Abstract: A combined desalinization and extraction process for brinewater having a salinity of 71/2% to 9%. The brinewater is introduced to a concentrator basically similar to a shell-and-tube type heat exchanger vertically arranged with upper and lower chambers above and below the tube section and communicating with each other through the tubes. A heating element in the lower chamber causes the brinewater to be heated until it reaches its boiling temperature. Vapors are removed from the upper chamber and are externally compressed so as to create a partial vacuum in the upper chamber. The compressed vapors are passed from the compressor to the concentrator into the spaces on the outside of the tubes where the vapors are condensed as liquid water. The condensed fresh water on the outside of the tubes is removed. The remaining brinewater within the tubes, which is concentrated at 28% salinity, is conducted to a plurality of electrolytic cells having positively charged anodes and negatively charged cathodes.