Method for reducing the sugar loss in the removal of a coagulate from pre-liming juice and for thickening the coagulate, use of a decanter centrifuge, fraction containing protein, and sugar beet pre-liming juice

A method for producing a clear sugar beet pre-liming juice and a protein-containing fraction from sugar beet raw juice, comprising the following method steps:

• a) providing the sugar beet raw juice;
• b) pre-liming the sugar beet raw juice provided in method step a) to obtain a pre-liming juice, forming a coagulate of non-sucrose solids forming in the obtained pre-liming juice;
• c) setting a solids content of 15-25% by volume (based on the total volume of the pre-liming juice provided in method step b), in the pre-liming juice;
• d) separating the coagulate from the pre-liming juice obtained in method step c) using at least one decanter centrifuge, comprising a motor-driven, rotating centrifugal bowl including a cylindrical portion and a conical portion, wherein the angle between the longitudinal axis of the centrifugal bowl and the generatrix of the conical portion is 6° to 10°, and an extruder screw mounted rotatably in the centrifugal bowl;
• and
• e) obtaining the clear sugar beet pre-liming juice and the removed coagulate in the form of a protein-containing fraction.