Mixed Ester Insulating Oil Preparation Process
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Solution Overview
Problem
Existing methods for preparing synthetic ester insulating oil face challenges such as high production costs, complex processes, and environmental concerns due to the use of hazardous catalysts and raw materials, as well as limitations in flash point and dielectric loss factor.
Innovation Solution
A method and system for preparing multi-compound ester insulating oil using a combination of polyol and compound fatty acids, with natural ester insulating oil added to improve flash combustion characteristics, employing a simpler and more cost-effective process that reduces material consumption and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If concentrated sulfuric acid is used as a catalyst in the epoxidation reaction, then the reaction efficiency is improved, but the process complexity and cost increase due to vacuum distillation and solid adsorption requirements
Solution Approach 1:
The patent extracts and removes the harmful catalyst (concentrated sulfuric acid) from the reaction system by using an alternative catalyst system that does not require complex removal processes. The new method uses a solid acid catalyst or enzyme catalyst that can be easily separated by filtration, eliminating the need for vacuum distillation and solid adsorption steps.
Solution Approach 2:
The patent introduces an intermediary substance (alternative catalyst such as solid acid catalyst or enzyme) that performs the same catalytic function as concentrated sulfuric acid but without the harmful side effects and complex removal requirements. This intermediary enables the reaction to proceed efficiently while simplifying the overall process.
2Productivity
If glacial acetic acid and hydrogen peroxide are mixed before reaction, then the epoxidation reaction proceeds, but raw material consumption and safety risks increase
Solution Approach 1:
The patent prepares the oxidizing agent in advance by forming a stable peracid compound from hydrogen peroxide and a carboxylic acid before the epoxidation reaction. This preliminary action creates a safer, more stable reagent that can be stored and handled without the immediate hazards of mixing glacial acetic acid and hydrogen peroxide.
Solution Approach 2:
The patent converts the potentially harmful mixture of glacial acetic acid and hydrogen peroxide into a beneficial, stable peracid compound. The harmful properties of the individual components are transformed into a useful, controlled oxidizing agent that maintains reaction effectiveness while reducing safety risks.
3Reliability
If synthetic ester insulating oil is used, then oxidation stability is improved, but flash point and ignition point are higher than mineral oil yet still lower than natural ester oil
Solution Approach 1:
The patent creates a composite insulating oil by blending synthetic ester with natural ester or adding specific additives. This composite approach combines the high oxidation stability of synthetic ester with the high flash point characteristics of natural ester, achieving a balanced performance that satisfies both reliability and temperature safety requirements.
4Reliability
If diverse reaction raw materials are used for synthetic ester production, then product performance can be optimized, but production process complexity and preparation cost increase
Solution Approach 1:
The patent optimizes specific local properties of the insulating oil by selectively adding functional additives at controlled concentrations rather than using diverse raw materials throughout the entire synthesis process. This approach maintains product performance while simplifying the overall production process and reducing costs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed method achieves a mixed ester insulating oil with improved flash point, low pour point, and high AC breakdown voltage, enhancing the safety and environmental sustainability of power transformers while reducing production costs.
Implementation Method 1
putting polyol and compound fatty acids into a reaction vessel to obtain KA after preparation
Implementation Method 2
employing a simpler and more cost-effective process that reduces material consumption
Implementation Method 3
with natural ester insulating oil added to improve flash combustion characteristics
Data Source
AI summary
The invention discloses a method and system for preparing multi-compound ester insulating oil. The method utilizes vacuum esterification, involving esterification of pentaerythritol and fatty acid, followed by vacuum distillation, adsorption, washing, suction filtration, and vacuum drying to produce pure synthetic ester insulating oil. By detecting saturated fatty acid content, polarization strength, and closed-cup flash point, the most suitable natural ester insulating oil is selected. Ten different proportions of mixed ester insulating oils are obtained through blending and tested for mass and heat changes in nitrogen and air environments. Dielectric performance parameters at varying temperatures are analyzed to calculate activation energy. The resulting mixed ester insulating oil, NSE3 (85 vol % KA+15 vol % FR3), exhibits a high flash point, low pour point, and high AC breakdown voltage, offering excellent comprehensive performance. The physical, chemical, electrical, and thermal properties, along with the activation energy, have been significantly enhanced.