Abstract Improved method of separating a high molecular weight substance from a viscous liquid thereof, which comprises flashing said viscous liquid into a flashing zone from above via a partitioned baffle passage in said zone to cause said organic high molecular weight substance to adhere to said passage, from whence the high molecular weight substance is caused to drop to the bottom of the flash-drying tank along the inner wall of the baffle passage by means of gravity and the air pressure of the flash stream, and thereafter withdrawing the high molecular weight substance from the lower part of the flashing zone and, on the other hand, also withdrawing from the flashing zone said liquid medium which has been transformed into the vapor phase, and flash-drying apparatus suitable for practicing the method.
In a flash-drying apparatus for separating from a viscous liquid of an organic high molecular weight substance, said high molecular weight substance and the organic liquid medium, said apparatus having at least one flashing nozzle disposed at the top of a flash-drying tank and adapted to flash towards the bottom of said tank a liquid comprising an organic high molecular weight substance in solution or suspension in an organic liquid medium, a discharge outlet at the bottom of said tank for withdrawing the organic high molecular weight substance from which the organic medium has been removed, and a discharge outlet at the top of said tank for venting the vapor of said medium, the improvement comprising: a. the provision of a baffle tube surrounding said flashing nozzle for causing the organic high molecular weight substance to be strippably adhered to the inner wall of the tube to form an aggregate mass, said inner wall being lined with a fluorine resin; b. the distal end of the prolonged portion of said tube opening facing towards the bottom of said tank, the tube being spaced apart from the inner periphery of the sidewall of the flash-drying tank; and c. the discharge outlet for the vapor of said medium being disposed in the tank wall at the point higher than the position at which the distal end of the prolonged portion of said tube opens.
Claim 2
Dependent Claim
24 words
An apparatus according to claim 2 wherein said discharge outlet for the high molecular weight substance is provided with a pair of forwarding rolls.
Claim 3
Dependent Claim
46 words
An apparatus according to claim 2 wherein said discharge outlet for the high molecular weight substance is connected with either a vent extruder or kneading-type drier for further elimination of the minor amount of organic liquid medium which might possibly be still remaining in said substance.