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Method to mitigate fouling of a vacuum wash bed

a technology of vacuum wash bed and wash bed, which is applied in the direction of vacuum distillation, hydrocarbon oil treatment, corrosion/fouling inhibition of treatment apparatus, etc., to achieve the effects of preventing thermoset, reducing injection rate, and preventing the buildup of soft-solid or viscous polymer

Inactive Publication Date: 2019-06-06
MARATHON PETROLEUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]A second embodiment of the invention introduces the solvent continuously, during operations, at a much smaller injection rate, to hinder the buildup of the soft-solid or viscous polymer in the wash bed and thus prevent the thermoset from ever forming.
[0008]In still another embodiment, a combination of an LCO and steam is effective in preventing the formation of a thermoset polymer in the wash beds.

Problems solved by technology

When the fouling / coking of the wash bed becomes a serious impediment to operating efficiency, the entire process unit may be taken off-stream for an extended period for renewal of the wash beds.

Method used

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  • Method to mitigate fouling of a vacuum wash bed
  • Method to mitigate fouling of a vacuum wash bed
  • Method to mitigate fouling of a vacuum wash bed

Examples

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Embodiment Construction

[0018]The cooling of the vacuum tower wash bed below 350° F. causes a thermoset polymer to form, which then cannot be removed except by mechanical means. An injection of a solvent such as LCO before the temperature of the wash drops below 350° F. removes the polymer before it hardens.

[0019]The LCO contains petroleum distillates. In one embodiment, the LCO is a complex mixture of paraffinic, cycloparaffinic, olefinic and aromatic hydrocarbons. The LCO is predominately C9-C25 hydrocarbons produced by the distillation of products from a catalytic cracking process. This stream is likely to contain a relatively large portion of bicyclical aromatic hydrocarbons.

[0020]In another embodiment, the fluid medium may be an FCC slurry or decanted oil. Typically, the FCC slurry consists of aromatic hydrocarbons from FCC slurry oil processing technologies including hydrotreating, solvent refining and other separation techniques. Decanted oil may be a fluid catalytic cracker decanted oil, a heavy cy...

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Abstract

Fluid medium such as light cycle oil, water, FCC slurry and decanted oil, improve this method for vacuum distillation of a petroleum product. The method may be used in the petroleum refining industry for fractionating of petroleum base stock in a vacuum column. The fluid medium prevents the formation of thermoset polymers and the resultant fouling of the wash beds in the vacuum column.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]The present patent application is a continuation application of non-provisional application Ser. No. 15 / 342,310, filed Nov. 3, 2016, which claims the benefit of provisional patent application No. 62 / 251,285, filed on Nov. 5, 2015.TECHNICAL FIELD[0002]This invention relates to a method for mitigating fouling of a vacuum tower wash bed during the vacuum distillation of a petroleum product. The invention may be used in the petroleum refining industry for fractionating of petroleum base stock in a vacuum column.BACKGROUND OF THE INVENTION[0003]Refinery fractionator wash beds are monitored for fouling / coking of the wash bed on a regular basis. The density of the fouling / coking in the wash beds increase over time, which allows for a prediction of the tower's ability to run efficiently over time.[0004]When the fouling / coking of the wash bed becomes a serious impediment to operating efficiency, the entire process unit may be taken off-stream for a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G7/06C10G75/00
CPCC10G7/06C10G75/00C10G2300/807
Inventor CANTLEY, GREGORY A.JOHNSON, JAMES F.SEXTON, JEFF
Owner MARATHON PETROLEUM
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