THE IMPORTANCE OF THE EXPERIMENTAL-DETERM INATION OF PHYSICAL DATA UNDER HIGH-PRESSURE - PRESENTED ON THE EXAMPLE OF SELECTION OF LUBRICANTS FOR HIGH-PRESSURE COMPRESSORS

Equipments for the experimental determination of p-V-T-data, viscositi es and phase behaviour of gases, liquids, melts and their mixtures up to 250-degrees-C and 4000 bar are described. On the example of a prope r selection of a lubricant for the compressors used in high pressure e thylene polymerization it is shown, that for this aim will be a necess ary condition the knowledge of such data as p.T-dependence of viscosit y and cloud points or solubilities of lubricants in ethylene or ethyle ne-vinylacetate mixtures.