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Method for determining mineral oil total acid value

A determination method and technology of total acid value, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of analysis workers' health impact, serious environmental pollution, strong irritation, etc., to reduce Injury to the human body, toxicity reduction, and easy operation

Inactive Publication Date: 2008-06-25
SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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  • Abstract
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Problems solved by technology

Because toluene is highly toxic and highly irritating, it will have a certain impact on the health of analysts, and it will also seriously pollute the environment.

Method used

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  • Method for determining mineral oil total acid value

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specific Embodiment approach

[0017] The anhydrous ethanol and petroleum ether (60-90° C.) involved in this example are all analytically pure, potassium hydroxide is of superior grade, and the water used is secondary distilled water.

[0018] Measure 40ml of petroleum ether and 40ml of 99% ethanol aqueous solution into a beaker, insert a measuring compound electrode and a burette under magnetic stirring, and perform potentiometric titration to obtain a blank value.

[0019] Accurately weigh a certain amount of lubricating oil sample, add it to a 150ml beaker, then add 50ml each of petroleum ether and 99% ethanol aqueous solution, heat it to about 50°C in a water bath, stir for 5min to make the solution clear and transparent, and then cool After reaching room temperature, use 0.05molKOH / ethanol solution as the titrant on the potentiometric titrator to carry out potentiometric titration, use the potential jump of the potentiometric titration curve to judge the end point, and then calculate according to the vo...

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Abstract

The invention relates to a measuring method for mineral oil acid value, implemented according to the following steps that: (1) petroleum ether and 99 percent ethanol aqueous solution are mixed according to the volume ratio of 1:1 to obtain mixed solvent; (2) KOH ethanol solution with the concentration being 0.05mol / L is prepared as volumetric solution; (3) according to the method of GB / T7304, the mixed solvent obtained in step (1) is measured by a potentiometric titrator to obtain a blank value; (4) a certain quantity of mineral oil sample, which is weighed out and is added in the mixed solvent, is stirred and heated to 45 to 55 DEG C, thereby ensuring that the mineral oil sample is completely dissolved in the mixed solvent; then, the mixture is cooled down; (5) according to the method of GB / T7304, 0.05molKOH / ethanol solution is used as volumetric solution to complete potentiometric titration on the potentiometric titrator; therefore, an end point can be judged by means of the potential jump on the potentiometric titration curve; finally, according to the volume of consumed volumetric solution, the total acid value of lubricating oil sample can be obtained through calculation.

Description

technical field [0001] The invention relates to an oil detection method, in particular to a method for measuring the acid value of mineral oil. Background technique [0002] The acid value is the number of milligrams of potassium hydroxide (KOH) required to neutralize the acidic components in 1 gram of lubricating oil, usually expressed in mgKOH / g. Acids contained in oil mainly refer to organic acids (such as naphthenic acid, fatty acid, phenolic compounds, mercaptans, etc.), inorganic acids (carbon dioxide, hydrogen sulfide, etc.), cheese, cheese, colloid, heavy metal salts , ammonium salt and other weak bases, acid salts of polybasic acids, etc. These substances are not only inherent in crude oil, but also produced under storage and use conditions, and even include additives and their change products. Although there is no simple quantitative relationship between the acid value of the product and the corrosivity of the product, it is still widely used in the corrosion and...

Claims

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Application Information

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IPC IPC(8): G01N27/44G06F19/00
Inventor 刘仁德沈娟
Owner SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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