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Solvent Extraction Plant Process
Solvent extraction is a counter-current extraction process for extracting crude edible oil from oilseeds and oil cake using solvent, with Hexane. Hexane-based processes is popular for maximizing oil yield in excess of 95% with a solvent recovery of over 95% which in compare to 60 to 70% oil yield by mechanical expeller pressing. Thus Solvent extraction process is the most efficient process for extracting crude edible oil from oilseeds. Spectec Techno Projects Pvt. Ltd, can provide a complete Continuous Solvent Extraction Plant for the capacity ranges from 50 TPD TO 2000 TPD.
For the complete Solvent Extraction Plant Process, offers the following equipment’s:
- Seed Preparatory Section
- Extractors
- Desolventizer
- Distillation section
- Solvent Recovery System
Seed Preparatory Section
Preparation is the process of properly preparing seeds for extraction of oil. A particular seed may contain from 20 % – 50 % oil, (depending on the seed and and geographical location). The oil is tightly bound within the cell & mechanical action must be taken to remove the oil or to make the oil accessible to subsequent solvent extraction. The unit operations typically involved are scaling, cleaning, cracking, conditioning (or cooking) & flacking. Depending on process & oilseed in question, process drying and hulling may be employed, and also expander., dryer/coolers.
Extractor
The Extractor is a slow moving articulated band conveyor inside a totally enclosed chamber. The band conveyor is lined with perforated sheet, covered with stainless steel wire mesh for easy percolation of Miscella.
The Band Conveyor moves on the rail provided inside the extractor. A series of sprays are located above the band conveyor for spraying miscella and solvent on top of the moving material bed of the extractor. During the movement of the bed through the extractor it is washed continuously at various points with miscella of decreasing concentration and finally with a fresh solvent in a counter current manner by means of sprays kept in a line over the meal bed. The miscella percolates through the meal bed, passed through bottom and collects in various hoppers kept belowthe bed which ultimately flows to the miscella holding tank. The extracted pallets/meal from the band conveyor falls into the discharge bin conveyed to the desolventising section by vapors seal chain conveyor.
Desolventizer
Unlike the standard designs which incorporate 7 stages De-solventizer Toaster to recover hexane vapors from defatted meal, care is taken to protect the quality of protein by desolventizing the meal in only 2 stages dryer with the help of Direct and Indirect heating.
Distillation
Distillation is complete in 4 stages at temperatures not exceeding 100ºC to yield an oil of good color and quality, free of volatiles and moisture, which can cause increase of FFA in storage.
In the first stage 50% of the removal of hexane is done in a Rising Film Evaporator using hot vapors for DT. This specially designed Rising Film Evaporator is an Energy Saving Device. The next step is a Rising Film unit where 98% hexane removal is done using steam.
The final traces of hexane are removed in a vacuum stripper by open steam stripping and the oil is then dried to desired level in an integral vacuumdrier.
In the distillation section, “Spectec” uses Economizers for making the distillation process very energy efficient
Special Features of Economizers of Solvent Extraction Plant-
- Reduces the steam consumption.
- Increases the capacity of distillation section.
- Increases the capacity of condensing section.
Hexane Recovery
This consists of water cooled condensers, vent condenser and mineral oil absorber system to ensure the lowest hexane loss achieved.
The residual vapors from these condensers are evacuated by vacuum pump to a vent condenser cooled by water at 10ºC in close circuit. The residual air is aspirated through an absorption tower where mineral oil absorbs residual hexane in air before being exhausted to the air.
Benefits of Solvent Extraction Plant:
- Designed as per the latest technology.
- Bulk flow conveyor will be used for better performance.
- Specially designed double miscella filtration to remove the fines, which will improve the Quality of oil.
- Low temperature distillation, which will improve the colour and bleachability. This ensures Highest quality of oil which will give you premium on oil and saving of chemicals during the Refinery process.
- Desolventiser toaster is specially designed for different oil seed and pneumatically operated Instead of manual operated, which will have better control on the process.
- Special multi pass economiser design for better heat transfer
- RO / DM / Soft water for contact coolers
- Double water Desolventiser / Reboiler
- Chilled condensor for vapour cooling
- Vent gases will be back to extractor- zero vent
- Condensate and hot water from desolventiser will be used for first evaporator.
- Crude oil heat transfer befor cooling
- Lower power consumption in our plant.
- Lower hexane losses due to our latest designing.
- Low waste water generation – 8 m³/day.
