Patent US3200148A successfully refreshed from Google Patents.
US3200148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urea synthesis process
Assignee: Chemical Construction Corp
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Filing: 1962-08-29
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Granted: 1965-08-10
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Expires: 1982-08-29
Abstract
No abstract record available.
Inventors
- 👤 Lucien H Cook
- 👤 Mavrovic Ivo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:38
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/02; C07C273/04; Y; Y02; Y02P; Y02P20/00; Y02P20/141; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
186 words
UREA SYNTHESIS PROCESS WITH TOTAL RECYCLE OF UNCONVERTED PROCESS COMPONENTS WHICH COMPRISES COMPRESSING INPUT STREAMS OF AMMONIA AND CARBON DIOXIDE TO UREA SYNTHESIS PRESSURE IN THE RANGE OF 2000 P.S.I.G. TO 6000 P.S.I.G., COMBINING SAID INPUT STREAMS WITH A GASEOUS RECYCLE STREAM WHEREBY SAID RECYCLE STREAM IS QUENCHED AND A COMBINED UREA SYNTHESIS STREAM IS FORMED AT A TEMPERATURE IN THE RANGE OF 350*F. TO 500*F., COOLING SAID COMBINED STREAM IN HEAT EXCHANGE WITH LIQUID WATER TO A TEMPERATURE IN THE RANGE OF 300*F. TO 400*F., WHEREBY SAID WATER IS CONVERTED TO STEAM AND A PORTION OF SAID COMBINED STREAM IS CONVERTED TO UREA, HEATING THE RESULTING STREAM AT REDUCED PRESSURE TO DECOMPOSE AMMONIUM CARBOMATE, REMOVING OFF-GAS COMPRISING UNCONVERTED AMMONIA AND CARBON DIOXIDE TOGETHER WITH WATER VAPOR, RECOVERING A FINAL PROCESS STREAM COMPRISING PRODUCT AQUEOUS UREA SOLUTION, COMPRESSING SAID OFFGAS IN SUBSTANTIALLY ADIABATIC COMPRESSION MEANS TO UREA SYNTHESIS PRESSURE IN THE RANGE OF 2000 P.S.I.G. TO 6000 P.S.I.G. WHEREBY SAID STREAM IS HEATED TO A TEMPERATURE IN THE RANGE OF 600*F. TO 1000*F., AND RECYCLING THE COMPRESSED STREAM TO UREA SYNTHESIS AS SAID GASEOUS RECYCLE STREAM.
Claim 2
Dependent Claim
186 words
UREA SYNTHESIS PROCESS WITH TOTAL RECYCLE OF UNCONVERTED PROCESS COMPONENTS WHICH COMPRISES COMPRESSING INPUT STREAMS OF AMMONIA AND CARBON DIOXIDE TO UREA SYNTHESIS PRESSURE IN THE RANGE OF 2000 P.S.I.G. TO 6000 P.S.I.G., COMBINING SAID INPUT STREAMS WITH A GASEOUS RECYCLE STREAM WHEREBY SAID RECYCLE STREAM IS QUENCHED AND A COMBINED UREA SYNTHESIS STREAM IS FORMED AT A TEMPERATURE IN THE RANGE OF 350*F. TO 500*F., COOLING SAID COMBINED STREAM IN HEAT EXCHANGE WITH LIQUID WATER TO A TEMPERATURE IN THE RANGE OF 300*F. TO 400*F., WHEREBY SAID WATER IS CONVERTED TO STEAM AND A PORTION OF SAID COMBINED STREAM IS CONVERTED TO UREA, HEATING THE RESULTING STREAM AT REDUCED PRESSURE TO DECOMPOSE AMMONIUM CARBOMATE, REMOVING OFF-GAS COMPRISING UNCONVERTED AMMONIA AND CARBON DIOXIDE TOGETHER WITH WATER VAPOR, RECOVERING A FINAL PROCESS STREAM COMPRISING PRODUCT AQUEOUS UREA SOLUTION, COMPRESSING SAID OFFGAS IN SUBSTANTIALLY ADIABATIC COMPRESSION MEANS TO UREA SYNTHESIS PRESSURE IN THE RANGE OF 2000 P.S.I.G. TO 6000 P.S.I.G. WHEREBY SAID STREAM IS HEATED TO A TEMPERATURE IN THE RANGE OF 600*F. TO 1000*F., AND RECYCLING THE COMPRESSED STREAM TO UREA SYNTHESIS AS SAID GASEOUS RECYCLE STREAM.
References Cited (Backward Citations)
US1429483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-09 | 1969-02-08 | 1969-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-09 | 1973-02-08 | 1973-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-09 | 1977-02-08 | 1977-08-10 | $7700.00 | Window Closed / Lapsed |