GB195911A - Improvements in or relating to the utilization of exhausted sugar-beet slices, waste brewery and distillery grains - Google Patents

Abstract

195,911. Rigby, I. Oct. 28, 1921. Film evaporators; multiple-effect apparatus; vapours, utilizing for effecting further evaporation.-Sugar beet or grain is sliced or crushed, treated to obtain a sugar solution or an extract for brewing or distilling, and the exhausted material is converted into a dry product suitable for cattle-food or other purposes, the exhausted material is being rendered semi-fluid by pulping to bring it into suitable condition for distribution as a thin uniform film on the heating surface of a film drier, and then dried in apparatus of the kind described in Specifications 149,055, 180,963, or 181,035, in which the vapour from the film being dried is used for heating another area of film-drying surface. The water-content is reduced from about 70 to 10-15 per cent, or to such amount as will prevent harmful fermentation. The pulping process may be effected or completed in the drier itself, by introducing the material between two rotating drying drums having different peripheral speeds, as described in Specifications 178,636 and 180,963. When a suitable agglutinant material is available, the pulping may be wholly or partly dispensed with. This form of the process is adopted in treating distillery water which comprises solid husks or grains in suspension in a wash containing up to 3 1/2 per cent of dissolved solids. The draff, consisting of the solid husks or grains after separation from the wash, contains 70-80 per cent of moisture. The wash is concentrated and separated from suspended matter, and the semi-solid concentrate is mixed with draff, the draff itself or the mixture being pulped or not as desired, and the mixture is dried in apparatus of the type referred to above. In both forms of the invention, the drying may be completed in a different type of apparatus, the dried material may be used in its caked form as cattle food, or it may be compressed with or without a binding agent. Other food material such as molasses may be added, preferably before the film-drying. Instead of mixing the semi-solid concentrated wash with the wet draff, the draff mav first be dried and a more thoroughly desiccated concentrate then mixed with it to form the cattle food.