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US5030778A
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Decabromodiphenyl alkane process
Assignee: Albemarle Corp
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Filing: 1990-06-04
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Granted: 1991-07-09
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Expires: 2010-06-04
Abstract
Abstract This invention relates to a process for producing a product which is predominant in decabromodiphenyl alkane.
Inventors
- 👤 George H. Ransford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:41
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/10; C07C17/12; C07C25/00; C07C25/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
96 words
A process for preparing a decabromodiphenyl alkane, which process comprises: (a) charging a reaction vessel with a bromination catalyst and liquid elemental bromine; (b) feeding liquid diphenylalkane to the reaction vessel at a point which is beneath the level of the charged liquid bromine, the liquid diphenylalkane being fed in an amount which provides from about 0.055 to about 0.033 moles of diphenylalkane per mole of elemental bromine initially charged; and (c) maintaining the reaction mass at a temperature within the range of from about 30° C. to about 80° C. during the liquid diphenylalkane feed.
Claim 2
Dependent Claim
96 words
A process for preparing a decabromodiphenyl alkane, which process comprises: (a) charging a reaction vessel with a bromination catalyst and liquid elemental bromine; (b) feeding liquid diphenylalkane to the reaction vessel at a point which is beneath the level of the charged liquid bromine, the liquid diphenylalkane being fed in an amount which provides from about 0.055 to about 0.033 moles of diphenylalkane per mole of elemental bromine initially charged; and (c) maintaining the reaction mass at a temperature within the range of from about 30° C. to about 80° C. during the liquid diphenylalkane feed.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the diphenylalkane is diphenylethane.
Claim 4
Dependent Claim
29 words
The process of claim 1 wherein the liquid diphenylalkane is fed in an amount which provides from about 0.05 to about 0.35 moles of diphenylalkane per mole of bromine.
Claim 5
Dependent Claim
31 words
The process of claim 1 wherein the reaction mass is maintained at a temperature in the range of from about 50° C. to about 60° C. during the liquid diphenylalkane feed.
Claim 6
Dependent Claim
37 words
The process of claim 1 wherein water is added to the reaction mass to deactivate the bromination catalyst, the water addition being effected within one hour of the at least substantial completion of the liquid diphenylalkane feed.
Claim 7
Dependent Claim
27 words
The process of claim 1 wherein the liquid diphenylalkane is fed at a point which is about one-half inch below the level of the charged liquid bromine.
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) | 1994-07-08 | 1995-01-07 | 1995-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-08 | 1999-01-07 | 1999-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-08 | 2003-01-07 | 2003-07-09 | $7700.00 | Window Closed / Lapsed |