Patent ID: 6364523
Filing Date: 2002-04-02
Classification: G01N

Abstract:
An ebulliometric device for measuring with high precision a physical parameter of liquid substances, comprising at least one ebulliometer including an elongate vessel into which a liquid substance is fed, means for boiling the liquid, a means for measuring the boiling-point temperature arranged in the upper part of the vessel, a pumping means allowing to spray substance in the form of liquid and vapour in the upper part of the vessel, means external to the vessel for condensation of the vapour allowing to recycle it to the base of the vessel, characterized in that it comprises a first tube in which temperature measuring means is located in the upper part of the vessel, a second tube delimiting a containment space around said first tube, this space communicating with said pumping means, a means associated with said first tube for increasing the liquid/vapour contact time in the containment space, means for homogenizing the boiling temperature and at least one thermostat-controlled enclosure, a device characterized in that it comprises two identical ebulliometers into which two liquids are respectively fed, one being a solvent, the other a solution of a solute in this solvent, a means (V) for measuring the difference between the temperatures respectively prevailing in the containment spaces delimited by second tubes of the two ebulliometers, and a means (&mgr;P) for determining the molar mass of the solute from the measured temperature difference characterized in that said means for condensing the vapour in each ebulliometer comprise a circuit external to vessel, suited to recycle the condensed liquid by thermosiphoning, this circuit communicating by means of a refrigerating column with a pressure and discharge system.