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Method for recycling waste mineral oil

A waste mineral oil and diluent technology, applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve problems such as blockage of the outlet pipeline of the hydrogenation reaction material, coking of the treatment furnace tube, corrosion of the hydrogenation equipment, etc. Achieve the effect of overcoming serious corrosion of hydrogenation equipment

Inactive Publication Date: 2021-03-09
CHANGLING PETRO CHEM ENG DESIGN
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  • Claims
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Problems solved by technology

This process technology overcomes the deficiencies of the existing technology, mainly in solving the coking of waste mineral oil distillation pretreatment furnace tube, blockage of decompression tower, serious corrosion of hydrogenation equipment, coking of hydrogenation catalyst bed, hydrogenation reaction material outlet pipeline Problems such as blockage

Method used

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  • Method for recycling waste mineral oil
  • Method for recycling waste mineral oil

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Experimental program
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Effect test

Embodiment 1

[0039] 1. Mix 6.25t / h of waste mineral oil after sedimentation pretreatment with a certain amount of diluent and deslagging agent, heat it to about 90°C, and deslagging by decanter centrifuge;

[0040]2. After centrifugal deslagging, the waste mineral oil is heated to about 180°C and sent to the dehydration tower for degassing and dehydration;

[0041] 3. After dehydration and degassing, the waste mineral oil is sent to a vacuum heating furnace to be heated to 320°C for vacuum fractionation in a vacuum fractionation tower, and the diluent and hydrogenation raw material are cut out, and the diluent is returned to the previous process for recycling, and the hydrogenation raw material Sent to the low-pressure hydrogenation process; the vacuum fractionation column controls the pressure to about 2.5kPa (A);

[0042] 4. After decompression cutting, the hydrogenation raw material is raised to 4.5MPa(G), and then heated to 320°C in a hydrogenation heating furnace, and then enters the ...

Embodiment 2

[0046] 1. Mix 12.5t / h of waste mineral oil after sedimentation pretreatment with a certain amount of diluent and deslagging agent, heat it to about 90°C, and deslagging by centrifuge;

[0047] 2. After centrifugal deslagging, the waste mineral oil is heated to about 180°C and sent to the dehydration tower for degassing and dehydration;

[0048] 3. After dehydration, the waste mineral oil is sent to the decompression heating furnace to be heated to 330°C, and the diluent and hydrogenation raw material are cut out. The diluent is returned to the previous process for recycling, and the hydrogenation raw material is sent to the low-pressure hydrogenation part. Vacuum fractionation column control pressure is about 2.5kPa (A);

[0049] 4. After decompression cutting, the hydrogenation raw material is raised to 5.5MPa(G), and then heated to 330°C in a low-pressure hydrogenation furnace, and then enters the protection reactor, dechlorination reactor and refining reactor respectively. ...

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Abstract

The invention discloses a method for recycling waste mineral oil. Settling pretreatment, reduced pressure distillation and hydrofining are adopted as a process route for recycling the waste mineral oil. A centrifugal process is added in reduced pressure distillation, a diluent and a deslagging agent are introduced, partial pressure of a reduced pressure system is reduced while impurities are removed, and the diluent is recycled. High-pressure and low-pressure two-stage hydrogenation is adopted for hydrofining. The technology solves the problems of coking of a waste mineral oil distillation pretreatment furnace tube, blockage of a vacuum tower, serious corrosion of hydrogenation equipment, coking of a hydrogenation catalyst bed layer, blockage of a hydrogenation reaction material outlet pipeline and the like in the prior art. The process is scientific and reasonable in technology, stable in long-period operation, efficient, environmentally friendly, high in product quality and obvious in economic benefit.

Description

Technical field: [0001] The invention relates to a process technology for recycling waste mineral oil, in particular to a method for recycling waste mineral oil obtained by sedimentation pretreatment + vacuum distillation + hydrofining. Background technique: [0002] The comprehensive utilization process of waste mineral oil is mainly divided into three modules: sedimentation pretreatment, distillation pretreatment, and refining posttreatment. Settling pretreatment usually adopts the method of heating and natural sedimentation; there are many distillation pretreatment techniques, such as kettle distillation, vacuum distillation, molecular distillation, thin film evaporation, etc.; post-refining treatment includes acid-base refining, clay refining, solvent refining, hydrogenation Refined etc. Kettle distillation and acid-base refining are technologies that are explicitly prohibited in the industry due to serious pollution. At present, domestic and international waste minera...

Claims

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Application Information

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IPC IPC(8): C10G67/02
CPCC10G67/02C10G2300/4006C10G2300/4012C10G2300/70C10G2300/205C10G2300/202
Inventor 任新蔡国球王萌
Owner CHANGLING PETRO CHEM ENG DESIGN
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