| 摘要 |
A process for dehydrating, defatting and deodorizing animal tissue, comprising the steps of comminuting animal tissue, such as whole fishes, diluting or not diluting the resulting tissue suspension with water or a volatile organic solvent, contacting the resulting tissue suspension in countercurrent relation with vapors of the same volatile organic solvent so as to effect an evaporation-extraction process in which a major part of water from the suspension is evaporated and drawn off with the solvent vapors and a major part of fats and odors, if present, is extracted simultaneously by liquid solvent, separating the resulting substantially dehydrated tissue suspension into a fat-containing solvent fraction and a protein-containing solids fraction, and, if desired, subjecting the resulting solids to an additional extraction with fresh liquid solvent. The end product is a protein concentrate suitable for human consumption or animal feed. The vapors drawn off from the evaporation-extraction process are subjected to rectifying distillation and solvent vapors freed from absorbed water are recycled to the evaporation-extraction process. A further part of solvent vapors feed from absorbed water may be used after condensation as a solvent for additional extraction of solids. The fat-containing solvent fractions from main extraction and additional extraction are distilled and this distillation may be combined with the rectifying distillation of water-enriched solvent vapors, said second solvent fraction thereby serving as a reflux liquid for that rectifying distillation.
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