Catalytic cracking method and device combined with hydrotreating

A technology for hydrotreating and catalytic cracking, which is applied in hydrotreating process, treatment of hydrocarbon oil, hydrocarbon oil treatment products, etc., can solve problems such as prolific production of gasoline with low olefin content and high octane number, etc., and improve the conversion depth. and selectivity, reduction of olefin content, effect of low olefin content

Active Publication Date: 2021-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is used for catalytic cracking of heavy oil, the conversion rate of heavy oil and the yield of propylene are high, and the yield of dry gas and coke is low, but it does not involve how to produce more gasoline with low olefin content and high octane number

Method used

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  • Catalytic cracking method and device combined with hydrotreating
  • Catalytic cracking method and device combined with hydrotreating
  • Catalytic cracking method and device combined with hydrotreating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] Embodiment 1 is carried out in medium-scale riser catalytic cracking unit, and adopts figure 1The process flow diagram shown is carried out, the internal diameter of the first riser reactor of this medium-sized device is 16 mm, and the height is 3800 mm, the internal diameter of the second riser reactor is 16 mm, and the height is 3200 mm, the second riser reactor The outlet is connected to the fluidized bed reactor. The inner diameter of the fluidized bed reactor is 64mm and the height is 600mm.

[0100] A stream of regenerated catalyst is introduced into the first riser reactor through the first regenerated inclined tube, and flows upward under the action of the pre-lift medium (steam); raw material B is preheated and mixed with atomized water vapor, and passed through the feed The nozzle enters the first riser reactor and contacts with the hot regenerated catalyst to carry out the catalytic conversion reaction. The reacted oil gas and catalyst mixture go up the first...

Embodiment 2

[0113] Carried out by a method similar to that of Example 1, except that the mixture ratio (A-2:C=1:3) of the hydrotreated cracked heavy oil fraction (raw material A-2) and the cracked gasoline fraction (raw material C) was changed, And the operating conditions of the combined reactor formed by the second riser reactor and the fluidized bed reactor, the main operating conditions and results of the experiment are listed in Table 3.

Embodiment 3

[0118] Carried out by a method similar to that of Example 1, only changing the ratio (A-2:C=1:2) of the mixture of hydrotreated cracked heavy oil fraction (raw material A-2) and cracked gasoline fraction (raw material C), As well as the relevant operating conditions, the main operating conditions and results of the experiments are listed in Table 3.

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Abstract

The invention relates to the field of catalytic cracking, and discloses a catalytic cracking method and device combined with hydrotreating. The method includes: introducing heavy raw materials and catalysts into a riser for reaction and separation, and introducing oil and gas into a product separation system for separation. Obtain cracked heavy oil; hydrogenate at least part of the cracked heavy oil with a catalyst to obtain a hydrotreated cracked heavy oil fraction; introduce the hydrotreated cracked heavy oil and gasoline into a riser to react with the catalyst, and After the injection point of the treated cracked heavy oil fraction and gasoline, light hydrocarbons are introduced into the riser for reaction; the mixture containing oil gas and catalyst obtained in the riser is introduced into the fluidized bed connected in series to continue the reaction. The catalytic cracking method and device combined with hydrotreating provided by the invention can increase the conversion depth of heavy oil in the device, increase the yield of propylene, and reduce the yield of dry gas and coke, while producing more gasoline with low olefin content and high octane number.

Description

technical field [0001] The invention relates to the field of catalytic cracking, in particular to a catalytic cracking method combined with hydrotreating and a catalytic cracking unit combined with hydrotreating. Background technique [0002] Catalytic cracking of heavy oil is an important method for preparing small molecular olefins such as ethylene, propylene and butene. The method for producing light olefins by catalytic cracking of heavy oil used in industry includes the catalytic cracking technology (DCC, USP4980053 and USP5670037) of producing propylene in a large amount and the catalytic thermal cracking technology (CPP, USP6210562) of producing ethylene in a large amount, and these two methods adopt The reactor structure of single riser reactor or single riser reactor combined with fluidized bed cooperates with special catalyst to react at higher temperature. [0003] Although the above two existing technologies can produce low-carbon olefins such as propylene and e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G69/04
CPCC10G69/04C10G2400/02
Inventor 高永灿崔琰谢朝钢朱金泉杨轶男
Owner CHINA PETROLEUM & CHEM CORP
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