Flaked soybeans are to be leached with hexane to remove the soybean oil. Followi
ID: 85877 • Letter: F
Question
Flaked soybeans are to be leached with hexane to remove the soybean oil. Following experimental data is reported: The soybean flakes enter containing 20% oil and are to be leached to 0.5% (on a solvent-free basis). The net forward flow of the solvent is to be 1.0 kg hexane introduced as fresh solvent per kg flakes, and the fresh solvent is free of oil. The solvent draining from the flakes is generally free of solid except in the first stage: the rich extract contains 10% of the insoluble solid in the feed as a suspended solid. Determine the number of stages required to perform the desired leaching.Explanation / Answer
The leaching of flaked soybean with hexane requires five steps:
The first step involves the transfer of hexane fro the bulk solution to the surface of soybean flakes.In the second step hexane diffuses into soybean flakes by a process called intraparticle diffusion.The third step involves the dissolving of the soybean oil (solute) from the flaed soybean into hexane (solvent).The fourth step involves diffusion of soybean oil to the surface of flaked soybean through intraparticle diffusion.The fifth step involves dissolving of the soybean oil into the bulk solution.
There are three typres of extractors used in th industry namely:shallow bed, medium bed and deep bed extractors.
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