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Combined process for in-depth conversion of residual oil

A combined process and residual oil technology, applied in the petroleum industry, hydrotreating process, processing hydrocarbon oil, etc., can solve the problems of difficult operation, low conversion rate, complicated operation, etc., to improve the yield of high value-added products, The effect of reducing the viscosity of raw materials and improving process conditions

Active Publication Date: 2015-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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; the ebullated bed conversion rate is higher (generally higher than 60%), and a large amount of light oil can be obtained, but The product needs to be further processed to obtain a qualified product; the suspension bed can obtain a higher conversion rate (generally higher than 80%), but the stability of the device is poor, and it is still difficult to realize industrial operation; the moving bed is between the fixed bed and the ebullating bed. The existing problem is that the device is complicated and the operation is difficult
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 for in-depth conversion of residual oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In this example, a combined process of solvent deasphalting, ebullating bed, fixed bed, and catalytic cracking is used to carry out hydrogenation and deep conversion of residual oil. First, the residual oil raw material and pentane solvent are uniformly mixed in a static mixer, and then enter a two-stage solvent deasphalting device to obtain deasphalted oil and deoiled asphalt. After preheating, the deoiled asphalt is mixed with hydrogen and enters the fluidized bed for hydrotreating The device performs hydrogenation reaction under the prepared fluidized bed hydrogenation catalyst and process conditions, removes sulfur, nitrogen, metal and other heteroatoms in the raw material, and at the same time converts asphaltenes into colloids or smaller molecules, reducing product viscosity , The hydrogenation product is separated to obtain a liquid-phase modified product oil, which is mixed with the deasphalted oil into a fixed-bed hydrogenation unit for reaction, and the product...

Embodiment 2

[0054] Compared with Example 1, the ebullated bed reactor uses a mixed catalyst. The long-term stability of the fixed bed is good, see Table 4 for details, and the temperature of the fixed bed reactor was increased by 3°C at 5000, 8000 and 12000 hours.

[0055] Table 5 Stability results of the fixed bed hydrogenation reaction system.

[0056] Example Example 1 Example 2 Operating time, hours Final oil metal content (μg / g) / total pressure drop of fixed bed reaction system (MPa) Final oil metal content (μg / g) / total pressure drop of fixed bed reaction system (MPa) 500 15.2 / 0.06 13.2 / 0.06 5000 15.3 / 0.10 13.1 / 0.08 8000 15.6 / 0.11 13.8 / 0.09 12000 15.7 / 0.13 13.1 / 0.10

[0057] As can be seen from the stability experiment results of the above-mentioned fixed bed reaction system, the method of the present invention can realize the long-term stable operation of the fixed bed hydrotreating unit, and it can be predicted according to the ...

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Abstract

The invention discloses a combined process for in-depth conversion of residual oil. The combined process comprises the following steps: (1) mixing a residual oil raw material with at least part of oil slurry of a catalytic cracking unit and allowing an obtained mixture to enter into a solvent deasphalting unit so as to obtain deasphalted oil and de-oiled asphalt; (2) allowing the de-oiled asphalt obtained in step (1) to enter into a fluidized bed hydrotreatment unit and carrying out fluidized bed hydrotreatment in the presence of hydrogen and a fluidized bed hydrotreatment catalyst; and (3) mixing an effluent of fluidized bed hydrotreatment obtained in the step (2) with the deasphalted oil, adding at least a part of recycle oil of the catalytic cracking unit at the same time and allowing an obtained mixture to enter into a fixed bed hydrotreatment unit, wherein generated oil of an effluent of fixed bed hydrotreatment is used as a raw material for the catalytic cracking unit. 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 invention relates to a combined process method for deep conversion of residual oil, which is especially suitable for low-quality residual oil with high heavy metal content. The oil is converted to light distillates. 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 are two methods of hydrogenation or decarburization. Decarbonization processes include coking, solvent deasphalting, heavy oil catal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G69/00
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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