US3981798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid/liquid extraction using certain ethers and esters
Assignee: ChampionX LLC
•
Filing: 1975-05-05
•
Granted: 1976-09-21
•
Expires: 1995-05-05
Abstract
Abstract A process for the liquid/liquid extraction of aromatic hydrocarbons from organic solvent mixtures containing aromatic and aliphatic hydrocarbons by the use of certain ethers and esters as extractants is disclosed.
Inventors
- 👤 Donald G. Ries
- 👤 David G. Braithwaite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:01
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
A process for the liquid/liquid extraction of aromatic hydrocarbons from organic solvent mixtures which comprises the steps of: A. contacting the organic solvent mixture with an extractant selected from the group consisting of mono-methylether of glycerine, monoethylether of glycerine and a mixture of glycerine monoacetate and glycerine diacetate in a volume ratio to the solvent mixture of from 1:10 to 10:1; B. mixing the extractant with the organic solvent mixture for a period of time necessary to extract substantially all of the aromatic hydrocarbons into the extractant; C. separating the extractant containing aromatic hydrocarbons from the organic solvent mixture; D. recovering the aromatic hydrocarbons from the extractant.
Claim 2
Dependent Claim
107 words
A process for the liquid/liquid extraction of aromatic hydrocarbons from organic solvent mixtures which comprises the steps of: A. contacting the organic solvent mixture with an extractant selected from the group consisting of mono-methylether of glycerine, monoethylether of glycerine and a mixture of glycerine monoacetate and glycerine diacetate in a volume ratio to the solvent mixture of from 1:10 to 10:1; B. mixing the extractant with the organic solvent mixture for a period of time necessary to extract substantially all of the aromatic hydrocarbons into the extractant; C. separating the extractant containing aromatic hydrocarbons from the organic solvent mixture; D. recovering the aromatic hydrocarbons from the extractant.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the aromatic hydrocarbons contained in the extractant are recovered by distillation.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein the extractant is a mixture of glycerine monoacetate and glycerine diacetate in the ratio of 1:2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |