Distillation: processes – separatory – Water purification only – Under pressure or vacuum
Patent
1976-12-16
1978-10-24
Bascomb, Jr., Wilbur L.
Distillation: processes, separatory
Water purification only
Under pressure or vacuum
203 22, 203DIG1, 203DIG16, 203DIG20, 202173, 202180, 60648, 60641, B01D 306
Patent
active
041219775
ABSTRACT:
A process for simultaneously generating power and recovering potable water from a source of salinous water -- e.g. sea water. Salinous water, from a locus which is proximate to the surface thereof and at a relatively high temperature -- e.g. about 85.degree. F. -- is increased in temperature via indirect contact with a vaporous phase, derived from the surface water at an elevated temperature and a subatmospheric pressure. The preheated salinous water is exposed to radiant solar energy, in a solar radiation heat sink, to further increase the temperature thereof. Thus-heated salinous water is introduced into a first flash separation zone, maintained at subatmospheric pressure, to provide a first substantially non-salinous vaporous phase and a first salinous liquid phase. The first vaporous phase is passed into and through a turbine, from the resulting motion of which power is generated. The first liquid phase is introduced into a second flash separation zone, maintained at a lower absolute pressure than said first flash zone, to provide a second salinous liquid phase and a second substantially non-salinous vaporous phase. The latter is utilized to preheat the salinous surface water prior to the introduction thereof into the solar radiation heat sink. The second liquid phase is introduced into a third flash separation zone, maintained at a lower absolute pressure than said second flash zone, to provide a third salinous liquid phase and a third substantially non-salinous vaporous phase. Vapors exiting from the turbine and the third vaporous phase are cooled and/or condensed via indirect contact with a second portion of the salinous water, obtained from a locus substantially lower than the surface, and at a comparatively lower temperature -- e.g. about 70.degree. F. -- to recover liquid potable water.
The third salinous liquid phase is returned to the original source of the salinous water, as is the second salinous water portion following its use to condense and/or cool the turbine exit vapors and the third vaporous phase. When returned to the salinous water source, the third salinous liquid phase is preferably at a temperature not more than 15.degree. F. greater than the temperature of the second salinous water portion obtained at the selected depth below the surface.
REFERENCES:
patent: 2006985 (1935-07-01), Claude et al.
patent: 3511756 (1970-05-01), Guerrieri
patent: 3908381 (1975-09-01), Barber et al.
patent: 3928145 (1975-12-01), Othmer
Bascomb, Jr. Wilbur L.
Erickson Robert W.
Hoatson Jr. James R.
Page II William H.
UOP Inc.
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