Method for regenerating waste engine oil by combination of solvent extraction and extraction centrifugation

A technology of waste engine oil and centrifugal compounding, which is applied in the petroleum industry, treating hydrocarbon oil, lubricating composition, etc., can solve the problems of large amount of sulfuric acid and white clay, low oil yield, high operating cost, etc., and achieves low price, The effect of low solvent toxicity and short production cycle

Inactive Publication Date: 2020-01-24
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of them adopt the traditional and backward sulfuric acid clay process, which uses a large amount of sulfuric acid and clay, which inevitably produces a large amount of new acid residue and solid impurities, causing secondary pollution, and the oil yield is not high, which does not

Method used

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  • Method for regenerating waste engine oil by combination of solvent extraction and extraction centrifugation

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Experimental program
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Effect test

Embodiment 1

[0031] Put 100g of waste engine oil in a 1000ml round bottom flask, add 300g of a mixed solution of methanol, n-butanol and toluene, wherein the mass ratio of the mixed solvent is methanol:n-butanol:toluene=1:2:1, then add 0.180 g of ethanolamine was placed on a constant temperature heating magnetic stirrer, the heating switch and the stirring switch were turned on, the temperature was raised to 50° C., and the heating and stirring were stopped after constant temperature extraction for 20 minutes. After extraction and flocculation, introduce the mixed solution into the separatory funnel, put it in a constant temperature box, and separate the sediment in the separatory funnel after standing at 50°C for 12 hours. , Under the condition of pressure -0.1Mpa, the organic solvent is removed by vacuum distillation and recovered to obtain the initially refined waste engine oil.

[0032] Stir and mix the initially refined waste engine oil with NMP at a volume ratio of 1:1, then place it...

Embodiment 2

[0035] Put 100g of waste engine oil in a 1000ml round bottom flask, add 400g of a mixed solution of methanol, n-butanol and toluene, wherein the mass ratio between the mixed solvents is methanol:n-butanol:toluene=1:3:1, and then add 0.480 g of ethanolamine was placed on a constant temperature heating magnetic stirrer, the heating switch and the stirring switch were turned on, the temperature was raised to 40° C., and the heating and stirring were stopped after constant temperature extraction for 30 minutes. After the extraction and flocculation is completed, the mixed solution is introduced into the separatory funnel, placed in a constant temperature box, and the sediment in the separatory funnel is separated after standing at 40°C for 12 hours, and the supernatant is poured into a 1L distillation bottle. Under the condition of pressure -0.1Mpa, the organic solvent is distilled off under reduced pressure and recovered to obtain the initially refined waste engine oil.

[0036] ...

Embodiment 3

[0039] Put 100g of waste engine oil in a 1000ml round bottom flask, add 500g of a mixed solution of methanol, n-butanol and toluene, wherein the mass ratio of the mixed solvent is methanol:n-butanol:toluene=1:4:1, and then add Put 0.900 g of ethanolamine on a constant temperature heating magnetic stirrer, turn on the heating switch and stirring switch, raise the temperature to 30°C, and stop heating and stirring after pumping at constant temperature for 40 minutes. After the extraction and flocculation is completed, the mixed solution is introduced into the separatory funnel, placed in a constant temperature box, and the sediment in the separatory funnel is separated after standing at 30°C for 12 hours, and the supernatant is poured into a 1L distillation bottle. Under the condition of pressure -0.1Mpa, the organic solvent is distilled off under reduced pressure and recovered to obtain the initially refined waste engine oil.

[0040] Stir and mix the initially refined waste en...

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Abstract

The invention provides a method for regenerating waste engine oil by a combination of solvent extraction and extraction centrifugation, and belongs to the technical field of motor vehicle engine oil.The method provided by the invention comprises the following steps: firstly performing extraction-flocculation treatment on the waste engine oil, a flocculant and a mixed solvent, wherein the flocculant is ethanolamine, and the mixed solvent is formed by mixing methanol, n-butanol and toluene; performing constant-temperature sedimentation on the oil-containing mixture, taking the supernatant liquid, and performing distillation at reduced pressure to obtain preliminarily refined waste engine oil; and finally, adding N-methyl pyrrolidone (NMP) into the preliminarily refined waste engine oil, stirring the mixture at a constant temperature for a period of time, and performing centrifugal separation to obtain regenerated oil. Experimental results show that the regenerated oil obtained by the method has a higher recovery rate and better quality, and the method is simple to operate, has mild process conditions, a short production cycle, and environmental protection.

Description

[0001] (1) Technical field [0002] The invention relates to a method for regenerating waste engine oil through combined solvent extraction and extraction centrifugation. [0003] (2) Background technology [0004] Waste engine oil is mixed with water, solid mechanical impurities, other miscellaneous oils during use, and gradually deteriorates in a high-temperature environment to generate asphaltenes, colloids, organic acids, and sulfur- and nitrogen-containing compounds. These deteriorated components It is mainly polycyclic aromatic hydrocarbons, small molecular alkanes and additive components, and most of the remaining hydrocarbons are still effective components of oil products, accounting for about 75% to 90%. After the waste engine oil is processed by a suitable process, the mechanical impurities and deteriorated components are removed, and the base oil that meets the quality requirements can be obtained. [0005] At present, there are six main processes for the regenerati...

Claims

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Application Information

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IPC IPC(8): C10G53/04C10M175/00
CPCC10G53/04C10G2300/1007C10G2400/10C10M175/0016C10M175/0033C10M175/005C10M175/0083
Inventor 李国华马超胜戴飞杨新
Owner ZHEJIANG UNIV OF TECH
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