SU1121614A1 - Method of determination of oxidation inhibitor wearability in lubrication oils - Google Patents

Abstract

THE METHOD FOR DETERMINING THE SRABASHZAEG-JUST OXIDATION INHIBITORS IN THE MEDICINAL SOIL AND OILS by dissolving T-Aveski of the oil to be analyzed in the org-a; -; Other solvent, adding an azobiscozobutyronitrile initiator, measuring the absorbed oxygen in the; 1I followed, with an assessment of the functioning of the inhibitors, about tl and a and y with the fact that, wholly G, from over 1, and sensitivity and accuracy; of the method, isopropylbenzene is used as a solvent and, in parallel, the induction period and oxidation rate of fresh and working oil in isopropylbenzene are determined, followed by an evaluation of the response (Cp) using the formula Cp (w4-l -.oo.EtilidJnHHj, where (iDr, 1о sfxheKTHBHbix concentrations of inhibitors in fresh oil. -, kg with Kj, Hj. - the sum of effective concentrations of inhibitors in the working LS,;::, iK-j is the parameter characterizing the EH of inhibition of inhibinization, l O5 4 mol, g K - const speed, inhibition l mol, s - coefficient and inhibition.

Description

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YL; -: DSv: r4, v: -r- D -; iOCTH levels of locking caps per unit time,; -mn. Build a graph of the volume absorbed; oxygen oxygen from Bree; -: en (Fig. 1), defined. total period -1duk 1H C. which sets: the action time of the bag of all inhibitors is 47 minutes. The total period of induction is determined graphically from the general kinetic curve of the oxidation of isogphopilbeksol in the presence of an additive of the oil to be analyzed. The value of L is determined by the coordinate of the point of intersection of two straight lines for which the tangents of tilt angles are related by the ratio tg5i, 2 tp. The first of these straight lines is a continuation of the linear portion of the kinetic oxygen absorption curve after the complete use of inhibitors. The second straight line is tangent to the kinetic curve at the point for which the reaction rate is two times lower than the reaction rate after the inhibitors are consumed. The error in finding b is determined by the ratio of the initial and final oxidation rates of the analyzed mixture. Processing of numerous experimental data shows that the relative error of such an i-determination is 5-8%. However, they take into account not the value 47 min and 2 microns less, t, e, 45 MHHj - the warm-up time by the reaction of the mixture. The warm-up time is determined by the equilibrium, and by the equality of the temperature of the heat-transfer agent in the thermostat and the reaction mixture. Direct measurement of the temperature in the reaction vessel using a thermometer showed that for the reaction mixture with a volume of 10 cm, the temperature was set at 1.5 minutes. Practically, it is convenient to record the warm-up time of the reaction mixture at the time when the expansion of the gas in the measuring burette ends, i.e. visually, at the moment when the liquid level of the liquid in the measuring burette stops, which in all cases lasted no more than 1.5 minutes, very dilute solutions are used in the proposed method; Assuming that the oil has a density of 0.8 g / cm; then 40 mg is added to make up a volume of 0.05 cm. The total volume of the mixture is 10 cm5 i.e. 200-fold dilution. Coefficient teploprozod ost; The difference in organic 144 liquids varies within narrow limits (0.2-0.7). 10 cal / cm hail. Under the conditions of such dilution, the change in total thermal conductivity resulting from the addition of oil is reduced by another two orders of magnitude. Therefore, the warm-up time is practically independent of the type of additive being analyzed. Then, a graph of the amount of absorbed oxygen, VQ, ml, versus -Igd-t /) -Lig is constructed. 1q. The concentration of absorbed oxygen is determined in accordance with the universal gas law: 1 mol 22.4 l, 1 MP oxygen under normal conditions gives a concentration of 4.09-10 mol / l 298. 22.4 10 taking into account the volume of the reaction mixture 10 ml. As a result, only the initial value of the IPB concentration is used in the calculation, it is more convenient to use the prepared Oil coefficient .09 10 mol / l Vpi t 7.14 MOP / l 5.73-10 Initial concentration of the IPB pRHi - P-- - i I .. o Ш120, 2 7.14 mol l / l p 0.859 g / cm3, MM 120.2. This dependency () consists of several sections, each of which represents a straight line. The number of inhibitor types is determined by the number of sites on the semi-log anamorphase (in this example there are two). The induction period for each inhibitor is determined by the kgg coordinate of the break point on the semi-log anamorphosis, i.e. / ,, 10 min, t2 35 G. EDN. The content of inhibitors lf, Hl (mol / kg) and the inhibition ratio f are determined from the i-D ratio. the initiation rate is 6.8–10 mol / l; P is the weight of the oil, is 21 mg. The initiation of the cumene oxidation reaction in this example carried out ™ 7 multicomponent mixtures of entioxidation. analyze them and more accurately describe the reproduction of the complexion. we have the COMPLEX-C antioxidant of additives during the operation of lubricating oils gazlichnyh sites tracks regardless of its composition, purpose and working conditions. The method does not require complex instrumentation, the analysis duration of not more than 1 hour allows working with 1-1-a-sample oil tests of 10-50 mg, which corresponds to the concentration of inhibitors in the oil of 1 5-10 mol / l. detection sensitivity is 0 times higher than in the known method "