B - Operations – Transporting – 02 – C
Patent
B - Operations, Transporting
02
C
B02C 23/24 (2006.01) B02C 23/34 (2006.01) C08B 11/20 (2006.01) F26B 1/00 (2006.01) F26B 21/00 (2006.01) F26B 21/04 (2006.01) F26B 23/10 (2006.01) F26B 25/00 (2006.01)
Patent
CA 2409422
A process of both milling and drying a solvent-moist material (e.g., water-moist methylhydroxyethylcellulose) is described. The process includes, (a) providing a mill-dryer (100) which includes, in series, a heat exchanger (1), a mill (2) and a particulate separating apparatus (105) connected by conduits (8), (9) and (11, 12), which together define a mill-dryer circuit (103). The mill- dryer (100) also includes a bypass conduit (14), which provides optionally at least partial gaseous bypass of the heat exchanger (1). The process further includes: (b) introducing the solvent-moist material into the mill (2); (c) circulating a vapor stream (e.g., a steam/air stream) throughout the mill- dryer circuit (103); (d) heating the vapor stream by means of passage through the heat-exchanger (1); (e) forwarding milled particulate material from the mill (2) to the particulate separating apparatus (105) by means of conduit (9); (f) separating the particulate material from the vapor stream in the particulate separating apparatus (105); (g) forwarding the vapor stream from the particulate separating apparatus (105) through conduits (11, 12); and (h) controlling the temperature of the vapor stream by optionally forwarding at least some of the vapor stream through the bypass line (14).
Heidemann Rudolf
Morning Martin
Schlesiger Hartwig
Sonnenberg Gerd
Dow Wolff Cellulosics Gmbh
Fetherstonhaugh & Co.
Wolff Walsrode Aktiengesellschaft
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