Method for cleaning raw sugar-beet juice, comprises preliming the raw juice, first main-liming the prelimed raw juice, and clarifying the pre-limed raw juice after the main-liming in a separation device

摘要

The method for cleaning raw sugar-beet juice, comprises preliming the raw juice, first main-liming the prelimed raw juice, and clarifying the limed raw juice after the main-liming in a separation device (30). A non-saccharose containing fraction is separated from the limed raw juice. The pre-liming takes place by adding milk of lime with a concentration of 0.1-0.3 g calcium hydroxide/100 ml at 75[deg]C. The main-liming takes place by adding milk of lime with a concentration of 0.4-0.7 g calcium hydroxide/100 ml at 70[deg]C. The holding time of the limed raw juice in the separating device is 40 min. The method for cleaning raw sugar-beet juice, comprises preliming the raw juice, first main-liming the prelimed raw juice, and clarifying the limed raw juice after the main-liming in a separation device (30). A non-saccharose containing fraction is separated from the limed raw juice. The pre-liming takes place by adding milk of lime with a concentration of 0.1-0.3 g calcium hydroxide/100 ml at 75[deg]C. The main-liming takes place by adding milk of lime with a concentration of 0.4-0.7 g calcium hydroxide/100 ml at 70[deg]C. The holding time of the limed raw juice in the separating device is 40 min. The clarification of limed raw juice takes place at 70[deg]C. The pre-liming takes place in a first alkalization container (10) and the main-liming takes place in downstream second alkalization container (20). A flocculation aid is added to a concentration of 1-8 ppm after the main-liming of prelimed raw juice, and before clarifying the pre-limed raw juice. The flocculation aid exhibits a molar mass on the average of 5x10 6-22x10 6 g/mol. The separating device is a static or dynamic decanter and contains decanter-centrifuge. The separating device is used for separating a saccharose-containing fraction and non-saccharose-containing fraction as thin sludge based on concentration. The obtained saccharose-containing fraction is led back into the separation device as clear juice and/or sweetie juice. Carbonation takes place by introducing carbon dioxide into the main-liming juice and filtration takes place to develop sludge, so that clear saccharose syrup is obtained. The carbonation comprises first carbonation and filtration, and second carbonation and filtration. Independent claims are included for: (1) a method for production of saccharose syrup from raw sugar-beet juice; (2) a method for production of a composition of non-saccharose from raw sugar-beet juice; (3) a method for production of carbolime from raw sugar-beet juice and milk of lime; and (4) a device for cleaning raw sugar-beet juice.