The method of determining the base number of motor oils

 

(57) Abstract:

The method is applicable for assessing the quality of motor oils and can be used to determine their suitability when using machinery. Analyzed drip the oil sample is introduced into a mixture consisting of (711)% distilled water and (291)% solvent, whereby the solvent consists of 50% toluene and 50% isopropanol, and as an indicator of use filter paper of "blue ribbon impregnated with 0.5% aqueous solution baltimoore blue. Improved accuracy and simplified analysis.

The invention relates to assessing the quality of motor oils and can be used to determine their suitability when operating machinery.

Known alkaline field kit for testing oils with techeval indicator (see patent 4288402 USA, G 01 N 33/28) containing at least one bubble with indication of its internal volume and internal solvent that is not miscible with water. In the bubble is placed indicator mixture, which contains 20-28 wt.% lower alcohol, 56-79 wt.% water, 6-12 wt.% water-soluble inorganic salt and 0.2-0.3 wt.% the concentrated aqueous solution of the selected indicator. In accounted for the change in the color of the lower layer when exceeding pH by 0.05 from baseline.

The disadvantage of this kit is that to ensure reliable discoloration of the lower layer when exceeding pH by 0.05 from baseline to the mixture is added hydroxide (lye), which reduces the reliability of testimony alkalinity oil. The presence indicator in a mixture of lower alcohol contributes to the development of the coagulation process, which to some extent leads to the formation of flakes precipitated. The presence of alcohol and water when mixing and adding the analyzed oil causes clouding of the solution, which complicates the accurate coloring.

The closest known ways to declared on the achieved effect and the composition of the solution is a method of assessing the quality of lubricating oil (see ed. St. USSR 1337743, G 01 N 21/78, 31/22), which consists in processing the analyzed oil sample spiritualuality solution of inorganic acid in the presence of the indicator with the subsequent comparison of the staining solution with the standard. At the same time analyze drip the oil sample is introduced into a solution of hydrochloric acid concentration of 0.0005-0,005 mol/DM3and the ratio of the volume of the solution and the mass of injected sample is determined depending on the minimum acceptable alkaline the oil, g;

a - the minimum allowable for the analyzed oil is the base number, mg KOH/g;

With the concentration of hydrochloric acid in spiritualisation solution, mol/DM3.

The disadvantages of this method of determining the base number should include the following. Short shelf life spirtotorgovtsev solution with concentration of hydrochloric acid 0,0005-0,005 mol/DM3. No noticeable transitions of colors, when values of the base number of the monitored oil sample 2.5-3.5 mg KOH/g not detected difference colors. When determining the base number in the dirty oils is dominated by dark brown or black shades, define color is almost impossible. If the solvent is to add water to tint color, it will turn cloudy emulsion with an indeterminate color. The use of hydrochloric acid by the method complicates it and makes it highly toxic.

The task of the invention is to simplify the method and to improve the accuracy of determining the base number of motor oils by the color of the indicator solution.

This object is achieved in that the analyzed drip the oil sample is introduced into a mixture consisting of (711)% distillirovanna the use of filter paper of "blue ribbon", impregnated with 0.5% aqueous solution baltimoore blue. While toluene dissolves contained in the analyzed oils, resins, and isopropanol promotes complete extraction of basic compounds, light - filter paper of "blue ribbon impregnated with 0.5% aqueous solution baltimoore blue, provides a quick change and a good color transition at different alkali numbers oils that provides improved precision of their determination. Shelf life is not limited, as the mixture of distilled water and the solvent and the input indicator is produced prior to analysis. The storage of water and solvent is carried out in separate glass containers, and the indicator in a separate package.

For the implementation of the method of preparing the indicator. For no less than a day to prepare a 0.5% aqueous solution baltimoore blue. To prepare the solution is poured into the flask, for example, 200 ml of distilled water and make to 1 g baltimoore blue, thoroughly shaken several times. Through the day prepared with a 0.5% aqueous solution baltimoore blue gently, without stirring the precipitate formed on the bottom of the flask, poured into the mold. Then take the up 1 min at full immersion of the paper, take it out of solution, allow the solution to drain from the filter paper. After which it is dried in limbo in a fume hood. After drying the impregnated filter paper cut into strips the size of 0,710 see Bands put in paper bags for storage (for example, 100 pieces).

The solvent is prepared as follows. Take a container, for example a 3-liter, pour 1 liter of toluene and 1 l of isopropanol and mix thoroughly, and then poured into 200 mm capacity, tight-fitting plastic lids. Distilled water is also stored in 200-millimeter containers.

The method is as follows. A glass container with a volume of 10 ml fill to 1/2 volume (5 ml) of distilled water. There also put a strip of filter paper of "blue ribbon impregnated with 0.5% aqueous solution baltimoore blue. Measuring tube measure 2 ml of the solvent of 200 ml capacity for storage of solvent and add it to a glass bowl. Then it also make one or two drops of the analyzed oils. Thus prepared mixture of distilled water, component (711)% of the total volume of the mixture, and the solvent component (291)% is the changing color of the aqueous layer of the solution determine the base number of the oil.

For motor oil color is distributed in the reference scale as follows: yellow - less than 1.5 mg KOH/g; green - 1.7-2.5 mg KOH/g; blue - more than 3 mg KOH/g

Discoloration is fast and well-visible color transition. If solvent is added, for example, 1 ml, that is 16.6% of the total volume of the mixture, the process discoloration is slow, and the color transition less noticeable. If solvent is added, for example, 3 ml, there is a 37.5%, a large amount of the emulsion to the defence which takes a long time.

The method of determining the base number of motor oils by treating drip oil sample with a mixture of distilled water and solvent in the presence of the indicator with the subsequent comparison of the staining mixture of pattern, characterized in that the analyzed drip the oil sample is introduced into a mixture consisting of (711)% distilled water and (291)% solvent, whereby the solvent consists of 50% toluene and 50% isopropanol, and as an indicator of use filter paper of "blue ribbon impregnated with 0.5% aqueous solution baltimoore blue.

 

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