Abstract: The invention relates to a method and hydrolysis tank for enzymatic hydrolysis of raw materials containing collagen and proteins to produce the three layers: a top layer containing fat, a mid-layer comprising water soluble constituents and denatured collagen, and a non-soluble bottom layer comprising bones and non-soluble proteins. These layers are separated and the second layer is further separated by cooling for a time period sufficient to form two layers: a bottom layer containing partially or wholly set collagen, and a liquid top layer containing the remaining water soluble proteins which are removed. The other is heated until it becomes liquid. The hydrolysis tank comprises a turnable stirring mechanism, a device for heat exchange and a reversible screw that is arranged in the bottom of the tank. A clearing sump for separation of collagen, includes an inlet for supply of hydrolysate.

Abstract: Method for an enzymatic hydrolysis process of collagen and raw materials containing proteins. The raw materials undergo enzymatic hydrolysis to produce the three layers: a top layer containing fat, a mid layer comprising water soluble constituents, and a non-soluble bottom layer comprising bones and non-soluble proteins. These layers are separated and the second layer is further separated, in that it is cooled a time period sufficient for the forming of two layers: a bottom layer containing partially or wholly set collagen, and a liquid top layer containing the remaining water soluable proteins. The last layer is removed; and the other is heated until it becomes liquid. A hydrolysis tank 10 comprises a turnable stirring mechanism, and a device for heat exchange. A reversable screw is arranged in the bottom of the tank. A clearing sump 15 for separation of collagen, includes an inlet for supply of hydrolyzat. A heat exchanger system 17 comprising a heating jacket surrounds the sump.