A catalytic cracking unit

A catalytic cracking unit and catalyst regeneration technology, which is applied in catalytic cracking, cracking, petroleum industry, etc., can solve the problems of deteriorated product distribution, catalyst hydrothermal deactivation, low cetane number of catalytic diesel oil, etc., to improve the burning strength and charring efficiency, slowing down hydrothermal deactivation, and increasing the effect of cetane number

Active Publication Date: 2016-06-08
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned conventional catalytic cracking unit, there are the following disadvantages: first, because the length of the riser reactor determines that the reaction time of the raw material is longer (generally about 4s), the longer reaction time is increasing the raw material per pass. At the same time, the conversion rate also intensifies the secondary reaction of the raw material cracking products, so that the yield of cracked gas (the sum of dry gas and liquefied gas yields) is higher, and the yield of gasoline and diesel fractions is lower. At the same time, the catalytic diesel cetane The value is low, not suitable as a vehicle fuel
Second, due to the upward movement of the catalyst against the gravitational field in the riser reactor, the coking catalyst slips and back-mixes. On the upper part of the feed nozzle of the riser reactor, the coking catalyst that slips, the atomized raw material and the primary cracking product Re-contacting reactions, thereby deteriorating product distribution and reducing product selectivity of catalysts for feedstock cracking
Third, due to the relatively low coking intensity of the turbulent bed regenerator, the catalyst storage in the regenerator is relatively high and the catalyst stays in the regenerator for a long time, resulting in serious hydrothermal deactivation of the catalyst
Fourth, catalytic gasoline cannot be modified separately, and its quality is low
However, this technology still has the following shortcomings: First, the inertial separator used at the end of the downcomer reactor is not completely separated from the oil agent, and some oil and gas have a long reaction time
Second, it is not possible to individually upgrade gasoline with a single reactor

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0087] Embodiment 1, comparative example

[0088] Experiments were carried out on a conventional double-riser catalytic cracking pilot plant. The heavy oil riser reactor processes straight-run wax oil transported by Luning Pipeline, and the light hydrocarbon riser reactor processes catalytic gasoline produced by the heavy oil riser reactor. The catalyst adopts commercially available CC-20D catalytic cracking industrial equilibrium catalyst.

[0089] 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.

[0090] The properties of the catalytic cr...

Embodiment 2

[0092] in the approximate figure 1 The test was carried out on the new fluid catalytic cracking pilot plant of the device. Both the heavy oil downcomer reactor and the light hydrocarbon downcomer reactor of the new fluid catalytic cracking pilot plant can be flexibly replaced according to process requirements. The heavy oil down-pipe reactor processes straight-run wax oil from the Luning pipeline that is the same as the comparative example, and the light hydrocarbon down-pipe reactor processes the catalytic gasoline produced by the heavy oil down-pipe reactor. The catalyst is commercially available CC-20D that is the same as the comparative example Cracking industry equilibrium catalyst.

[0093] 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 d...

Embodiment 3

[0096] According to Example 2, the main difference lies in the scorch intensity and scorch time of the turbulent bed regenerator and the riser regenerator, the average gas linear velocity of the riser regenerator, and the reaction time and recycling 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 unit. The catalytic cracking unit mainly comprises a heavy oil descendent tube reactor, a light hydrocarbon descendent tube reactor, a precipitator, a riser regenerator, a turbulent bed regenerator and the like, wherein the turbulent bed regenerator is communicated with the precipitator respectively through the heavy oil descendent tube reactor and light hydrocarbon descendent tube reactor; the precipitator is communicated with the riser regenerator; and the riser regenerator is communicated with the turbulent bed regenerator. The unit can improve the catalytic cracking product distribution, enhance the light oil yield and lower the yield of the cracked gas and coke; the unit can be used for producing low-olefin-content catalytic gasoline and high-cetane-number catalytic diesel; and the unit enhances the charring efficiency and decelerates the hydrothermal inactivation of the catalyst.

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 device. 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): C10G11/00
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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