Crystallization - Vacuum Pans - ContinuousBy Bento, Luis San Miguel
Posted on 2010-08-09 Last edited on 2010-10-25
A typical continuous vacuum pan has 12 chambers (cells) divided in three zones:
- Conditioning area (Cells 1 t0 3)
Massecuite flows from Cell 1 to Cell 12.
Seed Magma or seed massecuite enter the first cell using a variable speed metering pump. The quantity of seed magma represents about 20% or 33% of final massecuite.
Vacuum is maintained constant during boiling. In a direct control system massecuite entering each cell is controlled to a fixed brix or crystal content.
One advantage of continuous pans is the lower hydrostatic head compared with batch pans. Also, the hydrostatic head, in continuous pans, is maintained constant during crystallization.
Thelwall J.C. de C., 2002, Discussion on batch and continuous boiling
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