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Recovery treatment method of waste lubrication oil

A technology for recycling waste lubricating oil, applied in lubricating compositions, petroleum industry, etc., can solve the problems of inability to dispose of highly oxidatively deteriorated acid value waste lubricating oil, secondary pollution of the environment, complicated process, etc., and achieve good industrialization development prospects , low equipment requirements, and the effect of increasing membrane flux

Inactive Publication Date: 2016-07-20
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The early sulfuric acid-clay method, although this process can produce qualified base oil, but the acid residue caused serious secondary pollution to the environment; the solvent refining process does not use sulfuric acid, with little pollution and high yield, but it is selective for waste lubricating oil It is difficult to choose a good solvent, and the solvent needs to be recycled, and the process is more complicated; the quality of the oil recovered by the short-path distillation process and the supercritical extraction process is good, but there are certain limitations on the requirements for the regeneration of waste lubricating oil, such as the inability to dispose of highly oxidative deterioration , waste lubricating oil with severe emulsification and high acid value
[0004] In recent years, the membrane separation process has been widely used in waste lubricating oil. This process has the characteristics of simple operation, miniaturization of equipment, low operating conditions, high separation efficiency, low energy consumption, and environmental friendliness. However, the membrane flux Small, membrane fouling technical problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for recycling waste lubricating oil, comprising the following steps:

[0022] (1) Add a flocculant to the waste lubricating oil, control the stirring speed to 1200 / min, stir at 40°C for 20 minutes, then control the rotating speed to 6000r / min and centrifuge for 15 minutes, and collect the obtained upper oil liquid 1;

[0023] The mass ratio of the add-on of described flocculant and waste lubricating oil is 15:100;

[0024] The flocculant is a mixture of potassium hydroxide aqueous solution with a mass ratio concentration of 15% and a polyacrylamide aqueous solution with a mass percent concentration of 1.0%, and a mass percent concentration of 15% potassium hydroxide aqueous solution and a mass percent concentration of 0.5% The mass ratio of % polyacrylamide aqueous solution is 15:10;

[0025] The molecular weight of polyacrylamide in polyacrylamide aqueous solution is 71.07;

[0026] (2) Perform membrane separation on the upper oil liquid 1 obtained in step (...

Embodiment 2

[0036] A method for recycling waste lubricating oil, comprising the following steps:

[0037] (1) Add a flocculant to the waste lubricating oil, control the stirring speed to 1000r / min, stir at a temperature of 35°C for 15min, then control the rotational speed to 5500r / min and centrifuge for 10min, and collect the obtained upper layer oil 1;

[0038] The mass ratio of flocculant used in step (1) and waste lubricating oil used is 10:100;

[0039] The flocculant is a mixture of potassium hydroxide aqueous solution with a mass ratio concentration of 12% and a polyacrylamide aqueous solution with a mass percent concentration of 0.5%, and a mass percent concentration of 15% potassium hydroxide aqueous solution and a mass percent concentration of 1.0% The mass ratio of % polyacrylamide aqueous solution is 20:15;

[0040] The molecular weight of polyacrylamide in polyacrylamide aqueous solution is 71.07;

[0041] (2) Perform membrane separation on the upper oil liquid 1 obtained in...

Embodiment 3

[0051] A method for recycling waste lubricating oil, comprising the following steps:

[0052] (1) Add a flocculant to the waste lubricating oil, control the stirring speed to 1500 / min, stir at 45°C for 30 minutes, then control the rotating speed to 6500r / min and centrifuge for 20 minutes, and collect the obtained upper layer oil 1;

[0053] The addition amount of described flocculant is calculated according to the mass ratio of flocculant: waste lubricating oil used in step (1), i.e. flocculant: waste lubricating oil used in step (1) is 20:100;

[0054] The flocculant is a mixture of an aqueous potassium hydroxide solution with a mass ratio concentration of 18% and a polyacrylamide aqueous solution with a mass percentage concentration of 1.5%. Calculated by mass ratio, the potassium hydroxide aqueous solution with a mass percentage concentration of 15%: The polyacrylamide aqueous solution with a mass percentage concentration of 1.5% is 25:20;

[0055] The molecular weight of ...

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Abstract

The invention discloses a recovery treatment method of waste lubrication oil.The recovery treatment method includes the steps that firstly, a flocculant is added into the waste lubrication oil, stirring is performed, centrifugal separation is performed, and upper-layer oil is collected; then, the upper-layer oil is subjected to membrane separation, and lower-layer oil is collected; finally, an adsorbent is added into the lower-layer oil, stirring is performed, centrifugal separation is performed, upper-layer oil is taken, and thus recovery of the waste lubrication oil is completed.The recovery treatment method of the waste lubrication oil is simple, easy to implement, low in regeneration cost and environmentally friendly, base oil of the recovered waste lubrication oil is high in quality and meets the requirement for performance indexes of base oil in the HVI S150 standard, and good development prospects are achieved.

Description

technical field [0001] The invention relates to a recovery and treatment method of waste lubricating oil, which belongs to the technical field of petrochemical industry. Background technique [0002] In today's world, oil resources are increasingly scarce, and waste oil regeneration has become a strategic issue for the development of circular economy. At present, China actually consumes 6×10 lubricating oil every year 6 more than t, more than 90% of which can be recycled, and the regeneration potential of waste oil is huge. [0003] There are currently dozens of disposal processes for the recycling of waste lubricating oil. The early sulfuric acid-clay method, although this process can produce qualified base oil, but the acid residue caused serious secondary pollution to the environment; the solvent refining process does not use sulfuric acid, with little pollution and high yield, but it is selective for waste lubricating oil It is difficult to choose a good solvent, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M175/06
CPCC10M175/0008C10M175/0083C10M175/06C10N2020/017C10N2020/02
Inventor 蔺华林兰国贤韩生马鹏韦焕明周嘉伟刘平冯晨萁刘金宝余伟萍
Owner SHANGHAI INST OF TECH
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