What are the factors affecting the oxidation stability test and the points for attention
2018/5/17 Viewers:
The factors affecting the oxidation stability test and the points for attention are as follows: (1) the temperature has great influence on the speed of the oil recovery process. The test temperature should be strictly controlled within the prescribed limits. If the temperature is higher than the prescribed temperature, the oxidation rate of the oil will be accelerated; conversely, the oxidation rate of the oil will slow down. (2) the size of the total oxygen volume has an impact on the test results. Because of increasing oxygen consumption, he accelerated the rate of oxidation reaction. Conversely, when the volume of oxygen was below the prescribed amount, the oxidation rate of slow oil would be slowed down. (3) the size of the metal catalyst added, the purity of the material and whether it is handled well in advance, the Ministry will affect the oxidation rate of the oil and make the test result inaccurate. (4) it is related to the cleanness and dryness of the instruments such as oxidation tubes. For example, residual acid in lotion, naphthenic acid or other organic acids can accelerate the oxidation of oil. In addition, when there is water. Under test conditions, it will accelerate the corrosion of metal sheets or wires, and react with organic acids in the oil to form metal saponification, thus increasing the test results. (5) solvents (refined gasoline or petroleum ether) used for the determination of sediment content are not allowed to contain aromatic hydrocarbons. Because aromatic hydrocarbons can dissolve sediment, the sediment content is low. When determining the acid value, the end point should be correctly judged. It is not suitable to use alkali blue 6B as indicator for the oil with deep color after oxidation. The BTB can be used as an indicator or the potential difference method can be used to determine the end point. (7) when the sediment is measured, it is necessary to clean all the oil marks on the filter paper and the filter paper, otherwise the residue will be mistaken for the sediment and the result of the sediment determination is high.
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