Combined process of hydrotreatment and catalytic cracking for residual oil

A hydrotreating and catalytic cracking technology, applied in hydrotreating process, petroleum industry, hydrocarbon oil treatment, etc., can solve the problems of complex equipment, low conversion rate of fixed bed, complicated operation, etc., and reduce the difficulty of reaction and harsh processing The effect of reducing the speed, type and number of devices, and improving the reaction effect

Active Publication Date: 2013-05-15
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Among them, the fixed bed conversion rate is low (generally lower than 35%), which mainly provides high-quality raw materials for catalytic cracking units; Oil products need to be further refined to obtain qualified products; suspension bed can obtain higher conversion rate (generally higher than 80%), but the stability of the device is poor, and it is still difficult to achieve industrial stable operation; the conversion rate of moving bed is between Between fixed bed and ebullating bed, the problem is that the device is complicated and the operation is difficult
The disadvantage of this route is that it has poor adaptability to crude oil and is suitable for processing light and some medium sour crude oil
For ebullating bed reactors, each reactor requires a set of online catalyst addition system, which requires a high investment (accounting for about half of the total investment of ebullated bed hydrogenation units after evaluation), and the operation Complex, with the highest failure rate

Method used

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  • Combined process of hydrotreatment and catalytic cracking for residual oil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this embodiment, the fluidized bed, fixed bed, and catalytic cracking combined process in the hydrotreating of the residue is used to carry out the hydroconversion of the residue. First, the residual oil feedstock is preheated and mixed with the catalytically cracked heavy distillate oil and hydrogen into the boiling bed hydrotreating unit, and the hydrogenation reaction is carried out under the prepared different boiling bed hydrogenation catalysts and process conditions to remove the raw material. Heteroatoms such as sulfur, nitrogen and metals can also convert asphaltenes into colloids or smaller molecules to reduce product viscosity. The hydrogenated product is separated to obtain liquid-phase reformed oil, which enters the fixed-bed hydrogenation unit The reaction is carried out, and the product oil is obtained under the fixed bed graded catalyst and reaction conditions. The produced oil enters the catalytic cracking unit to be further cracked and converted into ...

Embodiment 2

[0047] Compared with Example 1, the fluidized bed reactor uses a mixed catalyst. The long-term stability of the fixed bed is good, as shown in Table 4, where the temperature of the fixed bed reactor is increased by 3°C at 5000, 8000, and 12000 hours.

[0048] Table 5 The stability results of the fixed bed hydrogenation reaction system.

[0049] Example Example 1 Example 2 Operating time, hour Metal content of the final oil (μg / g) / total pressure drop of the fixed bed reaction system (MPa) Metal content of the final oil (μg / g) / total pressure drop of the fixed bed reaction system (MPa) 5008.5 / 0.066.3 / 0.06 50008.7 / 0.086.8 / 0.06 80008.2 / 0.095.9 / 0.07 120009.1 / 0.116.5 / 0.08

[0050] It can be seen from the stability experiment results of the above-mentioned fixed bed reaction system that the method of the present invention can realize the long-period stable operation of the fixed bed hydrotreating device. According to the development trend, it can be predicted that the method of the ...

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Abstract

The invention discloses a combined process of hydrotreatment and catalytic cracking for residual oil. The combined process comprises the following steps: (1) mixing a residual oil raw material and heavy distillate oil of a catalytic cracking unit and allowing an obtained mixture to enter into a fluidized bed hydrotreatment unit for fluidized bed hydrotreatment; (2) allowing an effluent of fluidized bed hydrotreatment obtained in the step (1) to enter into a fixed bed hydrotreatment unit for fixed bed hydrotreatment, wherein generated oil of an effluent of fixed bed hydrotreatment is used as a raw material for the catalytic cracking unit; and (3) mixing the residual oil raw material with a catalytic heavy fraction obtained after dry gas, liquefied gas and catalytic gasoline are separated from an effluent of a catalytic cracking reaction and subjecting an obtained mixture to fluidized bed hydrotreatment. Compared with the prior art, the combined process provided by the invention has the advantages of wide sources of the raw materials, low equipment investment, stable operation, a long operation period and a good synergistic and coordination effect.

Description

technical field [0001] The present invention relates to a combined process method of residue oil hydrotreating and catalytic cracking, specifically organically combining residue oil fluidized bed hydrogenation treatment, fixed bed hydrogenation treatment and catalytic cracking to process inferior residue oil raw materials to produce gasoline products combination process. Background technique [0002] With the increase of heavy and inferior crude oil and the change of market demand structure for light oil, the processing technology of inferior heavy oil (including various heavy oil and residual oil, etc.) has become the research focus of major oil companies and petroleum scientific research institutions direction. The processing of inferior heavy oil is not only to crack it into products with low boiling point, such as naphtha, middle distillate oil and vacuum gas oil, but also to increase their hydrogen-carbon ratio, so the basic way of its processing is basically There ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G69/04
Inventor 朱慧红方向晨孙素华刘杰杨光金浩
Owner CHINA PETROLEUM & CHEM CORP
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