GB297728A - Improvements in processes and apparatus for the rendering and/or digesting of subjects containing fats and in the separating of the products for useful purposes - Google Patents

Abstract

297,728. Gearin & Sons, Ltd., M., and Cullen, J. R. Sept. 26, 1927, [Convention date]. Fats, extracting.-Fat-containing materials such as slaughterhouse offal, meat residues &c., are treated in an externally heated digester with a current of steam under such conditions of dryness, temperature, and pressure of the steam as to dry, and remove vaporized constituents from the material, the rendered fat being drained from the material and then discharged. As shown in Fig. 1, the process may be carried out in a steamjacketed digester 5 having a jacketed base 16, a perforated false bottom 18 on which are mounted perforated draining tubes or cones 21, and a cover 8. Charging is effected at 9 and the treated material is discharged at 13. Steam at a pressure of 5-20 lbs. per sq. inch in the case of edible material, or up to 40 1b. per sq. inch for other materials, is passed through the charge by means of a valve 24 and escapes through a valve 26 to a condenser, whilst steam at a pressure of 30-50 lbs. per sq. inch in the one case, or up to 80 lbs. per sq. inch in the other, and at a correspondingly higher temperature, is fed to the jacket through a valve 28. Fat collects in the space 19 and is removed by closing the valve 24, opening a steam supply valve 25 in the cover and a valve 23 in a discharge pipe 22. When the digestion is completed suction is applied to the treated material to remove moisture before discharge is effected.