Solvent Extraction of Oil from Seeds

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SOLVENT EXTRACTION OF OIL FROM SEEDS
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SOLVENT OIL EXTRACTION

• Sunflower oil is a vegetable oil, derived from
  the seeds of sunflowers. More than half of these
  seeds consist of fats. In many countries,
  sunflower seeds are eaten raw as a snack or in
  salads, but they can also be pressed into
  sunflower oil.
• Solvent oil extraction is a method of making
  edible oil by using the principle of extraction
  and selecting a kind of organic solvent which can
  dissolve oil and grease, through contacting with
  the oil (soaking or spraying), so that the oil
  and grease in the oil can be extracted.
• Solvent Extraction is the process of diffusing a
  solvent through to the oil source which results
  in the formation of a solution consisting of oil
  in the solvent. In large industries, Pressing may
  precede the process of Solvent Extraction.

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SOLVENT EXTRACTION OF OIL FROM SEEDS

• Oil is an important part of our food and there is
  always a great need for it. With our world so
  heavily dependent on Oil for meeting its food
  needs, Oil extraction and refining is an
  important process in todays industry. Generally
  we source oil from oilseeds like Soybean and
  Rapeseed. They may also be found in vegetables
  and nuts.
• There are many solvents available for this
  process. But the most widely used, and most
  widely accepted, is Hexane. This is because of
  its physical properties and edibility of products
  of Hexane-based Solvent Extraction. The other
  notable solvents which are sometimes used in
  industries are Alcohol-water mixture, Butane,
  Isohexane, Heptane, and a few others.

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APPLICABLE RAW MATERIALS

• At present, the international common practice is
  vegetable oils with high oil content (such as
  peanuts and rapeseed, sunflower seeds,
  cottonseeds, etc.) are usually produced by
  pre-pressing and solvent extraction technology
  vegetable oils with low oil content (such as
  soybeans) are usually produced by direct
  extraction. In order to make full use of oil
  resources and improve economic benefits, oil
  cakes after pressing should generally continue to
  be extracted to produce cooking oil.

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SOLVENT OIL EXTRACTION BASIC PROCESS

• The basic process is to immerse oil flakes (or
  pre-pressed cakes) in selected solvents, dissolve
  oil in solvents (composing mixed oil), then
  separate the mixed oil from solid residues
  (meal), evaporate and strip the mixed oil
  according to different boiling points, so that
  the solvent vaporizes into vapour and oil
  separates, thus obtaining oil (extracted crude
  oil). The solvent vapour is recycled after
  condensation and cooling. The meal also contains
  a certain amount of solvent. After desolution and
  drying, the meal can be dried. The solvent
  vapours volatilized during desolution and drying
  is still recovered by condensation and cooling.

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FACTORS AFFECTING SOLVENT EXTRACTION

• Water Content in Seed Diffusion of solvent into
  the seeds is reduced if there is a high content
  of water in the seeds. Just a right amount of
  moisture is all that is needed.
• Temperature Higher temperatures facilitate
  better extraction.
• Solvent Quantity A high miscella concentration
  means less energy is required for the removing of
  solvent from the oil.
• Shape of Seed The shape of seed should be such
  that it allows flexible movement of solvent in
  the seed.
• Keeping these factors in mind, solvent oil
  extraction process can be best used for
  extracting oil from source materials. The
  de-oiled seed doesnt have much value on its own
  after this process and must be further processes
  before use.

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Thank You
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