Importance

Loading Importance Indicators...

Abstract

The invention relates to a process for producing a thermoplastic moulding compound comprising a thermoplastic copolymer A and a graft copolymer B (4), comprising: continuously drying the dewatered graft copolymer B (4) by supplying a drying gas (3) and the dewatered graft copolymer B (4), by moving the dewatered graft copolymer B (4) through the drying gas (3) and forming a fluidized bed (5), the drying gas (3) having a feed temperature T_G,feed in the range from 50° C. to 160° C., and by removing dried graft copolymer B (4) and an offgas (7), wherein i. a starting temperature T_in of the fluidized bed (5) on feeding (9) of the dewatered graft copolymer B (4) is measured, ii. a finish temperature T_out of the fluidized bed (5) on removal (11) of the dried graft copolymer B (4) and/or of the offgas (7) is measured, iii. a difference ΔT_act between the finish temperature T_out and the starting temperature T_in is formed and the difference ΔT_act is compared with a target value ΔT_target, and iv. the finish temperature T_out is adjusted by—increasing a mass flow rate of drying gas (3) supplied and/or the feed temperature T_G,feed of the drying gas (3) when the difference ΔT_act is smaller than the target value ΔT_target or—reducing a mass flow rate of drying gas (3) supplied and/or the feed temperature T_G,feed of the drying gas (3) when the difference ΔT_act is greater than the target value ΔT_target.

Loading the Abstract Image...

First Claim