US4548755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the extractive production of valuable natural waxes
Assignee: Evonik Operations GmbH
•
Filing: 1983-02-24
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Granted: 1985-10-22
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Expires: 2003-02-24
Abstract
Abstract Process for the extractive production of valuable, natural waxes from fossil and/or freshly grown vegetable and/or animal starting material by extraction of the starting material in an extraction stage with a physiologically unobjectionable gas at supercritical pressure and temperature conditions, separation of the extract-containing gas in a separator part by pressure reduction and/or temperature change, periodical or continuous withdrawal of the extract and return of the separated gas to the extraction stage.
Inventors
- 👤 Egon Stahl
- 👤 Karl-Werner Quirin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:00
CPC Classifications
C; C11; C11B; C11B11/00; B; B01; B01D; B01D11/00; B01D11/02; B01D11/0203; C10; C10G; C10G73/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
48 words
Process for extractive production of natural wax from starting materials obtained from fossil, vegetable or animal sources, comprising extracting the starting materials with a physiologically unobjectional gas at supercritical pressure and temperature conditions; and, thereafter, separating the extract from the gas by changing the pressure and/or temperature conditions.
Claim 2
Dependent Claim
48 words
Process for extractive production of natural wax from starting materials obtained from fossil, vegetable or animal sources, comprising extracting the starting materials with a physiologically unobjectional gas at supercritical pressure and temperature conditions; and, thereafter, separating the extract from the gas by changing the pressure and/or temperature conditions.
Claim 3
Dependent Claim
31 words
The process of claim 1 wherein the separating step takes place in a separating stage and further comprises removing the gas from the separating stage, for reuse in an extracting step.
Claim 4
Dependent Claim
13 words
The process of claim 1 further comprising comminuting the starting material before extracting.
Claim 5
Dependent Claim
26 words
The process of claim 1 wherein the extraction and/or separation is accomplished in a plurality of stages whereby the wax is recovered as a fractionated product.
Claim 6
Dependent Claim
25 words
The process of claim 4 wherein the plurality of stages is accomplished by a stepwise change in the pressure and/or temperature of the extracting gas.
Claim 7
Dependent Claim
13 words
The process of claim 5 wherein at least two pressure charges are used.
Claim 8
Dependent Claim
50 words
The process of claim 1 wherein the gas is an alkane or alkene of up to three carbon atoms; a partially or fully fluorinated alkane or alkene of up to three carbon atoms; N 2 O; CO 2 ; SF 6 ; Ar; N 2 ; or a mixture thereof.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein the extraction is performed at a pressure of 72 bar to 1000 bar.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein the extraction is performed at a pressure of 300 bar to 800 bar.
Claim 11
Dependent Claim
19 words
The process of claim 1 wherein the extraction is performed at a temperature of 31.4° C. to 150° C.
Claim 12
Dependent Claim
19 words
The process of claim 1 wherein the extraction is performed at a temperature of 50° C. to 80° C.
Claim 13
Dependent Claim
16 words
The process of claim 1 wherein the separation is performed at 40 bar to 150 bar.
Claim 14
Dependent Claim
16 words
The process of claim 1 wherein the separation is performed at 50 bar to 80 bar.
Claim 15
Dependent Claim
16 words
The process of claim 1 wherein the separation is performed at 31.4° C. to 100° C.
Claim 16
Dependent Claim
16 words
The process of claim 1 wherein the separation is performed at 40° C. to 80° C.
Claim 17
Dependent Claim
84 words
The process of claim 1 wherein the gas is an alkane or alkene of up to three carbon atoms; a partially or fully fluorinated alkane or alkene of up to three carbon atoms; N 2 O; CO 2 ; SF 6 ; Ar; N 2 ; or a mixture thereof; the extraction is performed at 72 bar to 1000 bar at 31.4° C. to 150° C.; and the separation is performed at 40 bar to 150 bar and at 31.4° C. to 100° C.
References Cited (Backward Citations)
US2847356A
Cited
US3064018A
Cited
FR1390751A
Cited
US3969196A
Cited
US3684685A
Cited
US3684686A
Cited
US3796651A
Cited
US3923847A
Cited
DE2843920A1
Cited
GB2032789A
Cited
US4280961A
Cited
US4367178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |