News Details
Industrial oil antioxidants
2018-1-9 17:35:46
Industrial oil antioxidants
Oxidation stability determines the service life of transformer oil, which is the main index to evaluate oil quality. Composition is the decisive factor affecting the oxidation stability of transformer oil. The oxidation of transformer oil is usually based on the free radical reaction mechanism, and the oxidation stability of different hydrocarbons and sulfur and nitrogen heteroatoms is different.
(1) hydrocarbon oxidation stability and order is: linear paraffins > inside paraffin isomerization alkane > less (no better than side chain) with side chain > monocylic aromatics > inside more alkanes and polycyclic aromatic hydrocarbons. Polycyclic naphthene and polycyclic aromatic hydrocarbons are the polar substances of the polymer, and the oxidation stability is not good. Total aromatics content is too low or too high, oil oxidation stability is bad, just the right amount of aromatic hydrocarbons, which can improve the oxidation stability of oil, because of monocylic aromatics itself is a kind of natural antioxidants, aromatic hydrocarbons, which can dissolve transformer oil oxidation sludge, but the content is too high will dissolve insulating paint, insulation performance becomes poor.
(2) polar compounds, such as sulfur and nitrogen, have been proved to have a great influence on the oxidation stability of base oil. It is generally believed that the corrosive sulfur can inhibit the oxidation of oil, but the corrosive sulfur can produce copper ion etching equipment, catalytic effect to the oil oxidation, national standards have strict limits on corrosive sulfur.
The influence of the additive amount of industrial oil on oxidation stability of transformer oil. The starting temperature of the oil for oil and regenerator is very close, and the oil of transformer before and after the regeneration device is basically free of antioxidants. When the quality fraction of the anti-oxidant (T501) added in the oil and regenerator was 0.4%, the initial oxidation temperature was close to the new oil.
Base oil mass fraction of 0.1% is added after industrial oil antioxidant T501, its initial oxidation temperature of 241.82 ℃, nearly 10 ℃ higher than that of base oil. As industrial oil antioxidants (T501) the increase of mass fraction, the initial oxidation temperature of blend oil rose, when the mass fraction of 0.7% T501, add the mass fraction of industrial oil antioxidants have no obvious effect on the initial oxidation temperature of oil. When the mass fraction of T501 in base oil of 0.3% to 0.3%, its initial oxidation temperature and the initial oxidation temperature of new oil, electricity oil standard stipulated in the mass fraction of T501 in the transformer oil must be up to 0.3% ~ 0.5%.
The effect of gas chromatography on the oxidation stability of the oil in transformer oil. The transformer oil should have reliable insulation, no precipitation and good compatibility with the transformer structure material during the use. The method of rapid determination of this performance is the IEC-474 standard method of the international electrical technology commission.
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.
Cas no. : 101-02-0
HS: 29209019.00
The most important index of products: colorless, yellow liquid
Density (rho) 2525:1.183-1.192, refractive index (eta 020) : 1.585 1.590, freezing point ° C: 19-24, chloride (Cl - %) : 0.20 or less
Tax refund: the current tax refund of Triphenyl phosphite is 9 percent
Raw materials: phenol, phosphorus trichloride, phosphorus trichloride.
In the modern structure transformer oil is influenced by the ionization of the high voltage electric field and the gas is precipitated to form bubbles. Under the action of high voltage electric field, these bubbles occur partial discharge, resulting in transformer oil deterioration and transformer damage. The oxidation stability and gas analysis of transformer oil are largely related to the content of aromatic hydrocarbons. With the increase of aromatics content, the sensitivity and stability of the antioxidant were decreased, and the stability of the precipitated gas was improved.
In order to determine the oxidation stability of transformer oil and the relationship between the gas chromatography and its aromatics content. The oxidation stability and gas analysis of the transformer oil samples with different kinds of process were tested. Experiment shows that with the aromatics content increased from 4% to 4%, transformer oil oxidation induction period from 320 h to 50 h according to IEC 628 method for determining when the aromatics content lower than 20%, transformer oil product gas; When the content of aromatic hydrocarbon is higher than 20%, the transformer oil absorbs the gas, while the oxidation induction period of the transformer oil is less than 100h.
International electric technical committee thinks, transformer oil oxidation induction period of the lowest should be 120 h, at present the main refining process of transformer oil, its oxidation stability and analysis there is a contradiction between gas. One way to resolve this contradiction is to add additives.
The influence of transformer oil composition on oxidation stability of transformer oil. Choice of distillate oil. Oil fraction is wide contains more of polycyclic aromatic hydrocarbons, make its oxidation resistance and against deoxidant susceptibility variation, so from the point of general transformer oil production, scope of distillate demand should be in flash point under the condition of qualified, fraction not too wide.
Refining process and refining depth. Yin hongbo et al. showed that furfural refining should have deep refining depth, which is the key to ensure product quality. Aniline point of refined oil shall be not less than 75 ℃; It is not only the influence of acid value and oil color, but also the oxidation stability.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Oxidation stability determines the service life of transformer oil, which is the main index to evaluate oil quality. Composition is the decisive factor affecting the oxidation stability of transformer oil. The oxidation of transformer oil is usually based on the free radical reaction mechanism, and the oxidation stability of different hydrocarbons and sulfur and nitrogen heteroatoms is different.
(1) hydrocarbon oxidation stability and order is: linear paraffins > inside paraffin isomerization alkane > less (no better than side chain) with side chain > monocylic aromatics > inside more alkanes and polycyclic aromatic hydrocarbons. Polycyclic naphthene and polycyclic aromatic hydrocarbons are the polar substances of the polymer, and the oxidation stability is not good. Total aromatics content is too low or too high, oil oxidation stability is bad, just the right amount of aromatic hydrocarbons, which can improve the oxidation stability of oil, because of monocylic aromatics itself is a kind of natural antioxidants, aromatic hydrocarbons, which can dissolve transformer oil oxidation sludge, but the content is too high will dissolve insulating paint, insulation performance becomes poor.
(2) polar compounds, such as sulfur and nitrogen, have been proved to have a great influence on the oxidation stability of base oil. It is generally believed that the corrosive sulfur can inhibit the oxidation of oil, but the corrosive sulfur can produce copper ion etching equipment, catalytic effect to the oil oxidation, national standards have strict limits on corrosive sulfur.
The influence of the additive amount of industrial oil on oxidation stability of transformer oil. The starting temperature of the oil for oil and regenerator is very close, and the oil of transformer before and after the regeneration device is basically free of antioxidants. When the quality fraction of the anti-oxidant (T501) added in the oil and regenerator was 0.4%, the initial oxidation temperature was close to the new oil.
Base oil mass fraction of 0.1% is added after industrial oil antioxidant T501, its initial oxidation temperature of 241.82 ℃, nearly 10 ℃ higher than that of base oil. As industrial oil antioxidants (T501) the increase of mass fraction, the initial oxidation temperature of blend oil rose, when the mass fraction of 0.7% T501, add the mass fraction of industrial oil antioxidants have no obvious effect on the initial oxidation temperature of oil. When the mass fraction of T501 in base oil of 0.3% to 0.3%, its initial oxidation temperature and the initial oxidation temperature of new oil, electricity oil standard stipulated in the mass fraction of T501 in the transformer oil must be up to 0.3% ~ 0.5%.
The effect of gas chromatography on the oxidation stability of the oil in transformer oil. The transformer oil should have reliable insulation, no precipitation and good compatibility with the transformer structure material during the use. The method of rapid determination of this performance is the IEC-474 standard method of the international electrical technology commission.
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.
Cas no. : 101-02-0
HS: 29209019.00
The most important index of products: colorless, yellow liquid
Density (rho) 2525:1.183-1.192, refractive index (eta 020) : 1.585 1.590, freezing point ° C: 19-24, chloride (Cl - %) : 0.20 or less
Tax refund: the current tax refund of Triphenyl phosphite is 9 percent
Raw materials: phenol, phosphorus trichloride, phosphorus trichloride.
In the modern structure transformer oil is influenced by the ionization of the high voltage electric field and the gas is precipitated to form bubbles. Under the action of high voltage electric field, these bubbles occur partial discharge, resulting in transformer oil deterioration and transformer damage. The oxidation stability and gas analysis of transformer oil are largely related to the content of aromatic hydrocarbons. With the increase of aromatics content, the sensitivity and stability of the antioxidant were decreased, and the stability of the precipitated gas was improved.
In order to determine the oxidation stability of transformer oil and the relationship between the gas chromatography and its aromatics content. The oxidation stability and gas analysis of the transformer oil samples with different kinds of process were tested. Experiment shows that with the aromatics content increased from 4% to 4%, transformer oil oxidation induction period from 320 h to 50 h according to IEC 628 method for determining when the aromatics content lower than 20%, transformer oil product gas; When the content of aromatic hydrocarbon is higher than 20%, the transformer oil absorbs the gas, while the oxidation induction period of the transformer oil is less than 100h.
International electric technical committee thinks, transformer oil oxidation induction period of the lowest should be 120 h, at present the main refining process of transformer oil, its oxidation stability and analysis there is a contradiction between gas. One way to resolve this contradiction is to add additives.
The influence of transformer oil composition on oxidation stability of transformer oil. Choice of distillate oil. Oil fraction is wide contains more of polycyclic aromatic hydrocarbons, make its oxidation resistance and against deoxidant susceptibility variation, so from the point of general transformer oil production, scope of distillate demand should be in flash point under the condition of qualified, fraction not too wide.
Refining process and refining depth. Yin hongbo et al. showed that furfural refining should have deep refining depth, which is the key to ensure product quality. Aniline point of refined oil shall be not less than 75 ℃; It is not only the influence of acid value and oil color, but also the oxidation stability.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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