Drying and heating of polyamide granules

Details Drying and heating of polyamide granules Drying and heating of polyamide granules

F - Mech Eng,Light,Heat,Weapons

26

B

34/36

F26B 17/12 (2006.01) B29B 13/06 (2006.01)

Patent

CA 2020925

- 9 - O.z. 0050/40940 Abstract of the Disclosure: Polyamide granules are dried and heated (for solid-phase postcondensation) by feeding a suspension of granules in water into a sieve means (1), where the bulk of the water is removed, and then into a tower dryer (10), where they are deposited in bed form and then freed of the remaining water while moving in plug flow under the force of gravity with a counter- current inert gas stream at from 70 to 200°C. The tower dryer possesses an inlet at the top (11) and outlet at the bottom (34) for the granules and also feed lines (20, 22, 31) for the inert gas. To achieve a uniform degree of drying of the granules, the inert gas is divided on entry into the tower dryer at a point between the drying zone and the heating zone into a stream which flows radially inward into the bed of granules on the one hand and a stream which flows radially inward and outward on the other. In this way the inert gas is distributed particu- larly uniformly and the granules are dryable in a very short drying zone down to a water content of 0.0001 kg of water/kg of polymer. The lower, conically tapered area of the tower dryer - bin 30 - ensures a uniform rate of descent of the granules and hence a uniform solid-phase condensation with a favorable molecular weight distribu- tion. The granules may be heated to temperatures close to the softening point of the polymer. In addition, a further stream of inert gas may be passed through the conical bin. The tower dryer (10) is followed by a fluidized bed cooler (41) in which the granules are cooled with air to <50°C.

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