A kind of refining method of synthetic ester lubricating oil crude product

A refining method and lubricating oil technology, applied in hydrocarbon oil treatment products, only multi-stage series refining process treatment, hydrocarbon oil treatment, etc., can solve the problems of inability to meet the quality requirements of synthetic ester lubricating oil, lower electrical insulation performance of ester, Solve problems such as high metal ion content, achieve short heating time, low operating pressure and temperature, and good color

Active Publication Date: 2021-06-01
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Although this method has a good deacidification effect, it introduces foreign alkali metal impurities, which may lead to problems such as increased ash content of the product, high metal ion content, and reduced electrical insulation performance of the ester; Emulsification, which leads to high fatty acid consumption and low ester yield
[0004] Vacuum distillation is also used for refining crude ester products. This method removes non-ideal components such as free fatty acids and acidic catalysts in crude ester products through low-vacuum vacuum distillation. Although it is simple and easy, the removal efficiency Low, unable to meet the relevant quality requirements of synthetic ester lubricating oil
In addition, vacuum distillation can be further combined with alkali elution acid, although it can improve the deacidification effect, but also cannot solve the above-mentioned existing problems
[0005] In recent years, there are also related reports on the use of solid adsorption deacidification and decolorization methods. This method uses decolorization agents to adsorb and decolorize while also using deacidification agents to adsorb and deacidify. Although it has a certain effect, the acid value is limited, and the ester yield relatively low

Method used

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  • A kind of refining method of synthetic ester lubricating oil crude product

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this example, the esterification product generated by the esterification reaction of pentaerythritol and isooctanoic acid in the presence of a catalyst is used as the raw material for the crude product of synthetic ester lubricating oil, and its acid value is 12.01 mgKOH / g, which is stored in the crude ester storage tank 1; crude ester refining method process such as figure 1 As shown, the refining steps are as follows:

[0038] 1. First molecular distillation

[0039] The synthetic ester lubricating oil crude product in the crude ester storage tank 1 is pumped into the first-stage molecular distillation equipment 2 for the first molecular distillation, wherein the distillation temperature of the first molecular distillation is controlled to be 170°C, and the condensation temperature is 30°C. The pressure is 7.4 Pa, thereby removing most of the isooctanoic acid and the catalyst (ie R1) in the raw material of the crude synthetic ester lubricating oil, and obtaining t...

Embodiment 2

[0050] In this example, the esterification product generated by the esterification reaction of pentaerythritol and isooctanoic acid in the presence of a catalyst is used as the raw material for the crude product of synthetic ester lubricating oil, and its acid value is 12.01 mgKOH / g, which is stored in the crude ester storage tank 1; crude ester refining method process such as figure 1 As shown, the refining steps are as follows:

[0051] 1. First molecular distillation

[0052] Pump the crude synthetic ester lubricating oil in the crude ester storage tank 1 into the first-stage molecular distillation equipment 2 for the first molecular distillation, wherein the distillation temperature of the first molecular distillation is controlled to be 175°C, and the condensation temperature is 30°C. The pressure is 7.4 Pa, thereby removing most of the isooctanoic acid and the catalyst (ie R1) in the raw material of the crude synthetic ester lubricating oil, and obtaining the deacidifie...

Embodiment 3

[0063] In this example, the esterification product generated by the esterification reaction of pentaerythritol and isooctanoic acid in the presence of a catalyst is used as the raw material for the crude product of synthetic ester lubricating oil, and its acid value is 12.01 mgKOH / g, which is stored in the crude ester storage tank 1; crude ester refining method process such as figure 1 As shown, the refining steps are as follows:

[0064] 1. First molecular distillation

[0065] The crude synthetic ester lubricating oil in the crude ester storage tank 1 is added to the first-stage molecular distillation equipment 2 to carry out the first molecular distillation, wherein the distillation temperature of the first molecular distillation is controlled to be 180°C, and the condensation temperature is 30°C. The pressure is 10 Pa, thereby removing most of the isooctanoic acid and the catalyst (ie R1) in the raw material of the crude synthetic ester lubricating oil, and obtaining the ...

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Abstract

The invention provides a method for refining crude synthetic ester lubricating oil. The refining method of the synthetic ester lubricating oil crude product of the present invention comprises the following steps: 1) sequentially performing first molecular distillation and second molecular distillation on the synthetic ester lubricating oil crude product; third molecular distillation; 3) performing nitrogen stripping on the light components formed by the third molecular distillation to obtain synthetic ester lubricating oil. The refining method of the invention has the advantages of high production efficiency, low refining cost, and environmental protection. The synthetic ester lubricating oil refined by the method is close to colorless, its acid value and water content meet relevant requirements, and the ester yield is high.

Description

technical field [0001] The invention belongs to the technical field of synthetic ester lubricating oil, in particular to a method for refining crude synthetic ester lubricating oil. Background technique [0002] Compared with traditional mineral lubricating oil, synthetic ester lubricating oil has excellent viscosity-temperature performance, good thermal stability, low volatility, biodegradable, miscible with mineral oil and most other synthetic oils, wear resistance and Good friction resistance, environmental friendliness and other characteristics, so it is widely used in the fields of aircraft turbine engine lubricating oil, precision instrumentation oil, synthetic compressor oil and refrigerating machine oil. [0003] Synthetic ester lubricating oil is usually formed by the reaction of alcohol and organic acid at elevated temperature under the action of acid catalysis. The low esterification rate of the reaction and the residue of acidic catalyst will increase the difficu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/02
CPCC10G53/02C10G2300/1062C10G2400/10
Inventor 甄新平朱建华张永泽李磊马玲
Owner PETROCHINA CO LTD
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