Preparation method of insulating oil taking vegetable oil as raw material

Abstract

The invention provides a preparation method of insulating oil taking vegetable oil as raw material, which comprises the following steps of: 1) neutralizing the vegetable oil with alkali; 2) conducting reduced pressure distillation on the vegetable oil after being neutralized with alkali; 3) hydrogenating the vegetable oil after the reduced pressure distillation; 4) conducting deep refinement to the hydrogenated vegetable oil: adding citric acid which accounts for 0.3 to 1.0 percent of the weight of the vegetable oil to the hydrogenated vegetable oil, conducting reduced pressure distillation for 1 to 2 hours at the pressure of 20 to 50 mmHg and the temperature of 80 to 90 DEG C; and then adding bentonite which accounts for 0.1 to 0.3 percent of the weight of the vegetable oil, conducting reduced pressure distillation for 1 to 2 hours at the pressure of 20 to 50 mmHg and the temperature of 80 to 90 DEG C; 5) conducting reduced pressure distillation again to the vegetable oil after the deep refinement; and 6) adding an additive to the vegetable oil being treated with the reduced pressure distillation again.

Description

technical field

[0001] The invention relates to a preparation method of insulating oil using vegetable oil as raw material. Background technique

[0002] Insulating oil is an important liquid insulating medium, which is widely used in electrical equipment such as transformers. Mineral insulating oil is widely used in the manufacture of electrical equipment due to its low cost, good insulation performance and cooling performance. However, the biodegradability of mineral insulating oil is poor. Once a serious leakage occurs, it will cause serious pollution to the surrounding soil, water sources and even public communities; moreover, mineral insulating oil has a low ignition point, poor high temperature resistance and fire resistance, and is not suitable for use in mines and mines. , military facilities, high-rise buildings and other places with high fire safety requirements; at the same time, natural oil reserves are limited, and it is expected that there will be a serious oi...

Examples

Embodiment 1

[0032] 1) Select transgenic rapeseed oil and camellia seed oil with high oleic acid content as raw materials to carry out alkali neutralization and decolorization of vegetable oil, specifically including the following steps:

[0033] 11) Within 10 minutes, add a NaOH solution at the same temperature as the oil, accounting for 1% of the weight of the vegetable oil, for alkali neutralization. After 30 minutes, wash the vegetable oil with distilled water at the same temperature, and then let it stand for stratification to separate the fatty acids Neutralize the product sodium fatty acid with sodium hydroxide, then let it stand for more than 30 minutes, then distill the oil sample for 30 minutes with a vacuum distillation device, stop heating, and release the vacuum;

[0034] 12) Add a decolorizing agent accounting for 2.0% of the weight of the vegetable oil to the alkali-neutralized vegetable oil; decompress and heat, the residual pressure in the container is 35mmHg, the oil tempe...

Embodiment 2

[0042] 1) select olive oil as raw material, and carry out alkali neutralization and decolorization of vegetable oil, specifically comprising the following steps:

[0043] 11) Within 5 minutes, add a NaOH solution at the same temperature as the oil and account for 4% of the weight of the vegetable oil for alkali neutralization. After 30 minutes, wash the vegetable oil with distilled water at the same temperature, and then let it stand for stratification to separate the fatty acids Neutralize the product sodium fatty acid with sodium hydroxide, then let it stand for more than 30 minutes, then distill the oil sample for 30 minutes with a vacuum distillation device, stop heating, and release the vacuum;

[0044] 12) Add a decolorizing agent accounting for 5% of the weight of the vegetable oil to the alkali-neutralized vegetable oil; decompress and heat, the residual pressure in the container is 50mmHg, the oil temperature is 95°C, and the decolorization time is 30min. After the dec...

