process for producing sugar and ethanol from impure sugarcane sucrose solutions containing high levels of non-sucrose

摘要

process for producing sugar and ethanol from impure sugarcane sucrose solutions containing high levels of non-sucrose. The present invention relates to a process for producing substantially pure sucrose crystals and ethanol from impure sucrose solutions containing high levels of reducing sugars and with low energy consumption. The process comprises the steps of partially concentrating an impure solution of sucrose and reducing sugars by the evaporation process, cooling the pre-concentrated broth to room temperature, selectively fermenting the reducing sugars to ethanol, reheating the fermented material, evaporating the material. fermented, produce one strand of hydroalcoholic vapor and another of partially concentrated sucrose syrup, subject the syrup to successive stages of evaporation, condense the hydroalcoholic vapor stream, distill the hydroalcoholic condensate in successive stages to obtain a stream rich in ethanol, concentrate the sucrose rich syrup, induce sucrose crystallization to a mass containing sucrose crystals and subject the resulting molasses to fermentation to ethanol.