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Method for preparing electric insulation oil from gutter oil

A technology for waste oil and insulating oil, which is applied in the field of electrical insulating materials, can solve the problems of increasing process complexity, reducing ignition point, flash point, and low yield, and achieves reduction in entering the food chain, reducing acid value, and high recycling rate. Effect

Inactive Publication Date: 2018-08-03
武汉泽电新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, direct low-temperature dewaxing of waste oil without pretreatment not only consumes a lot of energy, but also has a low yield. There is still a large amount of waste oil that can be reused in the wax crystals, but it is crystallized in advance due to impurities and other reasons. If degumming, impurity removal, deacidification and other treatments are carried out first, the freezing point can actually be improved
Moreover, the high wax point ester is subjected to esterification reaction and then mixed with flowable oil, which increases the complexity of the process, and the esterification reaction involves technical problems such as the recovery and utilization of catalysts and alcohols, and the reduction of ignition point and flash point.

Method used

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  • Method for preparing electric insulation oil from gutter oil
  • Method for preparing electric insulation oil from gutter oil
  • Method for preparing electric insulation oil from gutter oil

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Comparison scheme
Effect test

Embodiment 1

[0058] The invention provides a kind of waste oil preparation method for electric insulating oil, comprises the waste oil that is recovered through static sedimentation, floating matter skimming and rough grade filtration treatment, obtains rough grade waste oil, such as figure 1 As shown, the method also includes:

[0059] Step 1, joint degumming, including firstly preheating the crude waste oil to 65°C-75°C, adding phosphoric acid or citric acid whose mass is 0.05%-0.3% of the oil weight, stirring for 20-60 minutes and then cooling to 35 ~ 45°C; then add NaOH solution with a mass of 3% to 8% of oil weight and a concentration of 3% to 6%, stir for 20 to 60 minutes, heat to 65°C to 75°C and let it settle, release the lower layer solution, add 70 ℃~80℃, wash with soft water whose mass is 3%~8% of oil weight for 20~30min, and distill and dehydrate under reduced pressure; obtain degummed oil.

[0060] Step 2, decolorization and impurity removal, including adding activated clay o...

Embodiment 2

[0071] The combination of refined parameter values ​​given in the embodiments of the present invention belongs to a mode of moderation in each embodiment of the present invention, and its parameters such as ignition point / °C, power frequency breakdown voltage / kV, dielectric loss / %, pour point / °C, acid The performance parameters of mgKOH / g and kinematic viscosity (40°C) / (mm2 / s) all belong to the middle category, and the insulating oil obtained is suitable for more conventional demand fields. Specifically, based on the implementation of the method of each step in embodiment 1, the corresponding performance in the embodiment of the present invention is as follows:

[0072] In the first step, firstly, after preheating the crude waste oil to 65°C, add phosphoric acid whose mass is 0.2% of the oil weight, stir and react for 30 minutes, and then cool to 35°C; 4% NaOH solution, stirred and reacted for 30 minutes, heated to 70°C and allowed to stand for precipitation, released the lowe...

Embodiment 3

[0079] The combination of refined parameter values ​​given by the embodiments of the present invention belongs to a mode in which the characteristics of the embodiments of the present invention are weaker, such as ignition point / °C, power frequency breakdown voltage / kV, dielectric loss / %, pour point / °C, acid value mgKOH / g and kinematic viscosity (40 °C) / (mm2 / s), the performance is the worst in terms of ignition point and power frequency breakdown voltage, and the insulating oil obtained is suitable for controlling ignition point and industrial frequency Fields with low frequency breakdown voltage requirements. Specifically, based on the implementation of the method of each step in embodiment 1, the corresponding performance in the embodiment of the present invention is as follows:

[0080] In the first step, after preheating the crude waste oil to 75°C, add phosphoric acid with a mass of 0.1% of the oil weight and stir for 20 minutes, then cool to 40°C; 4% NaOH solution, sti...

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Abstract

The invention relates to the technical field of recycling of renewable resources, oil processing and electric insulation materials and provides a method for preparing electric insulation oil from gutter oil. The method comprises steps as follows: S1, combined degumming; S2, decoloration and impurity removal; S3, vacuum steam stripping; S4, compounding and alkali refining; S5, water washing and soap removal; S6, dry fractionation. According to the combined degumming technology, hydratable phospholipids and non-hydratable phospholipids can be effectively removed simultaneously, the degumming efficiency is high, the settling effect is good, and the refining effect of the following process is facilitated; through cooperation of vacuum steam stripping with compounding and alkali refining, the acid value of oil can be substantially reduced; through dry fractionation, the condensation point of oil can be further reduced according to specific demands.

Description

【Technical field】 [0001] The invention relates to the technical fields of recycling of renewable resources, oil processing and electric insulating materials, in particular to a method for preparing electric insulating oil from waste oil. 【Background technique】 [0002] Waste oil refers to non-edible oils of extremely poor quality, and also includes oils discarded after repeated frying and frying, and non-edible oils produced after oily wastewater is separated by oil-water separators or grease traps. Conceptually, it belongs to the category of kitchen waste. Therefore, the management and treatment of waste oil is urgent, and it is urgent to find reasonable waste oil utilization measures to promote the development of food safety and ensure the health of human life. [0003] As a liquid insulating medium, insulating oil is an important insulating material in oil-filled electrical equipment. Mineral insulating oil is widely used in oil-insulated high-voltage equipment because o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B13/00
CPCC11B13/00Y02W30/74
Inventor 周竹君胡婷
Owner 武汉泽电新材料有限公司
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