US2494325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of furfural from furfural-polymer mixtures
Assignee: Texaco Inc
•
Filing: 1945-03-14
•
Granted: 1950-01-10
•
Expires: 1965-03-14
Abstract
No abstract record available.
Inventors
- 👤 Charles T Anne
- 👤 Roy F Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:27
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/38; C07D307/40; C07D307/46; C07D307/48; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
THE CONTINUOUS METHOD OF RECOVERING FURFURAL FROM A MIXTURE OF FURFURAL AND POLYMER WHICH COMPRISES PASSING TO AN INTERMEDIATE PORTION OF A DISTILLING COLUMN A STREAM OF FURFURAL FEED CONTAINING A SUBSTANTIAL AMOUNT OF POLYMER LIQUID FORMED DURING CONTACT BETWEEN FURFURAL AND C4 OLEFINIC HYDROCARBONS AT ELEVATED TEMPERATURES, SAID POLYMER BEING HIGHER BOILING THEN FURFURAL, PASSING TO THE UPPER PORTION OF SAID TOWER AS REFLUX LIQUID A STREAM OF WATER CONTAINING A SMALL AMOUNT OF A WATER SOLUBLE ALKALI METAL SALT WETTING AGENT, PASSING STEAM TO THE LOWER PORTION OF SAID COLUMN AT AN ELEVATED TEMPERATURE AND IN AN AMOUNT SUFFICIENT TO DISTIL FURFURAL FROM SAID FEED, REMOVING FROM THE TOP OF SAID TOWER A DISTILLATE STREAM CONSISTING ESSENTIALLY OF FURFURAL AND STREAM, AND REMOVING FROM THE BOTTOM OF SAID COLUMN A STREAM OF POLYMER LIQUID SUSPENDED IN WATER.
Claim 2
Dependent Claim
139 words
THE CONTINUOUS METHOD OF RECOVERING FURFURAL FROM A MIXTURE OF FURFURAL AND POLYMER WHICH COMPRISES PASSING TO AN INTERMEDIATE PORTION OF A DISTILLING COLUMN A STREAM OF FURFURAL FEED CONTAINING A SUBSTANTIAL AMOUNT OF POLYMER LIQUID FORMED DURING CONTACT BETWEEN FURFURAL AND C4 OLEFINIC HYDROCARBONS AT ELEVATED TEMPERATURES, SAID POLYMER BEING HIGHER BOILING THEN FURFURAL, PASSING TO THE UPPER PORTION OF SAID TOWER AS REFLUX LIQUID A STREAM OF WATER CONTAINING A SMALL AMOUNT OF A WATER SOLUBLE ALKALI METAL SALT WETTING AGENT, PASSING STEAM TO THE LOWER PORTION OF SAID COLUMN AT AN ELEVATED TEMPERATURE AND IN AN AMOUNT SUFFICIENT TO DISTIL FURFURAL FROM SAID FEED, REMOVING FROM THE TOP OF SAID TOWER A DISTILLATE STREAM CONSISTING ESSENTIALLY OF FURFURAL AND STREAM, AND REMOVING FROM THE BOTTOM OF SAID COLUMN A STREAM OF POLYMER LIQUID SUSPENDED IN WATER.
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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) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |