Lubricating oil cleaning agent and cleaning method

Abstract

The invention belongs to the technical field of lubricating oil cleaning treatment, and discloses a lubricating oil cleaning agent and a cleaning method. The invention relates to a lubricating oil cleaning agent, which is prepared from the following components in percentage by mass: 0.5 to 2.5 percent of di-tert-butyl peroxide and 0.2 to 1.5 percent of disodium ethylene diamine tetraacetate. The cleaning method comprises the following cleaning steps: (1) adding di-tert-butyl peroxide and disodium ethylene diamine tetraacetate into lubricating oil to be cleaned according to the mass percent, and uniformly stirring at room temperature; (2) carrying out closed stirring reaction on the mixed system obtained in the step (1) at the constant temperature of 80-100 DEG C for 4-6 hours; and (3) after the reaction in the step (2) is finished, cooling a reaction system to room temperature, carrying out vacuum suction filtration, and collecting liquid obtained after suction filtration, namely the cleaned lubricating oil. The lubricating oil is cleaned through the oxidation reaction of the di-tert-butyl peroxide and the organic impurities and the chelation reaction of the ethylenediamine tetraacetic acid disodium salt and the metal ions, and the cleaning effect is remarkable.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of lubricating oil cleaning treatment, and particularly relates to a lubricating oil cleaner and a cleaning method. BACKGROUND

[0002] During the use of lubricating oil, affected by factors such as equipment friction and wear, high-temperature oxidation, carbon deposition, paint film and other organic impurities and metal ion impurities formed by the dissolution of metal scraps are easily generated. These impurities can cause the increase of the viscosity of lubricating oil, the decrease of flowability, the reduction of lubricating effect, the acceleration of equipment wear, and even the triggering of equipment failure.

[0003] In the existing lubricating oil cleaning technology, although the physical filtration method can remove part of solid particle impurities, the removal effect of carbon deposition, paint film and other viscous organic impurities and metal ions is limited. The traditional chemical cleaning method mostly uses strong acid and strong alkali reagents, which can decompose organic impurities, but can easily corrode equipment parts and destroy the basic components of lubricating oil, resulting in the deterioration of lubricating oil performance and the inability to reuse. In addition, part of the chemical cleaning process has harsh reaction conditions, requires high-temperature and high-pressure environment, and has high equipment investment cost, which is difficult to popularize and apply in the conventional lubricating oil maintenance scene. SUMMARY

[0004] In view of the deficiencies existing in the existing lubricating oil cleaning technology, the purpose of the present application is to provide a lubricating oil cleaner and a cleaning method.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] A lubricating oil cleaner, consisting of 0.5-2.5% of di-tert-butyl peroxide and 0.2-1.5% of disodium ethylenediaminetetraacetate, in terms of the mass percentage of the lubricating oil to be cleaned.

[0007] Preferably, when the content of organic impurities in the lubricating oil to be cleaned is >5wt%, the cleaner consists of 1.0-2.5% of di-tert-butyl peroxide and 0.8-1.5% of disodium ethylenediaminetetraacetate, but di-tert-butyl peroxide does not contain 1.0% and disodium ethylenediaminetetraacetate does not contain 0.8%.

[0008] Preferably, when the content of organic impurities in the lubricating oil to be cleaned is ≤5wt%, the cleaner consists of 0.5-1.0% of di-tert-butyl peroxide and 0.2-0.8% of disodium ethylenediaminetetraacetate.

[0009] Preferably, the organic impurities are one or a combination of carbon deposition and paint film.

[0010] A method for cleaning lubricating oil by using the lubricating oil cleaner, the cleaning steps are as follows:

[0011] (1), mixing stage: according to the mass percentage, di-t-butyl peroxide and ethylenediaminetetraacetic acid disodium salt are added to the lubricating oil to be cleaned, and stirred uniformly at room temperature;

[0012] (2), reaction stage: the mixed system obtained in step (1) is stirred at 80~100℃ constant temperature for 4~6h;

[0013] (3), impurity separation stage: after the reaction in step (2) is completed, the reaction system is cooled to room temperature, vacuum filtration is carried out, and the liquid obtained after filtration is collected, which is the cleaned lubricating oil.

[0014] Preferably, in step (1), the stirring rate is 300~500rpm, and the stirring time is 30~60min.

[0015] Preferably, in step (2), the stirring rate is 200~300rpm.

[0016] Preferably, in step (1) and step (3), the room temperature is 25±5℃.

[0017] Preferably, in step (3), when vacuum filtration is carried out, glass fiber filter paper with a pore size of 0.5~1μm is used as the filtration medium, and the flow rate of the reaction system is controlled at 50~100mL / min.

[0018] The mechanism of action of the cleaning agent of the present application: di-t-butyl peroxide, as a strong oxidizing additive, can slowly decompose to produce t-butoxy radicals in the range of room temperature to 100℃ , which have strong oxidizing properties and can oxidize and break the carbon-carbon bond and carbon-hydrogen bond in the carbon and organic impurities in the paint film, decomposing the macromolecular organic impurities into small molecular alcohols, ketones, carboxylic acids and other substances that can be dissolved in lubricating oil, and then further decomposing into volatile substances such as carbon dioxide and water, thereby achieving the removal of organic impurities; ethylenediaminetetraacetic acid disodium salt (EDTA-2Na), as a metal chelating agent, has multiple amino groups and carboxyl groups in its molecular structure, which can form stable six-membered ring chelates with Fe 2+ , Cu 2+ , Al 3+ and other metal ions in the lubricating oil, which have good water solubility and stability, avoiding the catalysis of metal ions to further oxidize the lubricating oil, and can be separated from the lubricating oil through the subsequent filtration step to prevent the deposition of metal ions on the surface of the equipment to form abrasive particles. In summary, the present application selects chemical additives with specific functions to react with impurities in the lubricating oil, converting difficult-to-remove impurities into easily separable substances, achieving efficient self-cleaning of the lubricating oil.

[0019] The cleaning agent and the cleaning method thereof are suitable for cleaning automobile engine lubricating oil, industrial gear box lubricating oil, ship power system lubricating oil and the like.

[0020] Beneficial effects:

[0021] (1) Significant cleaning effect: through the oxidation reaction of di-tert-butyl peroxide and organic impurities and the chelation reaction of disodium ethylenediaminetetraacetate and metal ions, the removal rate of carbon deposition and paint film is greater than 96%, the kinematic viscosity of the lubricating oil is restored to 105-107% of that of new oil, and the lubricating performance is effectively restored;

[0022] (2) Mild and safe process: the reaction temperature is controlled at 80-100℃, high temperature and high pressure conditions are not required, the equipment investment cost is low, the cleaning agent is mild peroxide and chelating agent, which does not corrode equipment parts and does not damage the base oil composition of the lubricating oil, and the treated lubricating oil can be reused;

[0023] (3) Simple operation and easy popularization: the entire cleaning process only includes three links of mixing, reaction and filtration, the operation process is simple, the required equipment (stirrer, reaction kettle and vacuum filtration device) is conventional chemical equipment, and the existing lubricating oil maintenance site can be directly deployed, and the popularization and application cost is low;

[0024] (4) Outstanding economic benefits: the treated lubricating oil can prolong the service life and reduce the amount of new oil purchase; at the same time, the failure maintenance cost of equipment caused by impurities is reduced, and the operation and maintenance cost of enterprises is saved. DETAILED DESCRIPTION

[0025] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described below in combination with specific examples. Obviously, the described examples are part of the examples of the present application, rather than all the examples. Based on the described examples, all other examples obtained by those skilled in the art without creative labor belong to the protection scope of the present application.

[0026] Example 1 - cleaning treatment of waste lubricating oil of automobile engine

[0027] The lubricating oil used in a certain automobile engine is purchased initially (at this time, the lubricating oil is referred to as new oil), and the detection shows that the kinematic viscosity (40℃) thereof is 30mm 2 / s, after being used for a period of time, the detection shows that the kinematic viscosity (40℃) thereof is 50mm 2 / s, the total amount of carbon deposition and paint film impurities accounts for 6wt%, Fe 2+ concentration is 80ppm, and Cu 2+ concentration is 25ppm; the waste lubricating oil is subjected to cleaning treatment, and the steps are as follows:

[0028] (1) Mixing stage: 1.2% of di-tert-butyl peroxide and 1.0% of disodium ethylenediaminetetraacetate were added into the waste lubricating oil to be cleaned, accounting for 1.2% and 1.0% of the mass percentage of the waste lubricating oil to be cleaned, and placed in a container with a mechanical stirring device, stirred at 25°C and 400 rpm for 45 min;

[0029] (2) Reaction stage: the mixed system obtained in step (1) was transferred to a pressure-resistant reaction kettle with a heating system, temperature control device and stirring device, the reaction kettle was closed, the heating system was turned on, the temperature of the system was raised to 90°C and kept constant, and the stirring device was turned on at a speed of 250 rpm to stir the reaction for 5 h;

[0030] (3) Impurity separation stage: after the reaction in step (2) was completed, the heating system was turned off, the reaction system in the reaction kettle was cooled to 25°C, a glass fiber filter paper with a pore size of 0.8 μm was used as a medium, a vacuum filtration device was built, the cooled reaction system was slowly poured into the filtration funnel at a flow rate of 80 mL / min, the vacuum pump was turned on, and the negative pressure was used to accelerate the reaction system through the filter paper. The insoluble impurities such as unreacted cleaning agent residue and chelate precipitate were intercepted on the filter paper, and the filtered liquid was collected in a clean container, which was the cleaned lubricating oil.

[0031] The cleaned lubricating oil was detected, the kinematic viscosity of the lubricating oil was detected by capillary viscometer method, and the metal ion concentration was detected by inductively coupled plasma optical emission spectrometer (ICP-OES). The detection results showed that the kinematic viscosity (40°C) of the lubricating oil was reduced to 32 mm 2 / s (restored to 106.7% of new oil), the total amount of carbon and paint film impurities was reduced to 0.2wt%, the Fe 2+ concentration was reduced to 3 ppm, the Cu 2+ concentration was reduced to 0.5 ppm, and the cleanliness met the requirements of automobile engine lubricating oil, which could be reused in the engine.

[0032] Example 2 - Cleaning treatment of industrial gear box waste lubricating oil

[0033] The waste lubricating oil used in the gear box of a factory was purchased initially (at this time, the lubricating oil was referred to as new oil), and the detection showed that the kinematic viscosity (40°C) was 40 mm 2 / s, after a period of use, the detection showed that the kinematic viscosity (40°C) was 65 mm 2 / s, the total amount of carbon and paint film impurities was 2.0wt%, the Al 3+ concentration was 30 ppm; the waste lubricating oil was cleaned, and the steps were as follows:

[0034] (1) Mixing stage: 0.8% of di-tert-butyl peroxide and 0.4% of ethylenediaminetetraacetic acid disodium salt were added into the waste lubricating oil to be cleaned, accounting for 0.8% and 0.4% of the mass percentage of the waste lubricating oil to be cleaned, and placed in a container with a mechanical stirring device, stirred at 23°C and 350 rpm for 30 min;

[0035] (2) Reaction stage: the mixed system obtained in step (1) was transferred to a pressure-resistant reaction kettle with a heating system, temperature control device and stirring device, the reaction kettle was closed, the heating system was turned on, the temperature of the system was raised to 85°C and kept constant, at the same time, the stirring device was turned on, and the reaction was stirred at a speed of 200 rpm for 5 h;

[0036] (3) Impurity separation stage: after the reaction in step (2) was completed, the heating system was turned off, the reaction system in the reaction kettle was cooled to 23°C, a glass fiber filter paper with a pore size of 0.5 μm was used as a medium, a vacuum filtration device was built, the cooled reaction system was slowly poured into the filtration funnel at a flow rate of 60 mL / min, the vacuum pump was turned on, and the negative pressure was used to accelerate the reaction system through the filter paper, the insoluble impurities such as unreacted cleaning agent residue and chelate precipitate were intercepted on the filter paper, and the filtered liquid was collected in a clean container, which was the cleaned lubricating oil.

[0037] The cleaned lubricating oil was detected, the capillary viscometer method was used to detect the kinematic viscosity of the lubricating oil, and the inductively coupled plasma optical emission spectrometer (ICP-OES) was used to detect the metal ion concentration, and the detection results showed that the kinematic viscosity of the lubricating oil (40°C) was reduced to 42 mm 2 / s (restored to 105% of new oil), the total amount of carbon and paint film impurities was reduced to 0.005wt%, the Al 3+ concentration was reduced to 2 ppm, and the cleanliness met the industrial gear box lubricating oil use standard.

Claims

1. A lubricating oil cleaner characterized by comprising: The cleaner consists of 0.5-2.5% di-tert-butyl peroxide and 0.2-1.5% disodium ethylenediaminetetraacetate by mass percentage of the lubricating oil to be cleaned.

2. The lubricating oil detergent of claim 1 wherein: When the content of organic impurities in the lubricating oil to be cleaned is >5wt%, the cleaner consists of 1.0-2.5% di-tert-butyl peroxide and 0.8-1.5% disodium ethylenediaminetetraacetate, but di-tert-butyl peroxide does not contain 1.0% and disodium ethylenediaminetetraacetate does not contain 0.8%.

3. The lubricating oil detergent of claim 1 wherein: When the content of organic impurities in the lubricating oil to be cleaned is ≤5wt%, the cleaner consists of 0.5-1.0% di-tert-butyl peroxide and 0.2-0.8% disodium ethylenediaminetetraacetate.

4. The lubricating oil detergent of claim 2 or 3 wherein: The organic impurities are one or a combination of carbon deposition and paint film.

5. A method for cleaning lubricating oil with the lubricating oil cleaner according to any one of claims 1 to 3, characterized by, The cleaning steps are as follows: (1) mixing stage: di-tert-butyl peroxide and disodium ethylenediaminetetraacetate are added to the lubricating oil to be cleaned in the mass percentage, and stirred uniformly at room temperature; (2) reaction stage: the mixed system obtained in step (1) is stirred at 80-100°C for 4-6h in a constant temperature and closed state; (3) impurity separation stage: after the reaction in step (2) is completed, the reaction system is cooled to room temperature, vacuum filtration is performed, and the liquid obtained after filtration is collected, which is the lubricating oil after cleaning.

6. The method of cleaning lubricating oil with the lubricating oil cleaner according to claim 5, characterized by: In step (1), the stirring rate is 300-500rpm and the stirring time is 30-60min.

7. The method of cleaning lubricating oil with the lubricating oil cleaner according to claim 5, characterized by: In step (2), the stirring rate is 200-300rpm.

8. The method of cleaning lubricating oil with the lubricating oil cleaner according to claim 5, characterized by: In step (1) and step (3), the room temperature is 25±5°C.

9. The method of cleaning lubricating oil with the lubricating oil cleaner according to claim 5, characterized by: In step (3), when vacuum filtration is performed, glass fiber filter paper with a pore size of 0.5-1μm is used as the filtration medium, and the flow rate of the reaction system is controlled at 50-100mL / min.