Embodiment 3

[0052] 1) Select soybean oil as a raw material to carry out alkali neutralization and decolorization of vegetable oil, specifically including the following steps:

[0053] 11) Within 8 minutes, add a NaOH solution at the same temperature as the oil and account for 3% of the weight of the vegetable oil for alkali neutralization. After 30 minutes, wash the vegetable oil with distilled water at the same temperature, then let it stand for stratification, and separate the fatty acids Neutralize the product sodium fatty acid with sodium hydroxide, then let it stand for more than 30 minutes, then distill the oil sample for 30 minutes with a vacuum distillation device, stop heating, and release the vacuum;

[0054] 12) Add a decolorizing agent accounting for 3.5% of the weight of the vegetable oil to the alkali-neutralized vegetable oil; decompress and heat, the residual pressure in the container is 20mmHg, the oil temperature is 93°C, and the decolorization time is 25min. After the de...

technical field

[0001] The invention relates to a preparation method of insulating oil using vegetable oil as raw material. Background technique

[0002] Insulating oil is an important liquid insulating medium, which is widely used in electrical equipment such as transformers. Mineral insulating oil is widely used in the manufacture of electrical equipment due to its low cost, good insulation performance and cooling performance. However, the biodegradability of mineral insulating oil is poor. Once a serious leakage occurs, it will cause serious pollution to the surrounding soil, water sources and even public communities; moreover, mineral insulating oil has a low ignition point, poor high temperature resistance and fire resistance, and is not suitable for use in mines and mines. , military facilities, high-rise buildings and other places with high fire safety requirements; at the same time, natural oil reserves are limited, and it is expected that there will be a serious oi...

Examples

Embodiment 1

[0032] 1) Select transgenic rapeseed oil and camellia seed oil with high oleic acid content as raw materials to carry out alkali neutralization and decolorization of vegetable oil, specifically including the following steps:

[0033] 11) Within 10 minutes, add a NaOH solution at the same temperature as the oil, accounting for 1% of the weight of the vegetable oil, for alkali neutralization. After 30 minutes, wash the vegetable oil with distilled water at the same temperature, and then let it stand for stratification to separate the fatty acids Neutralize the product sodium fatty acid with sodium hydroxide, then let it stand for more than 30 minutes, then distill the oil sample for 30 minutes with a vacuum distillation device, stop heating, and release the vacuum;

[0034] 12) Add a decolorizing agent accounting for 2.0% of the weight of the vegetable oil to the alkali-neutralized vegetable oil; decompress and heat, the residual pressure in the container is 35mmHg, the oil tempe...

Embodiment 2

[0042] 1) select olive oil as raw material, and carry out alkali neutralization and decolorization of vegetable oil, specifically comprising the following steps:

[0043] 11) Within 5 minutes, add a NaOH solution at the same temperature as the oil and account for 4% of the weight of the vegetable oil for alkali neutralization. After 30 minutes, wash the vegetable oil with distilled water at the same temperature, and then let it stand for stratification to separate the fatty acids Neutralize the product sodium fatty acid with sodium hydroxide, then let it stand for more than 30 minutes, then distill the oil sample for 30 minutes with a vacuum distillation device, stop heating, and release the vacuum;

[0044] 12) Add a decolorizing agent accounting for 5% of the weight of the vegetable oil to the alkali-neutralized vegetable oil; decompress and heat, the residual pressure in the container is 50mmHg, the oil temperature is 95°C, and the decolorization time is 30min. After the dec...

Embodiment 3

[0052] 1) Select soybean oil as a raw material to carry out alkali neutralization and decolorization of vegetable oil, specifically including the following steps:

[0053] 11) Within 8 minutes, add a NaOH solution at the same temperature as the oil and account for 3% of the weight of the vegetable oil for alkali neutralization. After 30 minutes, wash the vegetable oil with distilled water at the same temperature, then let it stand for stratification, and separate the fatty acids Neutralize the product sodium fatty acid with sodium hydroxide, then let it stand for more than 30 minutes, then distill the oil sample for 30 minutes with a vacuum distillation device, stop heating, and release the vacuum;

[0054] 12) Add a decolorizing agent accounting for 3.5% of the weight of the vegetable oil to the alkali-neutralized vegetable oil; decompress and heat, the residual pressure in the container is 20mmHg, the oil temperature is 93°C, and the decolorization time is 25min. After the de...