Patent US3950375A successfully refreshed from Google Patents.
US3950375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous manufacture of peroxydicarbonates
Assignee: Arkema Inc
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Filing: 1973-12-10
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Granted: 1976-04-13
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Expires: 1993-12-10
Abstract
Abstract A continuous solvent-free process for the manufacture of peroxydicarbonates from chloroformate, hydrogen peroxide and alkali metal hydroxide utilizing at least two reactors and a centrifuge to separate high purity product.
Inventors
- 👤 Peter M. McKee
- 👤 Uday D. Wagle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:27
CPC Classifications
C; C07; C07C; C07C407/00; C07C407/003
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
86 words
In a process for the continuous manufacture of peroxydicarbonate, RO-C(O)-OO-C(O)-OR wherein R is alkyl of 2-16 carbons, by continuously reacting chloroformate, RO-C(O)-Cl, with hydrogen peroxide and aqueous alkali metal hydroxide at a temperature in the range of -10° C. to + 50°C. in at least two reaction zones connected in series, the improvement which comprises isolating peroxydicarbonate product in at least 97% purity by continuously feeding a solvent-free reaction mixture from the last of said reaction zones directly through a centrifuge to recover the organic phase.
Claim 2
Dependent Claim
86 words
In a process for the continuous manufacture of peroxydicarbonate, RO-C(O)-OO-C(O)-OR wherein R is alkyl of 2-16 carbons, by continuously reacting chloroformate, RO-C(O)-Cl, with hydrogen peroxide and aqueous alkali metal hydroxide at a temperature in the range of -10° C. to + 50°C. in at least two reaction zones connected in series, the improvement which comprises isolating peroxydicarbonate product in at least 97% purity by continuously feeding a solvent-free reaction mixture from the last of said reaction zones directly through a centrifuge to recover the organic phase.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein R is alkyl of 3-8 carbons and said centrifuge is a liquid-liquid centrifuge.
Claim 4
Dependent Claim
9 words
The process of claim 2 wherein R is isopropyl.
Claim 5
Dependent Claim
10 words
The process of claim 2 wherein R is secondary butyl.
Claim 6
Dependent Claim
9 words
The process of claim 2 wherein R is n-propyl.
Claim 7
Dependent Claim
48 words
The process of claim 1 which further comprises continuously mixing the isolated organic phase with saturated salt solution in a mixing zone and isolating peroxydicarbonate product of at least 98% purity by continuously feeding the mixed organic phase-salt solution through a second centrifuge to recover the organic phase.
Claim 8
Dependent Claim
18 words
The process of claim 6 wherein R is alkyl of 3-8 carbons and both centrifuges are liquid-liquid centrifuges.
Claim 9
Dependent Claim
9 words
The process of claim 7 wherein R is isopropyl.
Claim 10
Dependent Claim
10 words
The process of claim 7 wherein R is secondary butyl.
Claim 11
Dependent Claim
9 words
The process of claim 7 wherein R is n-propyl.
Claim 12
Dependent Claim
46 words
The process of claim 6 which further comprises continuously passing the organic phase recovered from the second centrifuge through a stripping zone where the organic phase is subjected to stripping with dry oxygen-containing gas in a column and recovering peroxydicarbonate product of at least 99% purity.
Claim 13
Dependent Claim
18 words
The process of claim 11 wherein R is alkyl of 3-8 carbons and both centrifuges are liquid-liquid centrifuges.
Claim 14
Dependent Claim
9 words
The process of claim 12 wherein R is isopropyl.
Claim 15
Dependent Claim
10 words
The process of claim 12 wherein R is secondary butyl.
Claim 16
Dependent Claim
9 words
The process of claim 12 wherein R is n-propyl.
References Cited (Backward Citations)
US3377373A
Cited
US3429910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |