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Down pipe type catalytic cracking method and apparatus

A tubular catalytic and catalytic cracking technology, which is applied in catalytic cracking, cracking, petroleum industry, etc., can solve the problems of catalytic reaction degree reduction, catalyst and oil gas back-mixing, oil gas and catalyst back-mixing, etc., and achieve the improvement of catalytic reaction degree, The effect of improving catalyst activity and increasing the ratio of catalyst to oil

Inactive Publication Date: 2007-04-11
SINOPEC LUOYANG PETROCHEM ENG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: the existing catalyst in the riser reactor is seriously mixed with oil and gas, and the degree of catalytic reaction in the second half of the reactor in the existing down tube reactor technology is reduced. Problems, as well as the existing gas-solid co-current downlink and uplink coupled catalytic cracking technology, the oil gas and catalyst in the uplink reaction section have severe back-mixing, catalyst activity is low, and the device is more difficult to operate due to the steering problem of catalyst and oil gas question

Method used

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  • Down pipe type catalytic cracking method and apparatus

Examples

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Effect test

Embodiment 1

[0050] This example illustrates the results of catalytic cracking using Daqing atmospheric residue as raw material. The distance from the catalyst inlet of the second reaction section (that is, the catalyst inlet in the middle of the downcomer reactor) to the feed oil inlet at the top of the downcomer reactor is 50% of the total length of the actual reaction section of the downcomer reactor.

[0051] The operating conditions adopted in this embodiment are: the regeneration temperature of the first regenerator is 700°C, the carbon content of the regenerated semi-regenerated catalyst is 0.25w%, and the semi-regenerated catalyst enters the first reaction section from the catalyst inlet at the top of the downward tubular reactor. The temperature of the regenerated catalyst was 700°C. The regeneration temperature of the second regenerator is 500°C, the carbon content of the regenerated catalyst is 0.05w%, and the temperature of the regenerated catalyst entering the second reaction ...

Embodiment 2

[0055] In Example 2, Daqing atmospheric residual oil is still used as the raw material, except that the distance from the catalyst inlet of the second reaction section of the downward tubular reactor to the feedstock oil inlet at the top of the downward tubular reactor is the total length of the actual reaction section of the downward tubular reactor. 40%. The residence time of oil and gas in the first reaction section is 0.8 seconds, and the residence time in the second reaction section is 1.6 seconds; the agent-oil ratio of the first reaction section is 6.6, and the agent-oil ratio of the second reaction section is 14.2. All the other operating conditions are the same as in Example 1. The catalytic cracking results are also listed in Table 2.

[0056] Due to the longer oil and gas residence time in the second reaction section of Example 2, the degree of secondary reaction increases. The yield of liquefied gas increased a lot, and the yield of gasoline and diesel was lower ...

Embodiment 3

[0058] This example illustrates the results of catalytic cracking using Zhongyuan Atmospheric Residue as raw material. The distance from the catalyst inlet of the second reaction section to the feed oil inlet at the top of the downcomer reactor is 50% of the total length of the actual reaction section of the downcomer reactor.

[0059]The operating conditions adopted in this embodiment are: the regeneration temperature of the first regenerator is 705°C, the carbon content of the regenerated semi-regenerated catalyst is 0.22w%, and the semi-regenerated catalyst enters the first reaction section from the top catalyst inlet of the down-flow tubular reactor. The temperature of the regenerated catalyst was 705°C. The regeneration temperature of the second regenerator is 510°C, the carbon content of the regenerated catalyst is 0.05w%, and the temperature of the regenerated catalyst entering the second reaction section from the catalyst inlet in the middle of the downtube reactor is ...

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Abstract

The invention discloses the method and the equipment which under a kind of petroleum refinement process a line of tubular catalysis cracks, mainly uses in to solve the existing on line of -like lifting tube reactor multi- existences catalyst and the oil gas returns mixes seriously, after the next line of tubular reactor technology exists reactor demi-section question and so on catalytic reaction degree drop. The invention uses two section of -like under line of tubular reactor, comes from the first regenerator (5) under the temperature higher half regeneration catalyst and the raw oil (201) enter a line of tubular reactor (3) the crown, (301) under marches forward the line of catalysis cracking reaction along the first response section; After next line of tubular reactor (3) the middle catalyst entrance (304) introduces from the second regenerator (6) the temperature lower regeneration catalyst, with comes from the first response section (301) the under good catalyst and the oil gas mix, enters the secondary reaction section (302) under the continuation to march forward the line of catalysis cracking reaction. The invention mainly uses in the petroleum Heavy tar fraction catalyzed cracking processing.

Description

technical field [0001] The invention relates to a method and a device for catalytic cracking of hydrocarbon oil in petroleum refining process. Background technique [0002] Catalytic cracking is an important technical method for the processing of heavy fractions of petroleum, and occupies a very important position in the oil refining industry. Petroleum heavy fractions (vacuum gas oil, coker gas oil, atmospheric residue, vacuum residue, etc.) undergo high-temperature cracking and condensation reactions under the action of catalytic cracking catalysts to produce dry gas, liquefied gas, gasoline, diesel, Heavy oil (including refined oil and oil slurry) and coke. So far, almost all fluid catalytic cracking unit (FCCU) reactors at home and abroad use riser reactors. In the riser, the raw oil is mixed with the catalyst from the regenerator at the lower part of the riser and goes up the riser. During the rising process, the raw oil undergoes high-temperature cracking reaction un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G11/00
Inventor 王龙延郝希仁刘现峰孟凡东刘金龙陈润良胡重建樊麦耀
Owner SINOPEC LUOYANG PETROCHEM ENG CORP
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