Objective
Demonstrate alkaline beet sugar extraction. Unlike traditional acid extraction, under alkaline conditions the beet retains its firm structure thus increasing the efficiency of juice extraction by mechanical pressing. Dry weight after pressing is increased from 26 % to 40 % and the energy requirement for pulp drying to 90 % DM is halved. Dried pulp is used as animal fodder. Quantity of dried pulp per tonne of beet processed also increases (17 %). Annual energy savings of 3094 T of fuel oil and 541 tonnes of coke are forecast. An increase in electricity consumption does occur equivalent to 68 TOE/YR. Extraction of beet sugar under alkaline conditions is innovatory. Figures for 560000 T/Y of beet processed.
The installation did not work as expected. The main problem being with the pressing. Further tests were being carried out.
The extraction of beet sugar is currently carried out in acidic conditions and requires a large consumption of energy for drying the pulp. In the process described here, the beet slices are treated prior to extraction with a solution of calcium monosaccharate, extraction of the sugar then being carried out in alkaline conditions. The pulp retains a firm structure which considerably facilitates pressing.
Dry matter contents up to 50 % can be obtained with the new process, compared with a value of only 26 % with the standard process.
Energy savings are mainly made through reduction in the amount of water to evaporate, this being half that of the standard process.
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Coordinator
02100 ST QUENTIN
France
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