Patent ID: 7537700
Filing Date: 2009-05-26
Classification: B01D,C10F,F26B

Abstract:
1. A method for removing water contained in a solid using a liquefied material, comprising the steps of: pressurizing a material D in at least one compressor, the material D being a gas at 25° C. under 1 atm. to produce a liquefied material D; the pressurizing step including condensing the material D in a condenser that is linked to a vaporizer for heat exchange between the condenser and the vaporizer, so that a latent heat of evaporation of the material D is transferred to the vaporizer; contacting a solid containing water with the liquefied material D; allowing the liquefied material D to dissolve the water contained in the solid, and producing a liquefied material D having a high water content and simultaneously removing the water from the solid; vaporizing the material D from the liquefied material D having a high water content in the vaporizer, to thereby separate the water from the resulting gaseous material D; the vaporizing step including passing the material D to an expander that is operatively connected to the at least one compressor for expansion of the material D to create work in the expander that is transferred to the at least one compressor for at least partly powering the at least one compressor; recovering the separated gaseous material D; liquefying the recovered gaseous material by pressurizing, cooling or a combination thereof, to reuse the resulting liquefied material D for removing water from a solid containing water; and wherein the material D contains dimethyl ether.