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De Smet, world leader in extraction technology for fats and oil products
We build extraction plants !
The purpose of solvent extraction is to remove most of the oil contained in a seed. Extraction is conducted on prepared seeds or, generally in the case of high oil content seeds, the cakes yielded by the pre-presses. Solvent extraction consists of a sequence of four operations, i.e. :
- Physical removal of oil from the seed in the LM Extractor or in the Reflex Extractor.
- Desolventising-toasting of the de-oiled seed - i.e. meal - often combined with drying and cooling of the said meal.
- Distillation, to remove the solvent from the extracted oil.
- Recovery of solvent, which is reused again and again at extractor level.
De Smet has supplied over 780 extractors
The REFLEX Extractor
Material mixed with miscella is slurry-fed into the rotating baskets - Extraction starts immediately.
After the initial slurry feed, the bed of material is continuously washed with countercurrent stages of miscella. Totally sealed basket dividers ensure each miscella stage flows through the proper basket of material.
Totally sealed basket dividers allow the entire bed of material in the extraction zone to be thoroughly soaked in miscella. This minimizes inactive time between miscella stages and maximizes contact time. Since the miscella has more contact time to penetrate the flake than in shallow bed designs, thicker flakes can be used to achieve desired residual oil.
Savings on Seed Preparation
De Smet supplied over 700 Desolventising Toasters, Dryer Coolers, and DTDC.
The desolventiser-toaster serves the purpose of removing the solvent from the meal, which can be directly used as an ingredient in animal feed compounds.
A desolventiser-toaster consists of a vertical stack of several cylindrical gas-tight pans, each having a steam-heated bottom. In the top trays, solvent is evaporated by simple heating in dry atmosphere. Live steam injection is used in the lower compartments and removes most of the residual solvent from the meal.
The meal is generally dried and cooled in additional pans located below those used for desolventising.
Desolventiser Toaster Dryer Cooler
De Smet Hytech Distillation
For the plant design and optimization, De Smet is using process simulation and special CAD tools. A unique computerised model is able to simulate all the plant and provides accurate component characterization, thermodynamic and physical properties prediction and liquid-liquid-vapor phase equilibria rigorous calculations.
The equipment performance prediction takes into account different internals and arrangements and calculates pressure drop, heat and mass transfer, efficiency, etc.
De Smet supplied over 600 complete distillations.