Vegetable insulating oil refining process taking rapeseed oil as raw material

Abstract

The invention relates to a vegetable insulating oil refining process taking rapeseed oil as a raw material. The vegetable insulating oil refining process comprises the following steps: 1) selecting novel ionic liquid [thtd-Ph] Cl to carry out methyl esterification modification on rapeseed oil, and carrying out preliminary refining of degumming, washing, primary deacidification, reduced pressure distillation, normal pressure decoloration and deodorization on the rapeseed oil; 2) carrying out secondary alkali refining decolorization treatment and reduced pressure distillation on the rapeseed oilsubjected to primary refining to obtain refined rapeseed oil; 3) adding an antioxidant and an anticoagulant into the refined rapeseed oil to obtain modified rapeseed oil. The vegetable insulating oiltaking the rapeseed oil as a raw material has high flash point, low viscosity, low condensation point, low acid value and low water content, good physical and chemical properties and electrical properties, can meet the standard of transformer insulating oil, and can be widely popularized and used.

Description

technical field [0001] The invention relates to the field of vegetable insulating oil refining, in particular to a vegetable insulating oil refining process using rapeseed oil as a raw material. Background technique [0002] Vegetable insulating oil is a high ignition point, environmentally friendly liquid dielectric with good insulating properties. Common vegetable oils with higher monounsaturated fatty acid content are olive oil, rapeseed oil, soybean oil, sunflower oil, etc. Compared with olive oil with higher monounsaturated fatty acid content, rapeseed oil has a larger yield, wider sources, and is more economical. It is an ideal raw material for the preparation of vegetable insulating oil. [0003] At present, the domestic plant insulating oil refining process is still immature. The existing vegetable oil refining process is mostly aimed at the refining of edible oil. The oxidizing agent is enough, but the saponification will be produced in the process of alkali neutr...

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Problems solved by technology

[0005] (2) Higher dielectric loss: Edible oil has no requirement for dielectric loss of electrical characteristics, but transformer insulating oil has very high requirement for dielectric loss to ensure power equipment Safe operation requires that the dielectric loss of insulating oil for transformers be less than 0.5%;

[0007] Chinese patent CN102517140B discloses a multiple alkali refining process for preparing low-acid value insulating oil from vegetable oil, and specifically discloses that vegetable oil is subjected to multiple alkali refining, Until the acid value is qualified, although this method can obtain qualified vegetable insulating oil, the operation is complicated, the number of times of alkali refining is large, the operation time is long, and the loss of oil, alkali solution and soft water is large

Therefore, the processing steps of vegetable insulating oil are connected in a whole set, and it is impossible to prepare high-quality insulating oil at one time

CN201610398550.2 energy-saving natural grease insulating oil refining method, through at least two alkali refining processes to test the acid value to meet the requirement of an acid value lower than 0.03mg (KOH) / g in GB / T7599, but this patent meets the acid value Requirements, but multiple alkali refining processes lead to complicated subsequent filtration procedures, resulting in a large amount of saponins and waste water, low refining rate, and due to the easy oxidation of rapeseed oil, the acid value in rapeseed oil decreases with time will rise significantly

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