Solid Deposition in Hydrocarbon Systems: Kinetics and Thermodynamics of GasHydrate Formation. Final Report, 1991-1995

摘要

During the five years of the project, experimental hydrate equilibrium data forpropane, carbon dioxide, hydrogen sulphide and their mixtures have been obtained in several aqueous solutions containing electrolytes and/or solvents like methanol and ethylene glycol. In addition, a literature discrepancy related to propane hydrate data in 10% NaCl solution has been resolved by obtaining fresh experimental data with two different experimental procedures and by comparing the experimental data with predictions using a thermodynamically rigorous method. A number of thermodynamic models for systems containing mixed solvents and electrolytes were reviewed. Of these, two models were integrated with a hydrate prediction method. One model was found to be satisfactory for engineering calculations. Experimental kinetic data on hydrate nucleation were successfully modelled. A unified approach for describing the kinetics of hydrate nucleation, growth and decomposition was presented.