How to determine conditionnot lubricating oils with alkaline additives

 

The invention relates to the analysis of lubricating oils with alkaline additives, namely, to determine conditionnot oils. Select a portion of the oil and mix it with ethanol solution of 0.1 mol/DM3hydrochloric acid in the presence of a specified number of mixed indicator consisting of ethanol and toluene, taken up in a volume ratio of 3:7, and methyl red and methylene blue, taken in a volumetric ratio of 1:1, while the added amount of an ethanol solution of 0.1 mol/DM3hydrochloric acid sufficient to neutralize the minimum allowable base number of this brand, determined by calibration table and the color mixture of green judge conditionnot lubricating oil, and the color purple the color of his neconditionate. Speeding up and simplification of the analysis. table 2.

The invention relates to "khimmotology" analysis of motor oils, namely the definition of conditionnot one of the indicators is alkaline, and can be used for quality control of motor oils.

In practice, the quality of the (conditional) motor oils evaluated by alkaline number, the value of which varies from 0.9 to 60 toplivo, lubricants and coolants. M: "engineering" 1985, S. 112-114).

The authors task was to develop a rapid method to determine conditionnot motor oil, given the normative (minimum) indicators SC (see ibid., table 25), because there are cases when the contents of the package with the direction of the mark does not meet the necessary criteria.

To determine the number neutralization in oils (definition SC) titration method using a color indicator is used to GOST 29255-91 (Petroleum products and lubricating oils. Determining the number of neutralization method of a color indicator titration). However, this method is not recommended for control DC motor oils with alkaline additives, what specifically listed on the 1st page of the standard.

There is also known a method of estimating SCH of lubricating oils using a special indicator paper (Gushchina A. I., Ostrikov centuries, Kashnikov L. C., Gushchin Century A. the Chemistry and technology of fuels and oils, 1998, 6, S. 42). Using this method, determine the specific SC (quantitative value). However, this method is not suitable for the analysis of lubricating oils with a wide range of values of alkaline numbers from 0.9 to 60 mg KOH/g, as it allows to capture the base number There is a method of quantitative determination of base number (the neutralisation number) in oils with alkaline additives potentiometric titration. The definition is the titration of a sample oil alcoholic solution of hydrochloric acid, the readout potential depending on the amount added titrated solution and determining the amount spent titrated solution of the inflection point on the titration curve, and if this point is expressed vaguely, then the end point of the titration, corresponding to the potential of freshly prepared non-aqueous acidic buffer solution (GOST 11362-96. Oil products. Testing methods. Method of determination of the neutralization number by potentiometric titration). This method has the following disadvantages: significant duration analysis, reaching the standards of 95 minutes; - the need for complex expensive laboratory equipment, including a potentiometer (or pH meter), analytical and technical scale, stopwatch, automatic burette and other laboratory equipment in the amount of fourteen titles, as well as thirteen different solutions, which makes it impossible for the analyses in unelaborated (field) conditions.

The closest to the technical nature of the claimed invention and taken as a prototype of an automated method for determining broken the spine of the IR spectrophotometer, the comparison of the obtained results with the given values and the calculation of the generalized indicator of quality for a given program (RF Patent 2075062, G 01 N 21/35, 1994 ).

The disadvantage of this method is the high cost, due to the presence of the IR spectrophotometer and the computer. In addition, this method cannot be applied in field conditions since it requires special conditions of installation.

The technical result - reduction of time determine conditionnot motor oils while reducing costs and providing analysis in unelaborated (field) conditions.

This technical result is achieved by the fact that in the known method of determining conditionnot motor oils with alkaline additives, including the selection of the sample of oil, according to the invention a portion of the oil mixed with ethanol solution of 0.1 mol/DM3hydrochloric acid in the presence of a specified number of mixed indicator consisting of ethanol and toluene, taken in the ratio of 3:7, and methyl red, methylene blue, taken in the ratio 1:1, and the ethanol solution of 0.1 mol/DM3hydrochloric acid is added in sufficient quantity to neutralize the minimum value malochka.

Components used as mixed indicator, issued by the industry: ethanol - GOST 18300-87; toluene - GOST 5789-78; methyl red is a 4-dimethylamino-2-carboxybenzoyl. Produced according to TU 6-09-5169-84; methylene blue trihydrate is chloride N, N, N', N'-tetramethylthiourea. Produced according to TU 6-09-29-76.

In fact, this mixed indicator consisting of ethanol and toluene in a volume ratio of 3:7 and methyl red and methylene blue, taken in a volumetric ratio of 1:1 obtained in the process of conducting research for the fixation discoloration of the mixture at the minimum value (according to GOST standards for oils with alkaline additives) base number. Mixed indicator, we take in a given quantity (the volume of 2-4 cm3). The number of mixed indicator chosen within these limits for a clear separation of zones.

It is known that in the standards and specifications for modern motor oil contains special additives that stock is neutralized in the oil acid) is normalized mandatory alkalinity in mg KOH per 1 g of oil, which, depending on the group's application should not be less than a certain value (G. P. Pokrovsky. Fuel, lubricants and ohla the market used the minimum value of the base number (as the lower limit of conditionnode) specific oil with alkaline additives, why experimentally received a sufficient amount of an ethanol solution of 0.1 mol/DM3hydrochloric acid required to obtain the green color in the presence of experimentally obtained mixed indicator. Actually received table normative additives solution of 0.1 mol/DM3(PL.1).

Knowing the minimum value of the base number (on state) specific oils with alkaline additives, it is necessary to analyze the sample of oil to use hydrochloric acid selected concentration in volume (cm3), are given in table. 1.

Having obtained experimentally tables additives reduces the consumption of an ethanol solution of 0.1 mol/DM3hydrochloric acid (excluding the step of determining the quantity of HCl for the minimum value DC reference oil of this brand).

With this table, and mixed indicator, the consumer is able to assess the quality of motor oil even at gas stations.

How to determine conditionnot motor oils with alkaline additives is as follows.

Example 1. Definition of conditionnot engine oil MS-20 points containing alkaline additive.

Standard minimum base number that IARC> where also add 3 cm3indicator solution, representing a mixture of 30 cm3ethanol and 70 cm3toluene with the addition of 3 drops of mixed indicator-based indicators methyl red and methylene blue.

According to the table. 1 define the normalized volume of 0.1 mol/DM3ethanol solution of hydrochloric acid, 0.15 cm3that also added to the test tube. The mixture is stirred manually by shaking for 3 minutes In the color of the mixture turns green, indicating that conditionnot oil.

Example 2. Definition of conditionnot motor oil M-8D2to containing alkaline additive.

Standard minimum base number of the oil is 6.0 mg KOH/g

Engine oil quantity 1 cm3bring in a test tube with a capacity of 10 cm3that also add 3 cm3indicator solution, representing a mixture of 30 cm3ethanol and 70 cm3toluene with the addition of 3 drops of mixed indicator-based indicators methyl red and methylene blue.

According to the table. 1 define the normalized volume of 0.1 mol/DM3ethanol solution of hydrochloric acid, was found to be 0.96 cm3that also dobavlaet, it shows that neconditionate oil alkaline.

The method has been tested in comparison with the method of potentiometric titration according to GOST 11362-96. The results are given in table. 2, from which it follows that the proposed rapid method allows to obtain reliable data on conditionnot motor oils, comparable with values obtained in the determination of alkaline numbers according to GOST 11362-96. The method can be used mainly for motor oils with alkaline additives, the most common of which are listed in the table.1.

The use of the invention will significantly reduce the duration of the analysis, to exclude the use of expensive equipment, to provide analysis, both in the laboratory and in unelaborated (field) conditions. The duration of the analysis by the claimed method is not more than 15 minutes

Sources of information 1. G. P. Pokrovsky. Fuel, lubricants and coolants". M.: Izd. Mechanical engineering 1985, - S. 105-106, 112-114, PL.25.

2. GOST 29255-91. Petroleum products and lubricating oils. Determining the number of neutralization method of a color indicator titration. M.: Publishing house of standards, 1992, 13 S. L. Chemistry and technology of fuels and oils, 1998, 6, - S. 42.

4. GOST 11362-96. Oil products. Testing methods. Method of determination of the neutralization number by potentiometric titration. M. : Publishing house of standards, 1996, - 25 C.

5. RF Patent 2075062, G 01 N 21/35, 1994.

Claims

How to determine conditionnot lubricating oils with alkaline additives, including the selection of the sample oil, characterized in that a portion of the oil mixed with ethanol solution of 0.1 mol/DM3hydrochloric acid in the presence of a specified number of mixed indicator consisting of ethanol and toluene in a volume ratio of 3: 7 and methyl red and methylene blue, taken in a volumetric ratio of 1: 1, and the ethanol solution of 0.1 mol/DM3hydrochloric acid is added in sufficient quantity to neutralize the minimum value of the base number of the reference oil of this brand, and color mixture of green judge conditionnot motor oil.

 

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