B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
202/79
B01D 7/02 (2006.01) B01D 9/04 (2006.01) C02F 1/22 (2006.01)
Patent
CA 1189014
PETITION, SPECIFICATION AND DECLARATION To the Commissioner of Patents: Your petitioners, Chen-Yen Cheng and Sing-Wang Cheng, citizens of United States and Taiwan respectively, and both residents of Albu- querque, New Mexico, whose post office addresses are both 9605 La Plava St., NE., Albuquerque, New Mexico, 87111 pray that letters patent may be granted to them as joint inventors for the improvement in method and apparatus for separating mixtures set forth in the follow- ing specification. Specification of the Invention Title: Separation of a Mixture by the Vacuum Freezing Vapor Desublimation Desublimate Vaporization Process ABSTRACT OF DISCLOSURE The Vacuum Freezing Vapor Desublimation Desublimate Vaporization Process (denoted as VDDV Process) is an improved vacuum freezing process that is useful in separating solvent from a solution that contains one or more non-volatile solutes. It can be used in desalination of sea water and brackish water, renovation of waste water, and concentration of aqueous and non-aqueous solutions Referring to sea water desalination, the process comprises the following steps: (a) feed sea water is flash vaporized under a reduced pressure to thereby form a first low pressure water vapor (3.5 torr) and an ice-brine slush; (b) the first low pressure water vapor is cooled without pressurization to form a mass of desublimate ; (c) the ice-brine slush is separated into a mass of purified ice and a con- centrated brine; (d) the desublimate is melted and vaporized to form a second low pressure water vapor that is at a pressure higher than - 1 - the triple point pressure of water (4.58 torr); (d) the second low pressure water vapor is brought in contact with the purified ice to thereby condense the vapor and melt the ice. Both the condensate and the melt become product fresh water. The characteristic feature of the process is that a low pressure vapor is pressurized from a first pres- sure that is lower than the triple point pressure to a second pressure that is higher than the triple point pressure by first desubliming the vapor and then melting and vaporizing the desublimate. The need of a low pressure compressor has been eliminated.
414242
Cheng Chen-Yen
Cheng Sing-Wang
Cheng Chen-Yen
Cheng Sing-Wang
R. William Wray & Associates
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