US3816266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for making highly pure water
Assignee: Hitachi Ltd
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Filing: 1973-02-15
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Granted: 1974-06-11
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Expires: 1993-02-15
Abstract
Abstract A process and an apparatus for making highly pure water, in which fresh water obtained by the flash evaporation of hot seawater is contacted directly with the vapour resulting from the flash evaporation, whereby said vapour is condensed to form fresh water, and the resultant fresh water is further subjected to flash evaporation to obtain highly pure water.
Inventors
- 👤 K Izumi
- 👤 Z Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:07
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/02; C02F1/04; C02F1/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
42 words
A process for making pure water, according to claim 1, wherein said sea-water is subjected to heat exchange with the resultant steam of said fresh water before it is subjected to said flash evaporation and before heat exchange in the indirect condenser.
Claim 2
Independent Claim
223 words
An apparatus for making pure water, comprising a plurality of vertical casing assemblies each consisting of a combination of a sea-water flash chamber communicating with an indirect condenser for receiving preheated sea-water from said condenser and a fresh water spray condenser chamber communicating with said sea-water flash chamber, another plurality of vertical casing assemblies each consisting of a combination of a multitubular fresh water steam indirect condenser chamber and a fresh water flash chamber communicating with said multitubular fresh water steam Indirect condenser chamber to transmit flashed steam thereto; said fresh water flash chambers and said multitubular fresh water steam condenser chambers being arranged, respectively, in series; a piping communicating cyclically said spray condenser chamber with the final fresh water flash chamber of said series; a piping extending vertically through said multitubular fresh water steam condenser chambers for conveying cold sea-water therein; a piping for feeding sea-water to said sea-water flash chamber therethrough; a piping for bleeding air from all of said chambers; air bleeding means connected to said piping for bleeding air; a brine drain piping for draining brine from said sea-water flash chambers and said piping extending through said multitubular fresh water steam condenser chambers; brine discharge means for conveying concentrated brine to waste; a pure water discharge piping and pure water discharge means for conveying fresh water product to use.
Claim 3
Dependent Claim
39 words
An apparatus for making pure water, according to claim 3, wherein said piping extending vertically in said multitubular fresh water steam condenser chambers is connected to discharge into the top of said sea-water flash chambers via said indirect condenser.
Claim 4
Independent Claim
220 words
An apparatus for making pure water, comprising a vertical casing assembly consisting of a combination of a sea-water flash chamber communicating with an indirect condenser for receiving preheated sea-water from said condenser and a fresh water spray condenser chamber communicating with said sea-water flash chamber, a plurality of vertical casing assemblies each consisting of a combination of a multitubular fresh water steam indirect condenser chamber and a fresh water flash chamber communicating with said multitubular fresh water steam indirect condenser chamber to transmit flashed steam thereto; said fresh water flash chambers and said multitubular fresh water steam condenser chambers being arranged, respectively, in series; a piping communicating cyclically said spray condenser chamber with the final fresh water flash chamber of said series; a piping extending vertically through said multitubular fresh water steam condenser chambers for conveying cold sea-water therein; a piping for feeding sea-water to said sea-water flash chamber therethrough; a piping for bleeding air from all of said chambers; air bleeding means connected to said piping for bleeding air; a brine drain piping for draining brine from said sea-water flash chambers and said piping extending through said multitubular fresh water steam condenser chambers; brine discharge means for conveying concentrated brine to waste; a pure water discharge piping and pure water discharge means for conveying fresh water product to use.
Claim 5
Dependent Claim
39 words
An apparatus for making pure water, according to claim 5, wherein said piping extending vertically in said multitubular fresh water steam condenser chambers is connected to discharge into the top of said sea-water flash chambers via said indirect condenser.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |