The basic principle of oil extraction， leaching known as "extraction" process to extract oil in the oil with an organic solvent. Oil leaching, can be regarded as solid - liquid extraction, it is the use of solvents on the solubility of different substances have different properties, which will be in the process of separation of solid materials related ingredients. When leaching, oil treated with a solvent, wherein the easily soluble component (mainly oil) is dissolved in a solvent. When the oil extraction in the static situation, the oil in the form of molecules transferred, is a "molecular diffusion." However, most of the leaching process, the pellets between the solvent and the case where the relative movement carried out, so that it in addition to molecular diffusion, there is a flow of the solvent depends on the "convective diffusion" process.
Advantage of the legal system of oil extraction, leaching method residual oil with a meal is low (high oil), low labor intensity, good working conditions, good quality meal advantage.
Thus, compared with press law, the legal system of oil extraction is indeed an advanced oil method, has been widely used.
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