Patent US2743219A successfully refreshed from Google Patents.
US2743219A
Expired / Lapsed
US
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Process for recovery of hydrochloric acid from wood sugar solutions
Assignee: BERGIN AG DEUTSCHE
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Filing: 1951-07-18
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Granted: 1956-04-24
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Expires: 1971-07-18
Abstract
No abstract record available.
Inventors
- 👤 Riehm Theodor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:39
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A PROCESS FOR THE RECOVERY OF ABOUT 40% HYDROCHLORIC ACID FROM AN ACID SUGAR SOLUTION PRODUCED BY THE SACCHARIFICATION OF LIGNIN-CONTAINING CELLULOSIC MATEIALS WITH SAID ACID, WHICH COMPRISES REMOVING FROM SAID SUGAR SOLUTION FIRST SUBSTANTIALLY PURE HYDROGEN CHLORIDE GAS BY A DISTILLATION UNDER REDUCED PRESSURE, AND SUBSEQUENTLY REMOVING BY A SECOND DISTILLATION STEP UNDER REDUCED PRESSURE 25 TO 35% HYDROCHLORIC ACID VAPORS, COOLING SAID VAPORS, THEREBY OBTAINING AN AQUEOUS 25 TO 35% HYDROCHLORIC ACID, AND ENRICHING SAID HYDROCHLORIC ACID WITH SAID HYDROGEN CHLORIDE GAS AT ATMOSPHERIC PRESSURE TO THE ORIGINAL CONCENTRATION OF ABOUT 40%.
Claim 2
Dependent Claim
94 words
A PROCESS FOR THE RECOVERY OF ABOUT 40% HYDROCHLORIC ACID FROM AN ACID SUGAR SOLUTION PRODUCED BY THE SACCHARIFICATION OF LIGNIN-CONTAINING CELLULOSIC MATEIALS WITH SAID ACID, WHICH COMPRISES REMOVING FROM SAID SUGAR SOLUTION FIRST SUBSTANTIALLY PURE HYDROGEN CHLORIDE GAS BY A DISTILLATION UNDER REDUCED PRESSURE, AND SUBSEQUENTLY REMOVING BY A SECOND DISTILLATION STEP UNDER REDUCED PRESSURE 25 TO 35% HYDROCHLORIC ACID VAPORS, COOLING SAID VAPORS, THEREBY OBTAINING AN AQUEOUS 25 TO 35% HYDROCHLORIC ACID, AND ENRICHING SAID HYDROCHLORIC ACID WITH SAID HYDROGEN CHLORIDE GAS AT ATMOSPHERIC PRESSURE TO THE ORIGINAL CONCENTRATION OF ABOUT 40%.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |