Method of composition justification of reference materials of motor fuels performance properties

Abstract

At present, there are practically no reference materials for values characterizing the beneficial effect of the use of petroleum products, which reduces the efficiency of the metrological assurance processes for petroleum products testing. In particular, certification by the method of monitoring technical characteristics is an ineffective procedure for a number of motor sets and benches. It is necessary to assess the stability of such testing equipment relative to the s TABLE characteristics of any substance or material.Reference materials of motor fuels performance properties must comply with the requirements for the adequacy of the chemical composition of RM and motor fuels and guaranteed reproducibility of the values during the subsequent manufacture of a new batch of the reference material. In addition, reference materials should reproduce the values characteristic of a particular brand of commercial motor fuel or production technology.It was necessary to develop a method for justification of the composition of reference materials of motor fuels performance properties to meet the above requirements. The method includes the following stages: determination of the characteristic hydrocarbon composition of commercial motor fuels, selection of individual hydrocarbons of various groups, verification of their composition and basic physical and chemical properties, study of the most characteristic values of the investigated performance property and establishment of requirements for a possible measurement range of the certified value, measurement of the certified value for each individual hydrocarbon to be added to the composition of the reference material, development of a mathematical model «The composition of the mixture of individual hydrocarbons - The value of the motor fuel performance property» using experimental planning methods, calculation of the values of the concentrations of individual hydrocarbons in the mixture, providing the required certified value, experimental verification of the value of the certified characteristic of the performance property for the mixture with calculated values of the concentrations of individual hydrocarbons, correction of the calculated concentrations of individual hydrocarbons.The efficiency of the developed method is shown by the example of justification of the reference material composition of jet fuel chemical stability.