Feed Slurry Filter cake Filter medium Filtrate 9.2 Schematic representation of filtration. Figure
Slurry Filter Filtrate 9.3 Schematic of plate-and-frame figure filter press(adapted from Geankoplis,1983)
Filtrate removal and vacuum a Filter medium Filter cake Slurry Discharge Slurry b) Filter medium Filter cake Filtrate removal Discharge and vacuum 9.4 Continuous rotary filter:(a)rotary figure drum filter,(b)rotary belt filter
Expression ◆ Expression may be defined as forced expulsion (due to pressure) of fluids from semifluid materials. The liquid contained within a semisolid food is forced through some form of filtration medium, whether a perforated metal wall or a porous fabric filter, which retains the solid component of the material. Expression is different from filtration due to the nature of the applied pressure. In expression, pressure is applied by moving retaining walls, whereas pressure is applied in filtration by pumping the material into a fixed area
Expression ◆ Expression may be defined as forced expulsion (due to pressure) of fluids from semifluid materials. The liquid contained within a semisolid food is forced through some form of filtration medium, whether a perforated metal wall or a porous fabric filter, which retains the solid component of the material. Expression is different from filtration due to the nature of the applied pressure. In expression, pressure is applied by moving retaining walls, whereas pressure is applied in filtration by pumping the material into a fixed area
Principles of Operation ◆ When placed under considerable pressure, the cells of the seeds are ruptured, and the oil contained within can flow out. By means of some pressure application device, the seeds are pressed against a plate or filter in order to rupture the internal structure. Pressure also may be applied by such devices as a piston, or a disk rotating within a chamber with narrowing width. A screw press, which simultaneously pumps and compresses, is often used to mechanically separate oil from seed cake
Principles of Operation ◆ When placed under considerable pressure, the cells of the seeds are ruptured, and the oil contained within can flow out. By means of some pressure application device, the seeds are pressed against a plate or filter in order to rupture the internal structure. Pressure also may be applied by such devices as a piston, or a disk rotating within a chamber with narrowing width. A screw press, which simultaneously pumps and compresses, is often used to mechanically separate oil from seed cake