Drying of foodstuffs while retaining aroma and other materials - where drying air flows around closed circuit and when passing a membrane gives up moisture which is extracted by cleaning air flow

Process and appts. for drying prods., partic. foodstuffs to retain the aroma, and other valuable materials. The drying gas, usually air, flows around a closed system and passes one side of a membrane where the moisture is extracted by heat exchange leaving the aroma and other valuable materials in t...

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Bibliographische Detailangaben
1. Verfasser:	SCHLUENDER, ERNST-ULRICH, DR., 7500 KARLSRUHE, DE
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	BLASTING DRYING DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM FOODS OR FOODSTUFFS FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BYSUBCLASSES A23B - A23J HEATING HUMAN NECESSITIES LIGHTING MECHANICAL ENGINEERING PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL SEPARATION THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OFNUTRITIVE QUALITIES, PHYSICAL TREATMENT THEIR TREATMENT, NOT COVERED BY OTHER CLASSES TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	Process and appts. for drying prods., partic. foodstuffs to retain the aroma, and other valuable materials. The drying gas, usually air, flows around a closed system and passes one side of a membrane where the moisture is extracted by heat exchange leaving the aroma and other valuable materials in the drying gas. On the remote side of the membrane a flushing gas removes the sepd. moisture. The membrane comprises a pore-free active layer laminated with a thicker porous carrier. Both layers are mfd. in plastic with diffusion coeffts. harmonising with those of the material to be sepd.. The prod. is located in a dryer (1) through which drying air flows and picks up moisture from the prod.. The air then flows to an opposing stream heat exchanger (2) where it is pre-heated to a given temp.. A subsequent heater (3) heats the air to a final temp. before it flows to a material exchanger (4) where it passes a membrane (5). Selective extn. of moisture occurs, leaving the aroma and other useful materials in the recirculating air stream. USE/ADVANTAGE - The process is used for selective drying of prods., partic. foodstuffs contg. a mixt. of moisture types, and retains higher levels of aroma and other valuable materials.