MULTIPHASE PRODUCTION - REPRESENTATION OF THERMODYNAMIC PROPERTIES OFMETHANOL BY DIFFERENT EQUATIONS OF STATE

For oil and gas offshore production, any extension of the Multiphase P roduction Concept to more complex effluents under more difficult trans port conditions, requests a better understanding and control of (a) th e thermodynamic behaviour of water-hydrocarbon mixtures, (b) the effic iency of Various additives (or mixtures of additives), necessary for a safe, reliable and economical operation of the production and transpo rt facilities. One of the main additives used for hydrate control bein g methanol, this paper deals specifically with its thermodynamic prope rties and includes: (a) first, an exhaustive bibliography of experimen tal-data with the method used for the selection of a coherent and reli able data base, (b) then, a comparison of the results obtained, after adjustement on the data base: with various cubic and not-cubic equatio ns of state: Peng-Robinson, Cubic-Chain-Of-Rotators (CCOR), Chain-Of-R otators (COR), as well as with equations of state including methanol a ssociation phenomena (Anderko model, Wenzel and Krop model), (c) and f inally, an empirical Bipolynomial equation of state which represents t he methanol thermodynamic properties with a good accuracy.