GB486163A - Improvements in or relating to the treatment of distillery slop - Google Patents

Abstract

Oils are extracted from the distillery slop obtained by fermentation of grain (e.g. maize, rye, barley) to produce alcohol. The slop is heated under a pressure sufficient to maintain it liquid above 240 DEG F., until it is continuously filtrable through cloth, and the solids are removed. Such heating may be at temperatures corresponding to the boiling points of water at suitable gauge pressures. Removal of solids takes place by filtration through cloth, with or without the use of filter aids, when oil is obtained from the filter cake by extraction with solvents such as acetone, ether, hexane, trichlorethylene, which may be preceded by screening, e.g. through an 8-mesh screen.ALSO:Lactic acid is recovered from the liquid constituents of distillery slop obtained by fermentation of grain (e.g. maize, rye, barley) to produce alcohol. The slop is heated under a pressure sufficient to maintain it liquid above 240 DEG F., until it is continuously filterable through cloth, and the solids are removed. Such heating may be at temperatures corresponding to the boiling points of water at suitable gauge pressures. Removal of solids may take place by settling, or by filtration, which may be preceded by screening, e.g. through an 8-mesh screen. The filtrate is mixed with a reagent, e.g. calcium carbonate, for precipitating an insoluble lactate, which may be filtered off.ALSO:Distillery slop obtained by fermentation of grain (e.g. maize, rye, barley) to produce alcohol is heated under a pressure sufficient to maintain it liquid above 240 DEG F., until it is continuously filtrable through cloth, and the solids are removed. Removal of solids may take place by centrifuging, by settling, or by filtration, e.g. through cloth, maybe without the use of filter aids, which may be preceded by screening, e.g. through an 8-mesh screen, and may be followed by a sewage disposal system such as a trickle filter or by chlorination. Part of the filtrate may be mixed with a reagent, e.g. calcium carbonate, for precipitating an insoluble lactate, which may be filtered off and part of this or the original or both filtrates may be concentrated and re-fermented.ALSO:Distillery slop obtained by fermentation of grain (e.g. maize, rye, barley) to produce alcohol is heated under a pressure sufficient to maintain it liquid above 240 DEG F., until it is continuously filtrable through cloth, and the solids are removed. Such heating may be at temperatures corresponding to the boiling points of water at suitable gauge pressures. Removal of solids may take place by centrifuging, by settling, or by filtration, e.g. through cloth, maybe without the use of filter aids (when oil may be obtained from the filter cake by pressing or by extraction with solvents such as acetone, ether, hexane, trichlorethylene), which steps may be preceded by screening, e.g. through an 8-mesh screen (when the solids may be dried for cattle fodder), and may be followed by a sewage disposal system such as a trickle filter or by chlorination. Part of the filtrate may be mixed with a reagent, e.g. calcium carbonate, for precipitating an insoluble lactate, which may be filtered off and part of this or the original or both filtrates may be concentrated and re-fermented. The filtrate may be concentrated in a multiple effect evaporator to 70-80 per cent solid content, and the residual water removed in a heat drier; the dried product may be used as cattle fodder.