Sugar mfr. by crystallising and centrifuging - with heating of massecuite before centrifuging to improve crystal yield

摘要

Supersatd. massecuite is cooled in downflow crystallisers and then sepd. by centrifuging. Between crystallisation and centrifuging, the massecuite is subjected to a slow, progressive heating. This reduces the compactness of the massecuite and so facilitates different centrifuging without even partial remelting of the crystals during heating. The heating pref. takes place in a vertical, cylindrical vessel in which the massecuite rises countercurrent to a descending flow of a heating fluid, e.g., in a spiral coil. The temp. differential between the massecuite and the heating fluid is pref. 5 degrees C.