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Method for removing asphalt from oil residues under reduced pressure

A technology of vacuum oil and oil bitumen, which is applied in the field of vacuum oil residue removal of bitumen, which can solve the problems of high energy consumption, high pressure and temperature, equipment investment and high energy consumption, and achieve low energy consumption, improved quality and recycling The effect of high efficiency and energy consumption

Active Publication Date: 2015-07-08
河北亚鼎新材料科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The conventional method of removing asphalt is the extraction method. In the extraction tower, the low molecular weight oil can be dissolved in the extraction solvent while the asphaltenes cannot be dissolved to achieve removal. However, if one-stage extraction is used in conventional extraction, it will have a greater impact on the quality and recovery rate of deasphalted oil, and if two or more stages are used, the equipment investment and energy consumption will be high. The removal of medium extraction solvent generally adopts steam stripping method, which requires high pressure and temperature, and the temperature of the stripped solvent is high and energy is needed to cool it, and the energy consumption is high

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  • Method for removing asphalt from oil residues under reduced pressure

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Embodiment 1

[0017] A method for removing bitumen from vacuum oil residue, comprising the following steps:

[0018] (1) Pretreatment of vacuum oil residue: preliminarily heat the vacuum oil residue to a temperature of 100°C;

[0019] (2) Supercritical countercurrent extraction: The extraction solvent and the pretreated vacuum oil residue are contacted in countercurrent in the pre-extraction section in the middle of the extraction tower. The volume ratio of the extraction solvent to the pretreated vacuum oil residue is 8:1, and the extraction The temperature is 70°C, the mixing time is 4 hours, and the extraction pressure is 4.2Mpa. The upper crude deasphalted oil a and the lower crude deoiled asphalt b are obtained. The upper crude deasphalted oil a enters the upper part of the extraction tower together with the extraction solvent. In the refined deasphalting section, the volume ratio of the extraction solvent to the crude deasphalted oil a in the refined deasphalted section is 1.5:1, the...

Embodiment 2

[0026] A method for removing bitumen from vacuum oil residue, comprising the following steps:

[0027] (1) Pretreatment of vacuum oil residue: preliminarily heat the vacuum oil residue to a temperature of 110°C;

[0028] (2) Supercritical countercurrent extraction: The extraction solvent and the pretreated vacuum oil residue are contacted countercurrently in the pre-extraction section in the middle of the extraction tower. The volume ratio of the extraction solvent to the pretreated vacuum oil residue is 9:1, and the extraction The temperature is 70°C, the mixing time is 4 hours, and the extraction pressure is 4.3Mpa. The upper crude deasphalted oil a and the lower crude deoiled asphalt b are obtained. The upper crude deasphalted oil a enters the upper part of the extraction tower together with the extraction solvent. In the refined deasphalting section, the volume ratio of the extraction solvent to the crude deasphalted oil a in the refined deasphalted section is 1.5:1, the ...

Embodiment 3

[0035] A method for removing bitumen from vacuum oil residue, comprising the following steps:

[0036] (1) Pretreatment of vacuum oil residue: preliminarily heat the vacuum oil residue to a temperature of 90°C;

[0037](2) Supercritical countercurrent extraction: The extraction solvent and the pretreated vacuum oil residue are contacted countercurrently in the pre-extraction section in the middle of the extraction tower. The volume ratio of the extraction solvent to the pretreated vacuum oil residue is 9:1, and the extraction The temperature is 60°C, the mixing time is 5 hours, and the extraction pressure is 4.3Mpa to obtain the upper crude deasphalted oil a and the lower crude deoiled asphalt b, and the upper crude deasphalted oil a enters the upper part of the extraction tower together with the extraction solvent In the refined deasphalting section, the volume ratio of the extraction solvent to the crude deasphalted oil a in the refined deasphalted section is 1.5:1, the ext...

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Abstract

The invention relates to a method for removing asphalt from oil residues under reduced pressure, belonging to the field of petrochemical industry. A pre-extraction section, a fine removal section and a fine extraction section are adopted in one extraction tower to remove asphalt from oil residues under reduced pressure, thereby avoiding high equipment investment and high energy consumption caused by designing multiple extraction towers, and enhancing the quality and recovery rate of the deasphalted oil. Vacuum fractionating is adopted to recover the extraction solvent in the asphalt. The method has the advantages of low energy consumption and high efficiency.

Description

technical field [0001] The invention relates to a method for removing asphalt from vacuum oil residue, which belongs to the field of petrochemical industry. Background technique [0002] Under the conditions of vacuum distillation, some valuable high-viscosity lubricating oil components in paraffin base or intermediate base crude oil remain in the vacuum residue due to their high boiling point and cannot be vaporized. Industrially, they are used together with other substances (colloid and asphalt) are separated by the difference in solubility in the solvent. Commonly used solvents are propane, butane, pentane, hexane or mixtures of propane and butane. Propane is often used as a solvent when preparing base oil for high-viscosity lubricating oil. Propane deasphalting units in China can usually produce two types of deasphalted oil, namely light deasphalted oil with low carbon residue value and heavy deasphalted oil with high carbon residue value, which can be used as lubrica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G53/00
Inventor 董亚伦
Owner 河北亚鼎新材料科技有限公司
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