US4026791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of aqueous waste
Assignee: MW Kellogg Co
•
Filing: 1975-10-02
•
Granted: 1977-05-31
•
Expires: 1995-10-02
Abstract
Abstract In the process of producing phenol from cumene, aqueous waste streams result which are contaminated with organic materials, particularly phenol, which are made innocuous to the environment only with substantial difficulty. A process is described to reduce the biological oxygen demand of these aqueous wastes, particularly the phenol content, by a liquid extraction step whereby a highly aromatic fraction of an organic waste stream in the phenol process is used as the solvent. The process includes provision for simultaneous preparation and recovery of the solvent as well as recovery of the phenol.
Inventors
- 👤 James Edward Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:34
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/70; C07C37/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
In a process for producing phenol from cumene, an improved method for preparing a lean solvent for reducing the biological oxygen demand and phenol content of aqueous waste contaminated with organic materials from the process by liquid-liquid extraction, which comprises the steps of: (a) fractionating in a single column a mixture of a organic waste stream indigenous to the phenol process boiling between alpha-methyl styrene and acetone and the rich solvent stream from the extraction of said aqueous waste; (b) recovering (1) a side stream lean solvent cut which principally contains ethylbenzene and cumene substantially free of oxygen-containing organic compounds, (2) an overhead stream containing light organic materials and (3) a bottoms stream containing heavy organic materials including phenol; and (c) contacting said aqueous waste in an extraction system with said lean solvent cut from (1).
Claim 2
Dependent Claim
136 words
In a process for producing phenol from cumene, an improved method for preparing a lean solvent for reducing the biological oxygen demand and phenol content of aqueous waste contaminated with organic materials from the process by liquid-liquid extraction, which comprises the steps of: (a) fractionating in a single column a mixture of a organic waste stream indigenous to the phenol process boiling between alpha-methyl styrene and acetone and the rich solvent stream from the extraction of said aqueous waste; (b) recovering (1) a side stream lean solvent cut which principally contains ethylbenzene and cumene substantially free of oxygen-containing organic compounds, (2) an overhead stream containing light organic materials and (3) a bottoms stream containing heavy organic materials including phenol; and (c) contacting said aqueous waste in an extraction system with said lean solvent cut from (1).
References Cited (Backward Citations)
US2824049A
Cited
US2824048A
Cited
US2683752A
Cited
US2812305A
Cited
US2737480A
Cited
US2807654A
Cited
US2927075A
Cited
US3180897A
Cited
US3467721A
Cited
US3963610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |