US4031194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous process for preparing bromine
Assignee: Nissan Chemical Corp
•
Filing: 1976-02-17
•
Granted: 1977-06-21
•
Expires: 1996-02-17
Abstract
Abstract Bromine is continuously produced by simultaneously feeding an aqueous solution of bromide or hydrobromic acid and chlorine gas into the top of a contact tower which is separated into an upper reaction section and a lower distillation section, having a gas outlet port therebetween; and feeding steam from the bottom of the tower whereby free bromine formed in the upper reaction port section and free bromine distilled from the lower distillation tower section are recovered through said bromine outlet port, wherein the aqueous solution containing bromide or hydrobromic acid is heated at lower than 80° C in the reaction section and the solution is heated to higher than 90° C in the distillation section.
Inventors
- 👤 Yoshihisa Ogawa
- 👤 Tsunenori Inazaki
- 👤 Michihiro Kouda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:51
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/09; C01B7/096
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
167 words
A continuous process for the preparation of bromine which comprises: 1. cocurrently introducing an aqueous solution of a bromide or hydrobromic acid and chlorine gas into a contact tower; said contact tower being separated into an upper packed reaction section connected to a middle section having a bromine outlet port which in turn is connected to a lower packed distillation section; said cocurrent introduction being along the axis of said reaction section; wherein the aqueous solution of a bromide or hydrobromic acid is heated to less than 80° C in said reaction section while forming bromine in said aqueous solution; and wherein at least a part of said bromine is removed from the bromine outlet port; and 2. introducing steam into the lower part of said distillation section, thereby countercurrently contacting the aqueous solution descending from step (1) with said steam to heat said aqueous solution in said distillation section to a temperature greater than 90° C, thereby distilling the remaining bromine from the bromine outlet port.
Claim 2
Dependent Claim
167 words
A continuous process for the preparation of bromine which comprises: 1. cocurrently introducing an aqueous solution of a bromide or hydrobromic acid and chlorine gas into a contact tower; said contact tower being separated into an upper packed reaction section connected to a middle section having a bromine outlet port which in turn is connected to a lower packed distillation section; said cocurrent introduction being along the axis of said reaction section; wherein the aqueous solution of a bromide or hydrobromic acid is heated to less than 80° C in said reaction section while forming bromine in said aqueous solution; and wherein at least a part of said bromine is removed from the bromine outlet port; and 2. introducing steam into the lower part of said distillation section, thereby countercurrently contacting the aqueous solution descending from step (1) with said steam to heat said aqueous solution in said distillation section to a temperature greater than 90° C, thereby distilling the remaining bromine from the bromine outlet port.
Claim 3
Dependent Claim
37 words
The continuous process for preparing bromine according to claim 1, wherein Raschig rings are packed in said reaction section and said distillation section but no Raschig rings are packed in said section containing a bromine outlet port.
References Cited (Backward Citations)
US1902801A
Cited
US2359221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |