| 摘要 |
PURPOSE:A food product containing water and lipid is heated together with a solvent under reduced pressure and the solvent is separated from the distillate and refluxed to remove the solvent containing lipid, thus the lipid in the food product is kept low to give a food product storable for a long period of time without taste deterioration. CONSTITUTION:A food product to be treated such as fish is placed in a cage of stainless steel 2 and put into the dehydration and defatting tank 1, then tightly sealed. As the tank 1, lipid concentration tank 4, condenser 6 and fractionation column 9 are evacuated, a solvent such as ethyl acetate is fed from the tank 11 into the defatting tank 1. When the solvent overflows from the tank 1 through the valve 32 and reaches a certain amount in the tank 4, the valve 31 is closed and the tanks 1 and 4 are heated to effect extraction of lipid in the food product as well as azeotropic distillation at a specific ratio with the water in the food, thus a part of the solvent containing lipid is transferred through the valve 32 to the tank 4. In the meantime, the condensed distillate 6 is separated into water and solvent in the separator 9 and only the solvent is recovered, sent through the valve 36 to the tank 1 for refluxing. When dehydration and defatting are completed to keep the lipid concentration low in the tank 1, the whole solvent in the tank 1 is made to flow down to the tank 4, then the distillation is effected under reduced pressure to remove the solvent. |
