Distillation: processes – separatory – Addition of material to distilland to inhibit or prevent...
Patent
1983-07-18
1986-07-08
Bascomb, Wilbur
Distillation: processes, separatory
Addition of material to distilland to inhibit or prevent...
203 72, 203 79, 203 88, 203 92, 159 134, 159 163, 159 18, 159 49, 202176, 202185A, 260428, 426488, 426492, B01D 122, C09F 510
Patent
active
045991430
ABSTRACT:
The deodorization and/or physical refining of high-boiling organic edible oils, fats and esters is carried out according to the principle of continuous counter-current falling film stripping steam distillation in an internally imposed temperature field in at least two different zones having different flow conditions for the liquid film and the vapors, respectively, prevailing therein. In the initial zone 10 directly adjacent the liquid charge and ensuring at least two separation stages the vapors flow through trickle passages having a hydraulic equivalent diameter of 73 to 150 mm. If necessary, this initial zone may be subdivided, wherein in the first sub-zone the trickle passages are provided with hydraulic equivalent diameters of 120 to 150 mm and in the second sub-zone the trickle passages are provided with hydraulic equivalent diameters of 73 to 120 mm. In the final zone 22 ensuring six to eight theoretical separation stages the vapors flow through trickle passages having a hydraulic equivalent diameter of 25 to 33 mm. The resultant pressure drop through all zones is less than 2 mbar, which leads to a particularly low requirement of stripping steam. If required, a flash vessel 46 may be disposed between the high temperature heat exchanger 9 and the falling film column 10, in which flash vessel the crude cocoa butter heated to the working temperature is subjected to a flash treatment at substantially the working pressure in the falling film column 10.
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