(g)  Rotary filter:

• • The clear oil is treated with some bleaching agent like ”Fullers Earth Carbon” in filter aid before rotary ...filter.

• Rotary drum filter is used for removal of seed particles which may be present.

• This finished oil is produced.

• From this process around 1-2% oil content remains in the meal.

(h)  Extractor:

• • The flaked seeds or oil extracted seeds from crushing rolls are fed on a moving bed.

• Oil depleted cake is also added in extractor.

• The solvent extracts oil from the seeds.

• The wet meal (the left seed part) is collected in the middle and is sent for solvent removal.

(i)  Solvent removal:

• • Steam is used to extract solvent carried by the oil seeds.

• The rotating blades ensure better exposure to steam.

• The solvent free meal is sent to dryer and then used as animal feed.

• Solvent is collected from top and is recycled after cooling it in heat exchanger.

(j) Flash film evaporator:

• • The solvent is preheated by steam.

• Oil is concentrated here by evaporating the more volatile component (hexane).

• The hexane is recycled back to extractor after heat recovery.

• The use of flash evaporator reduces the cost of vacuum stripping column.

(k)  Vacuum stripping column:

• • The oil from flash evaporator is fed here.

• The stripping is done by steam i.e. steam carries away the hexane.

• And it is under vacuum for the reason that the boiling point of hexane and oil are close to each other.

• Jet ejector is used here to generate vacuum.

• The hexane is recycled again.

• Oil produced here is either directly used or sent for purification.