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Catalytic cracking method

A catalytic cracking and catalyst technology, applied in catalytic cracking, cracking, multi-stage parallel cracking process treatment, etc., can solve the problems of high dry gas yield and low conversion rate of heavy oil, etc. The effect of improving the conversion depth of heavy oil and maintaining the yield of propylene

Active Publication Date: 2011-05-25
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a high yield of dry gas and a low conversion rate of heavy oil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The experiment was carried out in a medium-sized device. The raw material was a mixture of olefin-rich cracked light gasoline C and cracked heavy oil A (according to the ratio of C:A=1:1.5), and the catalyst was MMC-2. The internal diameter of the riser in the medium-sized device for continuous reaction-regeneration operation is 16 mm and the height is 3200 mm. The outlet of the riser is connected to the fluidized bed reactor. The internal diameter of the fluidized bed reactor is 64 mm and the height is 600 mm. All the feed enters the device from the nozzle at the bottom of the riser to participate in the reaction.

[0037]The test adopts a single-pass operation mode. The high-temperature regenerated catalyst enters the bottom of the reaction section of the riser from the regenerator through the regenerated inclined pipe, and flows upward under the action of the steam pre-lift medium. After the raw oil is preheated and mixed with atomized water vapor, it enters the ris...

Embodiment 2

[0044] Experiments were carried out on the mesoscale device described in Example 1. The injection ratio of olefin-rich pyrolysis light gasoline C and pyrolysis heavy oil A is 1:1, wherein raw material C is injected into the riser from the raw material nozzle at the bottom of the riser, and raw material A is injected into the riser from the raw material nozzle at 1 / 2 the length of the riser to participate in reaction. The main operating conditions and results of the experiments are listed in Table 4.

Embodiment 3

[0046] The tests were carried out on the mesoscale plant described in Example 1. The injection ratio of olefin-rich pyrolysis light gasoline C and pyrolysis heavy oil A is 1:1.2, wherein raw material C is injected into the riser from the raw material nozzle at the bottom of the riser, and raw material A is injected into the riser from the raw material nozzle at the bottom of the fluidized bed to participate in the reaction. The main operating conditions and results of the experiments are listed in Table 4.

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Abstract

The invention relates to a catalytic cracking method which comprises the following steps of: enabling heavy raw materials to be in contact with a catalyst containing shape selective zeolite with average hole diameter of less than 0.7nm in a first raising pipe reactor for performing cracking reaction, and enabling light raw materials and cracked heavy oil to be in contact with the catalyst containing the shape selective zeolite with the average hole diameter of less than 0.7nm in a second raising pipe reactor and a fluidized bed reactor for performing the cracking reaction. The method is used for catalytic cracking of the heavy oil, the conversion rate of the heavy oil and the yield of propylene are high, and the yield of dry gas and coke is low.

Description

technical field [0001] The invention relates to a catalytic cracking method. Background technique [0002] Catalytic cracking of heavy oil is an important method to prepare small molecular olefins such as ethylene, propylene and butene. The method of catalytic cracking of heavy oil used in industry to produce low-carbon olefins includes the catalytic cracking technology (DCC , USP4980053 and USP5670037) and the catalytic pyrolysis technology (CPP, USP6210562) of the largest production of ethylene, the method adopts a single riser reactor or a single riser reactor combined dense phase fluidized bed reactor structure to react, but dry Gas and coke yields are high. [0003] In recent years, the technology of producing propylene with two riser reactors has received a lot of attention. For example, CN101074392A discloses a method for producing propylene and high-quality gasoline and diesel oil by two-stage catalytic cracking, using a two-stage riser, using catalysts rich in sha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G51/00
CPCC10G2300/1014C10G2300/708C10G2300/301C10G2300/104C10G2300/4018C10G51/06C10G51/026C10G2300/1018C10G2300/4093C10G11/18C10G11/20C10G2400/20C10G51/00C10G2400/02
Inventor 谢朝钢高永灿鲁维民龙军崔琰张久顺杨轶男马建国李正姜楠
Owner CHINA PETROLEUM & CHEM CORP
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