| 摘要 |
<FORM:1044043/C4-C5/1> A continuous process for rendering animal fats comprises the steps of cooking animal material in a confined steam atmosphere under pressure to cause the material to separate into meal, fat, and proteinaceous liquid, and obtaining separately the meal, the fat and the proteinaceous liquid. The meal may be dried and in further preferred embodiments a portion of the proteinaceous liquid may be passed into the meal in the steam atmosphere to strip fat from the meal and another portion of the proteinaceous liquid may be passed into the separated meal to obtain protein enriched meal. The invention also comprises apparatus for carrying out the above process. Animal material to be treated is passed through inlet 18 into the lower end of housing 16 which is provided with a helical screw element 24. Steam introduced via inlet ports 34 maintains the animal material at 300-350 DEG F. and 50-120 p.s.i.g. After cooking and rendering, meal is discharged into screw conveyer 36 and rotary drier 40. Combined fat and liquid protein passes to decanter 52 and fat is taken off through line 68. Stickwater, i.e. liquid protein, is recycled via line 73 to the hollow shaft 26 and via spray nozzles 32 to the cooking zone. Stickwater is also passed to surge tank 77 and is then pumped on to meal via spray nozzle 83 to enrich recycle meal with protein and provide 35% by weight moisture on mixing with meal in conveyer trough 38. The final product leaving drier 40 via outlet 49 preferably contains 8% by weight moisture and the moisture content of the fat product is reduced to 0.03% weight. |
