US4180684A
Expired / Lapsed
US
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Process for the production of 4,4-isopropylidene-bis'(2,6-dibromophenol)
Assignee: Evonik Operations GmbH
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Filing: 1977-01-14
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Granted: 1979-12-25
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Expires: 1997-01-14
Abstract
Abstract 4,4'-isopropylidene-bis(2,6-dibromophenol) is produced by reacting 4,4'-isopropylidene diphenol with hydrogen bromide or a mixture of hydrogen bromide with up to an equimolar amount of free bromine in admixture with hydrogen peroxide and in the presence of water and an inert organic liquid.
Inventors
- 👤 Peter Kleinschmit
- 👤 Eberhard Walter
- 👤 Helmut Mechler
- 👤 Gunter Theis
- 👤 Brigitte Meiners
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:00
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/62
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
137 words
A process for the production of pure 4,4'-isopropylidene-bis (2,6-dipromophenol) comprising reacting 4,4'-isopropylidene diphenol with a brominating agent selected from the group consisting of (1) hydrogen bromide and (2) hydrogen bromide containing up to 1 mole of free bromine per mole of hydrogen bromide and at least about 1.0 mole of hydrogen peroxide for each mole total of hydrogen bromide and free bromine in the presence of water and an inert ogranic solvent which has limited miscibility with water so that two liquid phases are present, one phase being a water phase and the other an organic solvent phase, separating the water phase from the organic solvent phase, precipitating 4,4'-isopropylidene-bis (2,6-dibromophenol) from the organic phase to leave a mother liquor and recycling the mother liquor for use as water immiscible solvent in making another batch of 4,4'-isopropylidene-bis (2,6-dibromophenol).
Claim 2
Dependent Claim
137 words
A process for the production of pure 4,4'-isopropylidene-bis (2,6-dipromophenol) comprising reacting 4,4'-isopropylidene diphenol with a brominating agent selected from the group consisting of (1) hydrogen bromide and (2) hydrogen bromide containing up to 1 mole of free bromine per mole of hydrogen bromide and at least about 1.0 mole of hydrogen peroxide for each mole total of hydrogen bromide and free bromine in the presence of water and an inert ogranic solvent which has limited miscibility with water so that two liquid phases are present, one phase being a water phase and the other an organic solvent phase, separating the water phase from the organic solvent phase, precipitating 4,4'-isopropylidene-bis (2,6-dibromophenol) from the organic phase to leave a mother liquor and recycling the mother liquor for use as water immiscible solvent in making another batch of 4,4'-isopropylidene-bis (2,6-dibromophenol).
Claim 3
Dependent Claim
28 words
A process according to claim 1 wherein for each mole of 4,4'-isopropylidene diphenol there is employed about 4.0 to 4.2 gram atoms of bromine in the brominating agent.
Claim 4
Dependent Claim
28 words
A process according to claim 2 wherein for each mole total of hydrogen bromide and free bromine there is employed about 1.0 to 1.2 moles of hydrogen peroxide.
Claim 5
Dependent Claim
17 words
A process according to claim 3 wherein the reaction is carried out at 10 to 90° C.
Claim 6
Dependent Claim
18 words
A process according to claim 2 wherein the solvent is a chlorinated aliphatic hydrocarbon or chlorinated aromatic hydrocarbon.
Claim 7
Dependent Claim
13 words
A process according to claim 5 wherein the solvent is tetrachloroethylene or chlorobenzene.
Claim 8
Dependent Claim
16 words
A process according to claim 2 wherein the brominating agent is employed in aqueous mineral acid.
Claim 9
Dependent Claim
16 words
A process according to claim 7 wherein the mineral acid is sulfuric acid or phosphoric acid.
Claim 10
Dependent Claim
17 words
A process according to claim 2 wherein the brominating agent is hydrogen bromide free of elemental bromine.
Claim 11
Dependent Claim
16 words
A process according to claim 2 wherein the brominating agent is hydrogen bromide containing free bromine.
Claim 12
Dependent Claim
23 words
A process according to claim 1 wherein the solvent is an aliphatic hydrocarbon, aromatic hydrocarbon, a chlorinated aliphatic hydrocarbon or chlorinated aromatic hydrocarbon.
Claim 13
Dependent Claim
18 words
A process according to claim 11 wherein the solvent is a chlorinated aliphatic hydrocarbon or chlorinated aromatic hydrocarbon.
Claim 14
Dependent Claim
28 words
A process according to claim 12 wherein for each mole of 4,4'-isopropylidene diphenol, there is employed about 4.0 to 4.2 gram atoms of bromine in the brominating agent.
Claim 15
Dependent Claim
14 words
A process according to claim 1 wherein the recycling is carried out 10 times.
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) | 1982-12-24 | 1983-06-25 | 1983-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-24 | 1987-06-25 | 1987-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-24 | 1991-06-25 | 1991-12-25 | $7700.00 | Window Closed / Lapsed |