Halogenation treatment

Details Halogenation treatment Halogenation treatment

C - Chemistry, Metallurgy

08

J

18/1182, 148/24

C08J 7/12 (2006.01) B01J 15/00 (2006.01) C23C 8/08 (2006.01)

Patent

CA 1201864

- 14 - Abstract A batch process for the halogenation of solid polymeric or metallic material comprising the following steps: (a) providing a closed system comprising a chamber containing air at about atmospheric pressure and having inlet and outlet means, a heat exchanger, and a circulation pump, all connected in series; (b) introducing the material into the chamber; (c) heating the chamber and the material to a selected temperature in the range of about 100°F to about 200°F by recirculating the air through the heat exchanger; (d) evacuating the system; (e) introducing a halogen into the system in an amount (i) of up to about 10 percent in excess of the theoretical amount of halogen required to halogenate the polymeric material to a desired depth and (ii) sufficient to provide a partial pressure in the system in the range of about 0.1 psia to about 3 psia; (f) introducing an inert gas into the system is an amount sufficient to provide a total pressure in the system of about one atmosphere; (g) maintaining the selected temperature by recirculating the halogen/inert gas mixture through the heat exchanger; (h) recirculating the halogen/inert gas mixture a sufficient number of times to reduce the amount of halogen to less than about 5 percent - 15 - of the amount of halogen initially introduced into the system; (i) evacuating the system; (j) introducing air into the system to provide about atmospheric pressure; and (k) removing the material.

433210

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