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US4447663A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for continuous fluorination of carbon

Assignee: Daikin Industries Ltd
•
Filing: 1982-03-01
•
Granted: 1984-05-08
•
Expires: 2002-03-01
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Abstract

Abstract Continuous fluorination of carbon is carried out by employing an apparatus for contact reaction of solid powder and reactive gas which comprises a horizontal reactor having a trough provided with weirs (e.g. height: 1 to 6 mm., interval: 5 to 30 cm.) and a vibrating means for vibrating the trough, and in which carbon particles supplied continuously are transported on the trough in a form of thin layer by the vibration of the trough while continuing the reaction by contacting efficiently the carbon particles with a fluorine gas. The contact reaction is efficiently conducted without accumulating the reaction heat to produce the fluorinated carbon in high yields, and the process is useful for the mass production. The apparatus is also useful for various contact reaction of a solid powder and a reactive gas.

Inventors

  • 👤 Toru Akiyama
  • 👤 Tsutomu Kamihigoshi
  • 👤 Shoji Takagi
  • 👤 Tadayuki Maeda

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 20:02
CPC Classifications
B; B01; B01J; B01J15/00; B01J19/00; B01J19/28; B01J19/285; C; C01; C01B; C01B32/00; C01B32/10; C01B9/00; C01B9/08

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 157 words
A process for the continuous fluorination of carbon in a horizontal reactor, said reactor having a trough provided with a plurality of weirs, carbon feed and exhaust ports in both end portions of the reactor, fluorine gas feed and exhaust ports in both end portions of the reactor, which comprises the steps of: (a) introducing continuously a carbon onto the trough through a carbon feed port in one end portion of the reactor, (b) introducing a fluorine gas or a mixture of fluorine gas and diluent continuously into the reactor through a fluorine gas feed port in one end portion of the reactor, (c) bringing the carbon into contact with the gas to react them at a temperature of 200° to 600° C., while transporting said carbon on the trough in a stream of the gas with vibration, and (d) removing the fluorinated carbon continuously through a carbon exhaust port in another end portion of the reactor.
Claim 2
Dependent Claim 157 words
A process for the continuous fluorination of carbon in a horizontal reactor, said reactor having a trough provided with a plurality of weirs, carbon feed and exhaust ports in both end portions of the reactor, fluorine gas feed and exhaust ports in both end portions of the reactor, which comprises the steps of: (a) introducing continuously a carbon onto the trough through a carbon feed port in one end portion of the reactor, (b) introducing a fluorine gas or a mixture of fluorine gas and diluent continuously into the reactor through a fluorine gas feed port in one end portion of the reactor, (c) bringing the carbon into contact with the gas to react them at a temperature of 200° to 600° C., while transporting said carbon on the trough in a stream of the gas with vibration, and (d) removing the fluorinated carbon continuously through a carbon exhaust port in another end portion of the reactor.
Claim 3
Dependent Claim 17 words
The process of claim 1, wherein the height of said weirs is from 1 to 6 mm.
Claim 4
Dependent Claim 19 words
The process of claim 1, wherein said trough is provided with weirs at intervals of 5 to 30 cm.
Claim 5
Dependent Claim 23 words
The process of claim 1, wherein said trough is vibrated at an amplitude of vibration in the range of 0.1 to 1 mm.
Claim 6
Dependent Claim 24 words
The process of claim 1, wherein said carbon is in the form of powder having an average particle size of not more than 50μ.

References Cited (Backward Citations)

US2774797A Cited
US3925492A Cited
US3929920A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1987-05-08 1987-11-07 1988-05-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1991-05-08 1991-11-07 1992-05-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1995-05-08 1995-11-07 1996-05-08 $7700.00 Window Closed / Lapsed

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