Features of express control of volatile hydrocarbon media and their mixtures in visible light

The problems that arise during the express control of hydrocarbon media and their mixtures are considered. Especially noted the problems with the control of volatile hydrocarbon media that are used as fuel (gasoline, kerosene, diesel fuel, etc.). The requirements to the methods for express control and devices for their implementation are defined. The features of control of volatile hydrocarbon media and their mixtures using small-size refractometers working on the effect of total internal reflection are considered. It is shown that when using these devices, it is impossible to obtain data to determine the state of the mixture of volatile hydrocarbon media, its composition and the concentration of the components. A new method for determining the components in the mixture of volatile hydrocarbon media and data on the ratio between the concentrations of the components in it has been developed. The design of a small-size refractometer, which makes it possible to measure the refractive index in visible light, for the implementation of this method is presented. The dependences of the density change on the temperature T for different grades of gasoline for determining the composition and concentration in a three-component mixture of volatile hydrocarbon media have been established. The results of studies of various volatile hydrocarbon media and their mixtures are presented.