US3219678A
Expired / Lapsed
US
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Process for reducing the hydrolyzable chlorine content of organic isocyanates
Assignee: Olin Corp
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Filing: 1963-02-28
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Granted: 1965-11-23
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Expires: 1983-02-28
Abstract
No abstract record available.
Inventors
- 👤 Ehrenfried H Kober
- 👤 Sr Trescott B Larchar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:13
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/18; C07C263/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN THE PROCESS FOR PURIFYING A CRUDE ORGANIC ISOCYANATE BY PASSING AN INERT GAS THROUGH SAID ISOCYANATE TO REMOVE HYDROGEN CHLORIDE AND PHOSGENE CONTAINED THEREIN, DISTILLING, IN A FIRST DISTILLATION STEP, THE RESULTING DEGASSED MATERIAL TO REMOVE SOLVENT CONTAINED THEREIN, AND DISTILLING, IN A SECOND DISTILLATION STEP, THE RESIDUE OF THE FIRST DISTILLATION STEP TO REMOVE THE ORGANIC ISOCYANATE FROM RESIDUAL IMPURITIES, THE IMPROVEMENT WHICH COMPRISES HEATING THE RESIDUE OF THE FIRST DISTILLATION STEP TO A TEMPERATURE IN THE RANGE BETWEEN ABOUT 150* AND ABOUT 300*C. PRIOR TO SAID SECOND DISTILLATION STEP, WHEREBY THE CONCENTRATION OF THE HYDROLYZABLE CHLORIDE IS SUBSTANTIALLY REDUCED.
Claim 2
Dependent Claim
102 words
IN THE PROCESS FOR PURIFYING A CRUDE ORGANIC ISOCYANATE BY PASSING AN INERT GAS THROUGH SAID ISOCYANATE TO REMOVE HYDROGEN CHLORIDE AND PHOSGENE CONTAINED THEREIN, DISTILLING, IN A FIRST DISTILLATION STEP, THE RESULTING DEGASSED MATERIAL TO REMOVE SOLVENT CONTAINED THEREIN, AND DISTILLING, IN A SECOND DISTILLATION STEP, THE RESIDUE OF THE FIRST DISTILLATION STEP TO REMOVE THE ORGANIC ISOCYANATE FROM RESIDUAL IMPURITIES, THE IMPROVEMENT WHICH COMPRISES HEATING THE RESIDUE OF THE FIRST DISTILLATION STEP TO A TEMPERATURE IN THE RANGE BETWEEN ABOUT 150* AND ABOUT 300*C. PRIOR TO SAID SECOND DISTILLATION STEP, WHEREBY THE CONCENTRATION OF THE HYDROLYZABLE CHLORIDE IS SUBSTANTIALLY REDUCED.
References Cited (Backward Citations)
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |