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The Solvent extraction plants are used where oil is extracted from oil seeds like soyabean, sunflower, cottonseed, other oil seeds and oil cakes like mustard cake, groundnut cake and rice bran.

The process consists of extracting most of the oil from prepared raw material by Counter Current Extraction for a calculated period of time. The extracted meal from extractor is transferred for recovery of entrapped solvent to desolventizer toaster, where solvent from the meal is removed as well as the desolventized material is conditioned by controlling and adjusting the temperature and moisture. The conditioned desolventized toasted meal is sent for bagging. Vapors from desolventizer toaster are carried to condenser for vapor / solvent condensation & recovery of solvent via Economizer. Solvent after removal of moisture is re-circulated. Miscella after fine separation using Hydro Clones is pumped / feed to distillation section comprising of Evaporator, Heater, and Vapor condensing unit. Miscella is transferred to Evaporator via economizer where miscella is initially heated up and part of solvent is recovered by utilizing heat of vapors from desolventising unit.
Maximum solvent from oil – solvent mixture is recovered at distillation stage. Final solvent traces from oil coming out from distillation zone are recovered in oil stripper working under vacuum.
In this plant, all extraction operations are carried out in closed equipment’s working under vacuum to avoid any solvent loss by evaporation. Air entrapping with the system along with solvent is passed through recuperation system where solvent traces from outgoing vent gases vapors are recovered by absorbing the solvent in absorbing liquid. Hexane from solvent absorbent is recovered by heating the mixture and condensing solvent. This solvent free absorbent oil is again used for recuperation/recirculation.


Major equipments used in the solvent extraction process/Mechanical Accessories


Horizontal Model comprising of articulated band conveyor assembly, which receives the material from the Feed Hopper and transports it at a very slow predetermined speed from the feed to the discharge end. The conveyor moves over the rails which are situated above the miscella hoppers, suitably located inside the Extractor, and rides on specially constructed sprockets at either end, adjustable dampers for regulation of the height of the bed of material on the chain conveyor, series of Spray breakers for a perfect spray of the solvent on the moving bed, with liberal provision for light sight glasses. Band Conveyor Assembly is designed in such a way as to act as a filter bed for eliminating fines, complete with rotary brushes & mesh cleaning system for effective cleaning of mesh and Drum shaft.


The DTs are vertical, cylindrical vessels with a multitude of horizontal trays. The extracted material enters at the top and is supported by the tray. The material is mixed above each tray, and conveyed downward from tray to tray, by agitating sweeps anchored to a central rotating shaft. The heat for increasing meal temperature and evaporating the solvent is supplied by steam, introduced directly and indirectly into the meal via the trays. The trays of the DT are designed with an upper plate, lower plate, and structural members between designed to hold pressurized steam. The DT has four different types of trays; pre-desolventizing trays, counter current trays, a sparge tray, and a steam drying tray.


Vertical cylindrical vessel with conical bottom working on rising film particles provided with tube system. Its function is to utilize heat from DT vapours for concentrating miscella.