Process for the continuous production of boiler feed water

Claim 1

Process for the continuous production of pure water for boiler feed from waste waters containing salt, hydrocarbon and Fe ++ , comprising: mechanically purifying the waters, subjecting the mechanically purified waters to a thermal degassing in a degasser under vacuum in the absence of air, subjecting the resulting thermally degassed waters to spray film evaporation in a spray film tube evaporator by spraying the waters onto the outside surfaces of a heat exchanger to produce vapor, subjecting the resulting produced vapor to a mechanical vapor compression, passing the resulting compressed vapor inside the heating surfaces of the spray film evaporator to condense the vapor inside the heating surfaces, while maintaining the temperature on the outside of the heating surfaces at a lower temperature than the temperature inside the heating surfaces, feeding the condensed water from inside the heating surfaces of the evaporator in the presence of a water vapor- and non-condensable hydrocarbons, removing the condensed water from the separator, and drawing off the non-condensable hydrocarbons from the top of the separator.