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Preparation method for regenerating base oil from waste lubrication oil

A technology for regenerating base oil and waste lubricating oil, applied in lubricating compositions and other directions, can solve the problems of poor product quality, hazardous waste pollution in the clay environment, and unqualified products, so as to solve the problem of secondary pollution and reduce hazardous waste pollution. , The effect of large operational flexibility

Active Publication Date: 2018-01-12
HEBEI JINGU RECYCLING RESOURCES DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The more developed the country and the higher the degree of mechanization, the more waste lubricating oil is produced; now our country produces more than 7 million tons of waste lubricating oil every year, and it is estimated that it will exceed 10 million tons by 2020; the extensive utilization of these waste lubricating oil will not only It will cause huge waste of resources and also cause great harm to the environment.
[0003] At present, the utilization rate of waste lubricating oil in my country is quite low, and the utilization of waste lubricating oil is mostly reflected in the regeneration of base oil. The traditional regeneration methods based on waste lubricating oil mainly include the following three methods: one is to use chemical methods to process waste lubricating oil Oil regeneration, this method will produce a large amount of free acid and free alkali, and the products produced are unqualified; instead, high-temperature distillation is used to process waste lubricating oil for regeneration. This method will change some properties of waste lubricating oil due to high temperature, and will also produce high Molecular polymers not only produce poor quality products, but also produce some residual pollutants, causing secondary pollution to the environment; the third is molecular distillation, which is the latest technology for the regeneration of waste lubricating oil. There are two problems that are difficult to solve: on the one hand, it will produce a lot of peculiar smell, which is not easy to remove; on the other hand, the color is too dark to meet the requirements of base oil
[0004] Chinese patent 2010102557558 discloses a process method for regenerating base oil from waste lubricating oil. Base oil is prepared by pretreatment, thin film evaporation, molecular distillation, clay refining and flash degassing. Value recycling provides a new way, but the large amount of clay it uses will cause hazardous waste pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Preprocessing

[0029] Pump the waste lubricating oil into the settling tank with stirring, stir for 10~60min, heat up at the same time, keep the waste lubricating oil at 60~80℃ for 2~12h, and the acid value exceeds 0.05mg KOH / g waste lubricating oil Add 0.5~10% caustic soda to neutralize to 0.05mg KOH / g waste lubricating oil; continue to heat up to 100~120°C, turn on the vacuum pump to draw negative pressure, and keep the pressure at 0.09Mpa for 2 hours, so that the water content reaches within 0.5%. into raw material oil, and then pumped into the raw material tank for temporary storage. This step is used to dehydrate the waste lubricating oil.

[0030] In this embodiment, the stirring time is 30 minutes, the standing settling temperature is 70° C., and the settling time is 10 hours; the vacuum dehydration temperature is 110° C.

[0031] 2) Flash degassing

[0032] The pretreated raw oil is preheated by a heat exchanger to above 140°C and enters into a flash towe...

Embodiment 2

[0046] 1) Preprocessing

[0047] Pump the waste lubricating oil into the settling tank with stirring, stir for 10~60min, heat up at the same time, keep the waste lubricating oil at 60~80℃ for 2~12h, and the acid value exceeds 0.05mg KOH / g waste lubricating oil Add 0.5~10% caustic soda to neutralize to 0.05mg KOH / g waste lubricating oil; continue to heat up to 100~120°C, turn on the vacuum pump to draw negative pressure, and keep the pressure at 0.09Mpa for 2 hours, so that the water content reaches within 0.5%. into raw material oil, and then pumped into the raw material tank for temporary storage. This step is used to dehydrate the waste lubricating oil.

[0048]In this embodiment, the stirring time is 60 minutes, the standing settling temperature is 80°C, and the settling time is 12h; the vacuum dehydration temperature is 120°C.

[0049] 2) Flash degassing

[0050] The pretreated raw oil is preheated by a heat exchanger to above 140°C and enters into a flash tower, where ...

Embodiment 3

[0064] 1) Preprocessing

[0065] Pump the waste lubricating oil into the settling tank with stirring, stir for 10~60min, heat up at the same time, keep the waste lubricating oil at 60~80℃ for 2~12h, and the acid value exceeds 0.05mg KOH / g waste lubricating oil Add 0.5~10% caustic soda to neutralize to 0.05mg KOH / g waste lubricating oil; continue to heat up to 100~120°C, turn on the vacuum pump to draw negative pressure, and keep the pressure at 0.09Mpa for 2 hours, so that the water content reaches within 0.5%. into raw material oil, and then pumped into the raw material tank for temporary storage. This step is used to dehydrate the waste lubricating oil.

[0066] In this embodiment, the stirring time is 10 min, the standing settling temperature is 60°C, and the settling time is 2h; the vacuum dehydration temperature is 100°C.

[0067] 2) Flash degassing

[0068] The pretreated raw oil is preheated by a heat exchanger to above 140°C and enters into a flash tower, where the ...

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Abstract

The invention discloses a preparation method for regenerating base oil from waste lubrication oil. The preparation method comprises the steps of carrying out pretreatment, flash evaporation gas removal, thin-film distillation, solvent extraction, solvent-base oil separation and centrifugal decoloration refining, so as to obtain the base oil, wherein a continuous multi-stage distillation manner isadopted in the thin-film distillation step; and a distilled semi-finished product enters multi-stage tower type extraction equipment, and is adequately and uniformly mixed with an extraction agent, namely dimethyl carbonate through static and dynamic mixed gas through static and dynamic mixed gas, the mixture is subjected to repeated multi-stage extraction and then the processed mixture enters a solvent recycling system, residual solvent is separated, and finally qualified base oil product is separated by virtue of a disc centrifugal machine. According to the preparation method, the comprehensive utilization of waste lubricating oil can be realized, and a traditional clay refining process is omitted in the production process, so that the secondary pollution problem caused by the generationof waste clay during the regeneration of the waste lubrication oil is thoroughly solved, and the dangerous waste pollution is reduced; and the preparation method has the characteristics of low energyconsumption and cost, high yield, no pollution and high operating flexibility.

Description

technical field [0001] The invention relates to the technical field of base oil processing and production, in particular to a production method for regenerating base oil from waste lubricating oil. Background technique [0002] In today's increasingly scarce resources, according to the concept of the scientific concept of development, how to better realize the recycling of energy has become an urgent problem to be solved in the current world economic development. The more developed the country and the higher the degree of mechanization, the more waste lubricating oil is produced; now our country produces more than 7 million tons of waste lubricating oil every year, and it is estimated that it will exceed 10 million tons by 2020; the extensive utilization of these waste lubricating oil will not only It will cause huge waste of resources and also cause great harm to the environment. [0003] At present, the utilization rate of waste lubricating oil in my country is quite low,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M175/00
Inventor 赵敏仲赵松
Owner HEBEI JINGU RECYCLING RESOURCES DEV
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