US3211788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biuret control in urea process
Assignee: Chemical Construction Corp
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Filing: 1962-11-14
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Granted: 1965-10-12
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Expires: 1982-11-14
Abstract
No abstract record available.
Inventors
- 👤 Lucien H Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:40
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/02; C07C273/14; C07C273/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
METHOD OF CONTROLLING BIURET CONCENTRAITON IN A UREA PROCESS WHICH COMPRISES CONCENTRATING AN AQUEOUS SOLUTION OF SYNTHETIC UREA TO FORM A SUBSTANTIALLY ANHYDOUS UREA MELT AT A TEMPERATURE ABOVE 132*C., DISSOLVING AMMONIA INTO SAID UREA MELT AT A PRESSUE ABOVE 200 P.S.I.A. WHEREBY A TWO COMPONENT UREA-AMMONIA SOLUTION IS FORMED AT A TEMPERATURE BELOW 132%C., PASSING SAID SOLUTION TO SOLIDIFICATION MEANS FOR FORMATION OF SOLID UREA PRODUCT, REDUCING THE PRESSURE OF SAID SOLUTION BELOW 50 P.S.I.A. AND SIMULTANEOUSLY HEATING SAID SOLUTION, WHEREBY A MAJOR PORTION OF DISSOLVED AMMONIA IS EVOLVED AND REMOVED AS AN OF-GAS, PASSING AIR THROUGH THE RESIDUAL SOLUTION TO REMOVE THE BALANCE OF DISSOLVED AMMONIA AS A MIXED AIR-AMMONIA GAS STREAM, AND SOLIDIFYING THE RESIDUAL UREA MELT IN SAID SOLIDIFICATION MEANS TO FORM A SOLID UREA PRODUCT SUBSTANTIALLY FREE OF BIURET.
Claim 2
Dependent Claim
134 words
METHOD OF CONTROLLING BIURET CONCENTRAITON IN A UREA PROCESS WHICH COMPRISES CONCENTRATING AN AQUEOUS SOLUTION OF SYNTHETIC UREA TO FORM A SUBSTANTIALLY ANHYDOUS UREA MELT AT A TEMPERATURE ABOVE 132*C., DISSOLVING AMMONIA INTO SAID UREA MELT AT A PRESSUE ABOVE 200 P.S.I.A. WHEREBY A TWO COMPONENT UREA-AMMONIA SOLUTION IS FORMED AT A TEMPERATURE BELOW 132%C., PASSING SAID SOLUTION TO SOLIDIFICATION MEANS FOR FORMATION OF SOLID UREA PRODUCT, REDUCING THE PRESSURE OF SAID SOLUTION BELOW 50 P.S.I.A. AND SIMULTANEOUSLY HEATING SAID SOLUTION, WHEREBY A MAJOR PORTION OF DISSOLVED AMMONIA IS EVOLVED AND REMOVED AS AN OF-GAS, PASSING AIR THROUGH THE RESIDUAL SOLUTION TO REMOVE THE BALANCE OF DISSOLVED AMMONIA AS A MIXED AIR-AMMONIA GAS STREAM, AND SOLIDIFYING THE RESIDUAL UREA MELT IN SAID SOLIDIFICATION MEANS TO FORM A SOLID UREA PRODUCT SUBSTANTIALLY FREE OF BIURET.
References Cited (Backward Citations)
NL95513C
Cited
US2854482A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |