Soya
flakes from the preparation section are fed into an Extractor with stainless belt.
Level in hopper is controlled through an ultrasonic level controller which regulates
the speed of the extractor. Miscella
is filtered through special wedgewire filters.
Distillation
comprises of a series of heat exchanges for heat recovery and evaporation of hexane.
The oil is finally stripped in a special stripper operating under low vacuum.
Series of specially designed condensers with tubes of stainless steel are used
for condensing the hexane vapors for recirculation.
The
vent gases are scrubbed with mineral oil before discharge into the atmosphere.
The hexane content of the gases leaving the system are well below the lower explosion
limits. The solvent wet meal is fed through a vapor tight conveyor into desolventiser
toaster equipped with special level controllers.
Here
the meal is desolventised in a series of stages and subsequently toasted to remove
the anti nutritional factors.
The
meal is subsequently dried and cooled for bagging.