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Combined process of hydrotreatment and light fraction-conversion for residual oil

A technology for hydrotreating and residual oil hydrogenation, which is applied in hydrotreating process, petroleum industry, processing hydrocarbon oil, etc., can solve the problems of difficult to realize industrial operation, low conversion rate of fixed bed, poor device stability, etc. The effect of logistics distribution and mass transfer, reduction of reaction difficulty and processing severity, and improvement of properties

Active Publication Date: 2015-04-01
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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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 oil needs to be further processed to obtain qualified products; 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 Among them, 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 of hydrotreatment and light fraction-conversion for residual oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this example, a combined process of solvent deasphalting, ebullating bed, fixed bed, and catalytic cracking is used to carry out hydroconversion 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 oil slurry and mixed with hydrogen to boil. Bed hydrogenation treatment device, under the prepared fluidized bed hydrogenation catalyst and process conditions, hydrogenation reaction is carried out to remove sulfur, nitrogen, metal and other heteroatoms in the raw material, and at the same time convert asphaltenes into colloids or smaller molecules , to reduce the product viscosity, the fluidized bed hydrogenation product is mixed with the refined oil, filtered to remove impurities, mixed with deasphalted oil into the fixed bed hydrogenation unit for reaction, and...

Embodiment 2

[0053] Compared with Example 1, the ebullated bed reactor uses mixed catalysts. 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.

[0054] Table 5 Stability results of the fixed bed hydrogenation reaction system.

[0055] 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 13.2 / 0.06 11.4 / 0.06 5000 12.6 / 0.09 10.8 / 0.07 8000 14.5 / 0.10 11.6 / 0.08 12000 13.8 / 0.12 12.3 / 0.10

[0056] 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 d...

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Abstract

The invention discloses a combined process of hydrotreatment and light fraction-conversion for residual oil. The combined process comprises the following steps: (1) allowing an inferior heavy oil feedstock to enter into a solvent deasphalting device so as to obtain deasphalted oil and de-oiled asphalt; (2) mixing the de-oiled asphalt obtained in step (1) with at least a part of oil slurry and allowing an obtained mixture to enter into a fluidized bed hydrotreatment unit for fluidized bed hydrotreatment; (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 a 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 feedstock for the catalytic cracking unit; and (4) carrying out treatment in a fractionating tower of the catalytic cracking unit so as to obtain catalytic cracking reaction products including a gasoline fraction, a diesel oil fraction, recycle oil and oil slurry. Compared with the prior art, the combined process provided by the invention has the advantages of wide sources of the feedstocks, 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 of hydrogenation treatment and lightening of residue oil, which is especially suitable for effective processing of low-quality residue oil with high heavy metal content. 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): C10G67/00
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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