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Antioxidation additive for transformer oil
2018-1-4 23:52:55
Antioxidation additive for transformer oil
For transformer oil, the oxidation and deterioration of transformer oil is unavoidable due to the existence of dissolved oxygen and the action of environment, temperature, copper, iron and metal catalyst. Acid value or neutralization value, oil sludge and dielectric loss factor are all indicators to characterize the fast oxidation performance of the oil.
The oxidation reaction of petroleum hydrocarbons is carried out by radical chain reaction mechanism based on alkyl radical and peroxyl radical. The oxidation process of oil depends on the speed of reaction. Generally, it can be divided into 3 stages, that is, the induction period, the reaction period and the delay period.
The oxidation process is a chain reaction. If it is not prevented, the reaction speed will become faster and faster, that is, some deterioration speed is accelerated. The peroxisome or other free radicals are further reacted with hydrocarbon molecules in the oil. Produce alcohols, ketones, carboxylic acids and other oxidation products. Under certain conditions, these oxidation products will be further reacted. The formation of thickened polymer compounds, resin like substances, oil sludge, carbon deposits and so on, so as to deteriorate the oil rapidly.
The delay period is the process of organizing this chain reaction, which can generally be achieved by adding antioxidant additives of transformer oil to oil products.
Transformer oil antioxidant additives commonly used can be divided into two categories: the first category is the destruction of free radicals in the reaction period just the formation of free radicals, by transformer oil antioxidant additive release a H atom to radical combination, so as to form stable compounds, phenol and amine belongs to this class is second, and the the formation of peroxides, there exist in natural antioxidants (such as sulfur compounds, etc.) belong to this category.
Most experiments can prove that the first kind of antioxidant additive is more effective in adding oil that is not oxidized or slightly oxidized, and has very poor effect on the oxidized transformer oil. White refined, because no material can prevent the oxidation process, so the degradation speed of the oil quickly, acid fast rise, and after the deterioration of oil after a certain period of time in the. A yellow precipitated oxidation product can be seen.
Moderately refined, containing a certain amount of natural antioxidants in oil, oil by rapid oxidation of short time, natural antioxidants prevent free radicals, so that the reaction speed is slow, the oxidation product of phenols and nitrogen and sulfur compounds, the formation of black residue. The phenolic antioxidants are added into the transformer oil.
Triphenyl phosphite (TPPi antioxidants, stabilizer) is the main raw materials of phenol, phosphorus oxychloride, phosphorus trichloride, phosphorus oxychloride, phosphorus trichloride belong to highly toxic chemicals, state control chemicals. Through raw material phenol, triclosan phosphorous and trichloride phosphorus, the direct method of trichloro phosphorus is used to direct (also known as thermal) and the indirect method of trichloride phosphorus (also known as cold method).
According to the relevant state regulations, tppi is currently exported to 9 kinds of dangerous goods.
Triphenyl phosphite (TPPi antioxidants, stabilizer) is mainly used in PVC, polyethylene, polypropylene, polystyrene, polyester, abs resin, epoxy resin, synthetic rubber antioxidant stabilizer, used in polyvinyl chloride (PVC) products as a chelating agent.
The oxidation rate is slower before the consumption of antioxidants. With the consumption of antioxidants, the antioxidants in oil products decrease, and its oxidation rate increases rapidly. With both natural and synthetic two kinds of antioxidants, transformer oil, in general, is an oil with good antioxidant sensitivity.
The content of polycyclic aromatic hydrocarbons is less. Because of its easy oxidation of polycyclic aromatic hydrocarbons in the oxidation process, consumption of free oxygen dissolved in oil, at the expense of their own, the protection effect of others, to prevent further oxidation of other oil molecules, so molecules of polycyclic aromatic hydrocarbon is an antioxidant, but because of polycyclic aromatic hydrocarbons in the final oxidation product is easy to deposit the sludge, so the high quality of the transformer oil content requires strict control of the indicators, but also oil refining process to remove the main group of refining.
The effect of non hydrocarbon compounds. Non hydrocarbon compounds in the lubricating oil include nitrogen compounds, sulfur compounds, colloid and asphaltenes. It is well known that nitrogen compounds, colloid and asphaltenes have adverse effects on the oxidation stability of oil products.
Effects of sulfur compounds on the properties of lubricating oils, there are 3 views: 1 domestic natural sulfide in oil hydrocarbon is more easily oxidized, is a potential cause of deposition, but also the cause of oil color instability; 2 is the natural sulfide in lubricating oil has antioxidant effect, helps to improve the oxidation stability of lubricating oil; 3 is the sulfur in lubricating oil is too high oxidation stability of oil content in the appropriate good bad.
But both of these 3 views have not been verified. The oxidation decomposition products of sulfide existing in oil will cause strong corrosion to metals and make the oil with special odor of sulfide, resulting in the failure of copper corrosion of base oil, which is caused by excessive sulfide content. Sulfur containing compounds are bad components of the lubricating oil and should be removed when refining. In order to improve the sensitivity of Turbo oil base oil to antioxidants, we should improve the refining depth, remove aromatics, colloidal and nitrides, and reduce sulfide content.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
For transformer oil, the oxidation and deterioration of transformer oil is unavoidable due to the existence of dissolved oxygen and the action of environment, temperature, copper, iron and metal catalyst. Acid value or neutralization value, oil sludge and dielectric loss factor are all indicators to characterize the fast oxidation performance of the oil.
The oxidation reaction of petroleum hydrocarbons is carried out by radical chain reaction mechanism based on alkyl radical and peroxyl radical. The oxidation process of oil depends on the speed of reaction. Generally, it can be divided into 3 stages, that is, the induction period, the reaction period and the delay period.
The oxidation process is a chain reaction. If it is not prevented, the reaction speed will become faster and faster, that is, some deterioration speed is accelerated. The peroxisome or other free radicals are further reacted with hydrocarbon molecules in the oil. Produce alcohols, ketones, carboxylic acids and other oxidation products. Under certain conditions, these oxidation products will be further reacted. The formation of thickened polymer compounds, resin like substances, oil sludge, carbon deposits and so on, so as to deteriorate the oil rapidly.
The delay period is the process of organizing this chain reaction, which can generally be achieved by adding antioxidant additives of transformer oil to oil products.
Transformer oil antioxidant additives commonly used can be divided into two categories: the first category is the destruction of free radicals in the reaction period just the formation of free radicals, by transformer oil antioxidant additive release a H atom to radical combination, so as to form stable compounds, phenol and amine belongs to this class is second, and the the formation of peroxides, there exist in natural antioxidants (such as sulfur compounds, etc.) belong to this category.
Most experiments can prove that the first kind of antioxidant additive is more effective in adding oil that is not oxidized or slightly oxidized, and has very poor effect on the oxidized transformer oil. White refined, because no material can prevent the oxidation process, so the degradation speed of the oil quickly, acid fast rise, and after the deterioration of oil after a certain period of time in the. A yellow precipitated oxidation product can be seen.
Moderately refined, containing a certain amount of natural antioxidants in oil, oil by rapid oxidation of short time, natural antioxidants prevent free radicals, so that the reaction speed is slow, the oxidation product of phenols and nitrogen and sulfur compounds, the formation of black residue. The phenolic antioxidants are added into the transformer oil.
Triphenyl phosphite (TPPi antioxidants, stabilizer) is the main raw materials of phenol, phosphorus oxychloride, phosphorus trichloride, phosphorus oxychloride, phosphorus trichloride belong to highly toxic chemicals, state control chemicals. Through raw material phenol, triclosan phosphorous and trichloride phosphorus, the direct method of trichloro phosphorus is used to direct (also known as thermal) and the indirect method of trichloride phosphorus (also known as cold method).
According to the relevant state regulations, tppi is currently exported to 9 kinds of dangerous goods.
Triphenyl phosphite (TPPi antioxidants, stabilizer) is mainly used in PVC, polyethylene, polypropylene, polystyrene, polyester, abs resin, epoxy resin, synthetic rubber antioxidant stabilizer, used in polyvinyl chloride (PVC) products as a chelating agent.
The oxidation rate is slower before the consumption of antioxidants. With the consumption of antioxidants, the antioxidants in oil products decrease, and its oxidation rate increases rapidly. With both natural and synthetic two kinds of antioxidants, transformer oil, in general, is an oil with good antioxidant sensitivity.
The content of polycyclic aromatic hydrocarbons is less. Because of its easy oxidation of polycyclic aromatic hydrocarbons in the oxidation process, consumption of free oxygen dissolved in oil, at the expense of their own, the protection effect of others, to prevent further oxidation of other oil molecules, so molecules of polycyclic aromatic hydrocarbon is an antioxidant, but because of polycyclic aromatic hydrocarbons in the final oxidation product is easy to deposit the sludge, so the high quality of the transformer oil content requires strict control of the indicators, but also oil refining process to remove the main group of refining.
The effect of non hydrocarbon compounds. Non hydrocarbon compounds in the lubricating oil include nitrogen compounds, sulfur compounds, colloid and asphaltenes. It is well known that nitrogen compounds, colloid and asphaltenes have adverse effects on the oxidation stability of oil products.
Effects of sulfur compounds on the properties of lubricating oils, there are 3 views: 1 domestic natural sulfide in oil hydrocarbon is more easily oxidized, is a potential cause of deposition, but also the cause of oil color instability; 2 is the natural sulfide in lubricating oil has antioxidant effect, helps to improve the oxidation stability of lubricating oil; 3 is the sulfur in lubricating oil is too high oxidation stability of oil content in the appropriate good bad.
But both of these 3 views have not been verified. The oxidation decomposition products of sulfide existing in oil will cause strong corrosion to metals and make the oil with special odor of sulfide, resulting in the failure of copper corrosion of base oil, which is caused by excessive sulfide content. Sulfur containing compounds are bad components of the lubricating oil and should be removed when refining. In order to improve the sensitivity of Turbo oil base oil to antioxidants, we should improve the refining depth, remove aromatics, colloidal and nitrides, and reduce sulfide content.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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