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The process consists of extracting most of the oil from prepared raw material by Counter Current Extraction for a calculated period. Extracted meal from the 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. Vapours from desolventizer toaster are carried to condenser for vapour / 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 the 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 the heat of vapors from desolventizing Unit.
Maximum solvent from oil – the solvent mixture is recovered at distillation stage. Final solvent traces from oil coming out from the distillation zone are recovered in oil stripper working under vacuum.
In this plant, all extraction operations are carried out in closed equipments working under a 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 the solvent. This solvent-f absorbent oil is again used for recuperation/recirculation. 

Extraction an Desolventizing - Flow Diagram




The main objective of the extraction process is to reduce oil contain in oilseed to the minimum possible level. The chain conveyor from the preparatory transfer the prepared material to the rotary airlock feeder, which further drops it to the feeding hopper. Rotary airlock feeder ensures effective vapor sealing & also regulates the feed. Hopper is provided with special flameproof level switches for the indication of high and low levels. So as to generate an audio signal in the situation of high level, for the preparatory operator to take corrective actions.
VMT’s Extractor is an M.S. or S.S. Construction rectangular vessel installed horizontally. Pre-treated material from preparatory moves on the specially designed articulated band conveyor speed is adjusted according to the process demand. Band conveyor ensures the continuous traveling of the feed material from the feed end to the final end with determined speed, pre-calculated bed height of and under the continuous solvent spray. Bed height of the feed material on band conveyor cleaning is accomplished by height pressure jet spray of fresh solvent on to the return of band conveyor at discharge end which ensures perfect cleaning of mesh and eliminates the possibilities of mesh choking & channelling.


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 designed to hold pressurized steam. The DT has four different types of trays; pre-desolventizing trays, counter-current trays, a spare tray, and a steam drying tray





A mixture of oil and solvent obtained in the extractor is known as Miscella and it normally contains 15% to 25% of oil in solvent. The rich miscella from the extractor is collected in tanks from where it is pumped to the distillation column. It is kept under a vacuum using a series of steam ejectors. The miscella passing through tubes of the evaporator is heated by jacketed steam and thus hexane is turned into vapour immediately. The vapours are led to the condensers via separators. The concentrated miscella passes on to the Oil Preheater to raise the temperature to 100ºC and then to the stripping column for final removal of the last traces of solvent from the oil. The vapours from the equipment are condensed in the condenser.


  1. The suction load data of each steam jet ejector is precisely calculated which ensures the lowest possible consumption of steam, thus reduction in recurring expenses along with a reduction in the heat load on the condensation system.
  2. Distillation is carried out in three stages of vacuum. Thereby achieving incremental concentration of miscella at a predetermined rate. Furthermore, each stage is differentiated by the incorporation of a precisely designed U-type siphon pipe, eliminating the use of a centrifugal pump. This ensures continuous flow of miscella, & reduces power consumption.
  3. Economizer is specially designed having a built-in flasher, which provides a compact design, Minimum plant space, and reduction in unwanted piping. This design itself provides high-efficiency flashing which increases the miscella concentration up to 75%.
  4. The final stage striping is carried out in presence of steam under a higher vacuum of 700 mmHg. This allows the lower temperature distillation and they’re by ensuring undamaged crude oil without colour fixation.



Solvent vapours are formed both in the desolventisation section as well as in the distillation section and these are to be condensed. Special floating head type condensers with stainless steel tubes are provided. The floating head type condenser helps quick and easy removal of the tubular bundle for periodical cleaning.

The air that is being ejected out of the system contains traces of Solvent in order to recover the traces, special final vent air stripping system has been provided. It comprises of a main absorber which is packed with a Pall Rings to give a larger surface of contact. It is partly filled with groundnut oil/ mineral oil being suitable absorbing media which absorbs the Solvent vapor’s from the air. The oil and Solvent mixture are distilled to recover the Solvent.

Recuperation Section - flow diagram


Water cooling is commonly defined as a method of using water as a heat conduction to remove heat from an object or machine, or other substance by passing cold water over or through it. In energy generation, water cooling is typically used to cool steam back into water so it can be used again in the generation process.

Water Cooling System – flow diagram

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