Process and apparatus for combined milling and drying

Details Process and apparatus for combined milling and drying Process and apparatus for combined milling and drying

2005-04-19

2005-04-19

Ostrager, Allen (Department: 3725)

Solid material comminution or disintegration

Processes

With heating or cooling of material

C241S021000, C241S022000, C241S024110, C241S057000, C241S060000, C241S062000, C241S065000, C536S124000

Reexamination Certificate

active

06880772

ABSTRACT:
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).

REFERENCES:
patent: 4979681 (1990-12-01), Donges et al.
patent: 5921479 (1999-07-01), Doenges et al.
patent: 6021966 (2000-02-01), Doenges et al.
patent: 6320043 (2001-11-01), Weber et al.
patent: 6685117 (2004-02-01), Poeschl

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