The principle of determining the acid value of oil and the extraction process of oil filter
2018/5/15 Viewers:
The extraction process of the oil filter consists mainly of the early filtration of the filter system. The extraction of the oil is satisfied by the heat treatment of the heating system and the precision filtration of dehydration and decolorization. There are two kinds of methods for determining the acid value of oil in power system, that is, indicator titration and potentiometric titration.
1. indicator titration. The principle of titration of acid value by indicator method is mainly based on the theory of proton and proton bases, and is based on the principle of neutralization titration in non-aqueous media. The acidic components in oil are mainly proton acids, the process of acid and alkali neutralization in non water medium. The following general formula can be used to express the above reaction. It is known that non water and reaction are actually proton transfer, and the proton transfer is realized by SH+2, and the non water solvent can be used to determine the acid value at present. It is 95% of ethyl alcohol or anhydrous acetic acid. In the actual determination of acid value of oil products, it is the use of the standard solution of potassium hydroxide ethanol and the change of the color of the indicator to determine the end point of the acid base neutralization reaction. The main reaction is to calculate the mgKOH/g number of acid value according to the ML number consumed by the standard potassium hydroxide solution as follows.
2. potentiometric method. This method usually uses the mixture of ethanol and benzene to extract the acidic components in the oil, titrated by potassium hydroxide ethanol standard solution, and the terminal point is determined by potential difference method. The method is based on hydroquinone as indicator electrode and mercury oxide as reference electrode (the electrode potential is constant). Hydroquinone is a mixture of hydroquinone and para quinone, which has very little solubility in water. These two substances can form reversible oxidation reduction system and are related to the concentration of H+. Therefore, the electrode potential of hydroquinone electrode changes with the concentration of H+ in the oil. Therefore, the potential difference between the mercury oxide electrode (the reference electrode) and the acid component of the potassium hydroxide and the oil are gradually reduced to zero, which is the end point of the titration, and the pH is about 7.7.
1. indicator titration. The principle of titration of acid value by indicator method is mainly based on the theory of proton and proton bases, and is based on the principle of neutralization titration in non-aqueous media. The acidic components in oil are mainly proton acids, the process of acid and alkali neutralization in non water medium. The following general formula can be used to express the above reaction. It is known that non water and reaction are actually proton transfer, and the proton transfer is realized by SH+2, and the non water solvent can be used to determine the acid value at present. It is 95% of ethyl alcohol or anhydrous acetic acid. In the actual determination of acid value of oil products, it is the use of the standard solution of potassium hydroxide ethanol and the change of the color of the indicator to determine the end point of the acid base neutralization reaction. The main reaction is to calculate the mgKOH/g number of acid value according to the ML number consumed by the standard potassium hydroxide solution as follows.
2. potentiometric method. This method usually uses the mixture of ethanol and benzene to extract the acidic components in the oil, titrated by potassium hydroxide ethanol standard solution, and the terminal point is determined by potential difference method. The method is based on hydroquinone as indicator electrode and mercury oxide as reference electrode (the electrode potential is constant). Hydroquinone is a mixture of hydroquinone and para quinone, which has very little solubility in water. These two substances can form reversible oxidation reduction system and are related to the concentration of H+. Therefore, the electrode potential of hydroquinone electrode changes with the concentration of H+ in the oil. Therefore, the potential difference between the mercury oxide electrode (the reference electrode) and the acid component of the potassium hydroxide and the oil are gradually reduced to zero, which is the end point of the titration, and the pH is about 7.7.
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