Process and equipment for the extraction of solid material...

C - Chemistry – Metallurgy – 11 – B

Patent

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23/403, 260/497.

C11B 1/12 (2006.01) A23J 1/00 (2006.01) A23K 1/10 (2006.01) B01D 33/00 (2006.01) B01D 35/18 (2006.01) B01D 36/00 (2006.01) B01D 37/00 (2006.01) C02F 11/18 (2006.01)

Patent

CA 1141943

Abstract The present invention provides a method of heat treating a biologically contaminatable material to obtain solids in a granular form and to remove fats therefrom, said method com- prising the steps of: (a) passing said material in a liquid form through a heat exchanger with a residence time of a max- imum of two minutes and at a temperature sufficient to heat said material to 50°C to 125°C; (b) thereafter continuously displacing said material along a storage path while maintaining it at a temperature of 50 to 125°C for a minimum of two minutes thereby melting any fats contained in said material; (c) filtering the material following hot storage in steps (b) by introducing said material in a rotating elongate filter body in a closed housing containing vapor at a temperature of 50 to 125°C, thereby advancing solids from said material from one end of said body to the opposite end thereof and extracting a liquid phase from said material through a wall of said filter body, said solids being advanced through said body for a minimum of four minutes; and (d) drying the solids recovered from said opposite end of said body. The present invention also provides an apparatus for use in the process. The advantage of the process is that the extraction of the solid content of solutions, slurries etc., which are difficult to treat and reduction of the possible fat content of the solid material are achieved by simple means in such a way, that an excellent end-product is available in respect of both the qualitative and other utilization properties.

348217

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