Speed of sound, density, and compressibility of petroleum fractions from ultrasonic measurements under pressure

The speed of sound in a synthetic and a real distillation cut has been meas ured up to p = 150 MPa in the temperature range T = (293.15 to 373.15) K. T he synthetic system, which is representative of distillation cuts, is made up of five components with high boiling point temperatures of about T-b = 5 23 K belonging to essential chemical families found in natural fluids {iso, or n-paraffins, naphthenes, and aromatics (alkybenzene, or alkylnaphtalene )}. The distillation cut comes from the separation of a standard crude oil by distillation around T = 523 K. The measurements allow the evaluation of various thermophysical properties such as densities, and isentropic and iso thermal compressibilities up to p = 150 MPa with the help of additional den sity measurements performed at atmospheric pressure. (C) 1999 Academic Pres s.