Sunflower is crushed for oil recovery via one of two process methods, hard pressing or prepress solvent extraction. Hard pressing relies upon exerting high pressure on the prepared seed to separate oil from the solids fraction, historically recovering about 25% oil from the seed.
How is sunflower oil processed?
To process sunflower into cooking oil, farmers use a grinding machine called an expeller. Because Mrs. Kamuwikeni does not have an expeller, she uses other people¡¯s expellers and pays a processing fee. She says, ¡°After extracting the oil using the expeller, the oil is not clean enough to be sold directly to the community.¡±
What is a prepressed sunflower cake?
Figure 8.20. Prepress cake. The prepressed sunflower cake entering the solvent extraction process is in granular form, with the granules composed of a mixture of proteins, oil, carbohydrates, fiber, and water, bound together in a semipermeable matrix.
What is a prepress solvent extraction method in a sunflower crushing plant?
In a typical sunflower crushing plant using the prepress solvent extraction method, the initial steps of seed pre-cleaning and seed drying are located in the seed receiving section of the facility, prior to seed storage.
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