solvent extraction
Solvent Extraction, as the name suggests is a process to extract the oil from oil bearing materials by means of Solvent, normally- n – hexane. The plant is designed to extract oil directly from oil seed containing less than 20% oil like soyabean after flaking or it extracts oils from prepressed or fully pressed cake of seeds containing more than 20% oil like sunflower, peanuts, cotton seed, palm kernel, canola, copra, castor and variety of other materials. The extraction is carried out in a long horizontal moving bed that works on counter current, moving bed principal with variable bed height and variable speed mechanism permitting excellent penetration and percolation of solvent for absolute extraction. The low speed of extractor conveyor ensures almost no maintenance. Distillation takes place under vacuum and desolventising of meal is done in liberally designed desolventiser Toaster. For solvent recovery adequate capacity condensors and vent air stripping system is provided.

Special preparatory equipments are recommended to suit individual characteristics of raw materials.

Flow Chart for Solvent Extraction Plant

More details on plant including Specification, Flow Chart, Process Write up available on request.

Solvent Extraction Process

The prepared material from Preparatory section is received in the Feed Hopper through Rotary Valve/Plug Conveyor. The material in the hopper and the rotary valve/Plug Conveyor together constitute an effective vapour seal while the latter also serves to regulate the feed. The hopper is further provided with the special switches for high level and low level indications. The latter if energized stops the band conveyor of extractor while the high level indication, transmits an audio visual signal to Preparatory Section for preparatory operator to take corrective measures.


The Goyum Extractor is long horizontal vessel, Rectangular in cross section in M.S. Construction. An articulated band conveyor inside the Extractor receives the material from Feed Hopper and transports it at a pre determined speed from the feed end to discharge end. The band conveyor moves over rails suitably located inside the Extractor and rides on specially constructed sprockets at either end. The speed of the band conveyor is easily adjustable within desired limits. An adjustable damper enables the regulation of height of bed of material on band conveyor.


A series of sprayers located above the band conveyor enable perfect spray of the solvent on the moving bed. Special spray breakers facilitate uniform distribution of solvent over the entire width of moving bed. Each spraying section is followed by a draining section.Fresh solvent is admitted into the Extractor near the discharge end of the moving bed of material and the full miscella is recovered from the initial stage; thus ensuring the perfect counter current flow of material and the solvent.


It is not merely a simple counter current flow. The miscella circulates in a closed circuit in each of the successive section by overflowing from each hopper of the Extractor after increasing gradually its oil content in each hopper. So in each section there is an equilibrium between the oil extracted from the seed in corresponding section and the difference in oil content of solvent overflowing the preceding hopper together with the solvent overflowing the following section.


The cleaning of the band conveyors is accomplished by high pressure jet spray of fresh solvent onto the return of band conveyor at discharge end which ensures perfect cleaning of mesh and eliminates completely the possibilities of choking of mesh and channeling.


Goyum offers complete solvent extraction systems featuring:

  • Long Extraction Time Ensuring Low Residual Oil.
  • Simple, rugged design for low maintenance & reliable operation.
  • Easy to transport and install.