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Patent US4334095A successfully refreshed from Google Patents.
US4334095A
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Extraction of organic acids from aqueous solutions
Assignee: Haarmann and Reimer Corp
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Filing: 1980-10-06
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Granted: 1982-06-08
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Expires: 2000-10-06
Abstract
Abstract Organic acids, such as citric acid, malic acid and lactic acid, can be extracted from aqueous solutions thereof by contacting such solutions with a mixture of a water immiscible amine and a water immiscible organic acid dissolved in a suitable water immiscible solvent.
Inventors
- 👤 Avraham M. Baniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:11
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/11; C07C; C07C51/00; C07C51/42; C07C51/48; C07F9/025
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
53 words
A process for the extraction of an organic acid selected from the class consisting of citric acid, malic acid and lactic acid from an aqueous solution thereof which comprises contacting such solution with a mixture of a water immiscible amine and a water immiscible organic acid dissolved in a suitable water immiscible solvent.
Claim 2
Dependent Claim
53 words
A process for the extraction of an organic acid selected from the class consisting of citric acid, malic acid and lactic acid from an aqueous solution thereof which comprises contacting such solution with a mixture of a water immiscible amine and a water immiscible organic acid dissolved in a suitable water immiscible solvent.
Claim 3
Dependent Claim
19 words
A process according to claim 1 wherein the water immiscible amine contains at least 12 carbon atoms in aggregate.
Claim 4
Dependent Claim
19 words
A process according to claim 1 wherein the water immiscible amine contains at least 20 carbon atoms in aggregate.
Claim 5
Dependent Claim
13 words
A process according to claim 1 wherein the water immiscible amine is trilaurylamine.
Claim 6
Dependent Claim
30 words
A process according to claim 1 wherein the water immiscible organic acid is selected from the class consisting of carboxylic acids, alkylphosphoric acids, alkylphosphonic acids, and halogen substituted derivatives thereof.
Claim 7
Dependent Claim
39 words
A process according to claim 1 wherein the water immiscible organic acid is selected from the class consisting of oleic acid, diethylhexyl phosphoric acid, 2-bromohexanoic acid, linoleic acid, octanoic acid, 2-bromolauric acid and an aliphatic substituted cyclopentyl carboxylic acid.
Claim 8
Dependent Claim
20 words
A process according to claim 1 wherein the molar proportion of amine:organic acid is from about 0.8:1 to about 1.2:1.
Claim 9
Dependent Claim
36 words
A process according to claim 1 wherein the suitable water immiscible solvent is selected from the class consisting of aliphatic hydrocarbons, aromatic hydrocarbons, petroleum fractions, hydrocarbons carrying nitro or halo substituents, alcohols, ketones and mixtures thereof.
Claim 10
Dependent Claim
19 words
A process according to claim 1 carried out at a temperature from about 20° C. to about 80° C.
Claim 11
Dependent Claim
33 words
A process according to claim 1 wherein the water immiscible solvent mixture is then contacted with water to back-extract and recover the extracted organic acid at the same temperature as the initial extraction.
References Cited (Backward Citations)
US4082788A
Cited
US3944606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |