Catalytic cracking method

A catalytic cracking and catalyst technology, applied in the direction of catalytic cracking, cracking, only multi-stage series refining and cracking process treatment, etc., to achieve the effects of reducing dry gas and coke yield, easy temperature control, and reducing strippable coke

Active Publication Date: 2015-07-22
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a method that can overcome the high contact temperature between the regenerated catalyst and the raw material oil, the low ratio of agent to oil, the long reaction time, and the serious back-mixing of the catalyst in the reactor that exist in the existing conventional catalytic cracking process. Catalytic cracking method with comprehensive technical difficulties such as low stripping efficiency and regeneration efficiency, and catalytic gasoline cannot be individually upgraded

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0099] Embodiment 1, comparative example

[0100] Experiments were carried out on a conventional double-riser catalytic cracking pilot plant. The heavy oil riser reactor processes Daqing atmospheric residue, and the light hydrocarbon riser reactor processes the catalytic gasoline produced by the heavy oil riser reactor. The commercially available CC-20D catalytic cracking industrial equilibrium catalyst is used as the catalyst.

[0101] The design capacity of the heavy oil riser reactor is 60kg / d, simulating the full back refining operation, the heavy oil raw material is mixed with the recycle oil and enters the heavy oil riser reactor through the feed nozzle; the design capacity of the light hydrocarbon riser reactor is 24kg / d . The carbon content of the regenerated catalyst is 0.03w%, and the microreaction activity is 62. The stripping medium in the stripping section is steam, and the stripping temperature is 500°C.

[0102] The properties of the catalytic cracking feedst...

Embodiment 2

[0104] in the approximate figure 1 The test is carried out on the new fluid catalytic cracking pilot plant of the device shown. In this new type of fluid catalytic cracking pilot plant, heavy oil downcomer reactors and light hydrocarbon downcomer reactors can be flexibly replaced according to process needs. The heavy oil down tube reactor processes the same Daqing atmospheric residue as the comparative example, and the light hydrocarbon down tube reactor processes the catalytic gasoline produced by the heavy oil down tube reactor. The catalyst is commercially available CC-20D catalytic cracking industrial balance same catalyst.

[0105] The design capacity of the heavy oil down tube reactor is 60kg / d, simulating the full back refining operation, the heavy oil raw material is mixed with the recycle oil and enters the heavy oil down tube reactor through the feed nozzle; the designed capacity of the light hydrocarbon down tube reactor is 30 kg / d , the carbon content of the rege...

Embodiment 3

[0108] According to Example 2, the main difference lies in the regeneration temperature, scorch intensity and scorch time of the turbulent bed regenerator and the riser regenerator, the average gas linear velocity of the riser regenerator, the temperature of the mixed regeneration catalyst, and the reaction of the heavy oil downcomer The fuel oil ratio of the reactor and the light hydrocarbon downcomer reactor, and the recycle ratio of the heavy oil downcomer reactor. See Table 6 for the main operating conditions and product distribution of the new FCC unit implemented in this implementation. The main properties of the liquid products of the new fluid catalytic cracking unit are shown in Table 7.

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Abstract

The invention discloses a catalytic cracking method. A downer reactor is respectively subjected to heavy oil catalytic cracking and light hydrocarbon catalytic modification, and a reactant enters a settler so as to be subjected to gas-solid separation; after being mixed and stripped, the spent catalyst is scorched and regenerated together with a part of regenerated catalyst through a riser regenerator, and a semi-regenerated catalyst enters a turbulent bed so as to be further regenerated; a part of regenerated catalyst enters a catalyst mixing tank after being cooled by an external cooler and is mixed with the other part of regenerated catalyst, and then, the regenerated catalyst returns to two reactors in two paths so as to be recycled; the reacted oil gas is subjected to fractional distillation. By using the catalytic cracking method, the distribution of catalytic cracked products can be improved, the yield of light oil can be increased, and the yields of cracked gas and cokes can be reduced.

Description

technical field [0001] The invention relates to the field of catalytic cracking of hydrocarbon oil in the absence of hydrogen, in particular to a catalytic cracking method. Background technique [0002] At present, although the devices used in the catalytic cracking process in the petrochemical industry are various, the process form of the reaction regeneration system is basically the same. Most of them use a single riser reactor (or a combination of a single riser and a fast stage reactor) and a turbulent bed regenerator (or a two-stage regenerator combining a turbulent bed and a fast bed). Catalyst and raw oil are contacted and mixed at the bottom of the riser and then reacted upward along the riser. The reactant flow enters the settler from the outlet at the top of the riser to separate the reaction oil gas from the catalyst; Enter the regenerator to regenerate coke; the regenerated catalyst returns to the bottom of the riser for recycling. In the above-mentioned conven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G55/06C10G11/18
Inventor 陈曼桥王文柯武立宪张亚西孟凡东樊麦跃陈章淼黄延召李秋芝吴辰捷
Owner CHINA PETROCHEMICAL CORP
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