing yields of dry gas and coke
  • Catalytic cracking method for reducing yields of dry gas and coke

Examples

Experimental program
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Effect test

Embodiment 1

[0115] Example 1 illustrates the effect of the method provided by the present disclosure in reducing the yield of dry gas and coke in the catalytic cracking process of hydrocarbon oil.

[0116] Experiments were carried out with a medium-sized plant for continuous reaction-regeneration operation with three reactors, the first reactor being a riser, the riser reactor having an inner diameter of 16 mm and a height of 3800 mm. The second reactor was a riser reactor with an inner diameter of 16 mm and a height of 3200 mm. The outlet of the second riser reactor is introduced into the fluidized bed reactor as the third reactor, and the inner diameter of the fluidized bed reactor is 64 mm and the height is 300 mm.

[0117] The first catalytic cracking catalyst is the first regenerated catalyst with a temperature of 680°C. It enters the bottom of the riser reactor of the first reactor through the inclined tube of the first catalytic cracking catalyst, and flows upward under the action ...

Embodiment 2

[0127] Example 2 illustrates the effectiveness of the method provided by the present disclosure in reducing dry gas and coke yields in a hydrocarbon oil catalytic cracking process.

[0128] The reaction apparatus that adopts is with embodiment 1. The raw materials and main experimental steps are the same as in Example 1, except that the selected light hydrocarbons have a distillation range of 9 to 205°C. The weight ratio of light hydrocarbons to heavy hydrocarbon oil feedstock is 0.25:1. The main operating conditions and results are listed in Table 3. In the anaerobic fluidization zone of the regenerator, a part of fluidization gas is introduced (ordinary nitrogen is used in the laboratory, and its nitrogen content is ≥ 99.5% by volume and oxygen content is ≤ 0.5% by volume under standard conditions).

Embodiment 3

[0134] The examples illustrate the effect of the method provided by the invention in reducing the yield of dry gas and coke in the catalytic cracking process of hydrocarbon oil.

[0135] The reaction apparatus that adopts is with embodiment 1. The raw materials and main experimental steps are the same as in Example 1, except that the selected light hydrocarbons have a distillation range of 145 to 235°C. The weight ratio of light hydrocarbons and heavy hydrocarbon oil raw materials is 0.2:1 respectively. The main operating conditions and results are listed in Table 3. In the anaerobic fluidization zone of the regenerator, a part of fluidization gas is introduced (ordinary nitrogen is used in the laboratory, and its nitrogen content is ≥99.9% by volume and oxygen content is ≤0.1% by volume under standard conditions).

[0136] Table 1

[0137] Catalyst name

MMC-2

Chemical properties, wt%

al 2 o 3

54.6

P 2 o 5

2.31

RE ...

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Abstract

The present invention relates to a catalytic cracking method for reducing the yields of dry gas and coke. The method comprises: carrying out a first catalytic reaction on a heavy hydrocarbon oil raw material in a first reactor to obtain a first carbon deposition catalyst and a first product; carrying out a second catalytic reaction on a light hydrocarbon in a second reactor to obtain a second carbon deposition catalyst and a second product; introducing the steam-stripped second carbon deposition catalyst and the first part of the steam-stripped first carbon deposition catalyst into the oxygen-containing fluidization zone of a regenerator, and carrying out aerobic regeneration; and introducing the second part of the steam-stripped first carbon deposition catalyst into the oxygen-free fluidization zone of the regenerator, and carrying out oxygen-free regeneration at a temperature of 600-800 DEG C. According to the present invention, the key problem that the polycyclic aromatic hydrocarbons in the carbon deposit participate in the hydrogen transfer reaction and hinder the cracking reaction of the light hydrocarbons when the carbon deposition catalyst directly reacts with the light hydrocarbon oil in the prior art can be overcome, the high yield of low-carbon olefins in the catalytic conversion of heavy hydrocarbon oil can be achieved, and the yields of dry gas and coke are low.

Description

technical field [0001] The present disclosure relates to a catalytic cracking process with reduced dry gas and coke yields. Background technique [0002] Modern petroleum processing technology pays more attention to reducing energy consumption per unit of raw material processing and reducing carbon emissions while pursuing the yield of high-value products (such as ethylene, propylene, and C8 aromatics). Hydrogen, methane, and coke, which are by-products of petroleum hydrocarbon processing in modern refineries, are often disposed of through combustion, which is the main source of carbon emissions in refineries, which greatly reduces the economics of atomic processing. [0003] Patent CN102071054A discloses a catalytic cracking method, which includes contacting the heavy feedstock with a catalyst containing a type-selective zeolite with an average pore size less than 0.7nm in the first riser reactor for cracking reaction, and the light feedstock and cracked heavy oil in the se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G55/06C10G11/02C10G11/18
Inventor 朱金泉高永灿崔琰杨轶男谢朝钢
Owner CHINA PETROLEUM & CHEM CORP
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