In the production of a bean oil, beans containing 13.0 wt% oil and 87.0% solids are ground and fed to a stirred tank (the extractor). The ground beans are suspended in the liquid, and essentially all of the oil in the beans is extracted into the hexane. The extractor effluent passes to a filter. The filter cake contains 75.0 wt% bean solids and the balance bean oil and hexane, the latter two in the same ratio in which they emerge from the extractor. The filter cake is discarded and the liquid filtrate is fed to a heated evaporator in which the hexane is vaporized and the oil remains as a liquid. The oil is stored in drums and shipped. The hexane vapor is subsequently cooled and condensed, and the liquid hexane condensate is recycled to the extractor and combined with a fresh stream of hexane. This combined stream is fed to the extractor at a ratio of 3 kg hexane/kg beans. Calculate the yield of bean oil product (kg oil/kg beans fed), the required fresh hexane feed (kg C6H14/kg beans fed), and the recycle to fresh feed ratio (kg hexane recycled/kg fresh feed)
In the production of a bean oil, beans containing 13.0 wt% oil
and 87.0% solids are ground and fed to a stirred tank (the
extractor). The ground beans are suspended in the liquid, and
essentially all of the oil in the beans is extracted into the
hexane. The extractor effluent passes to a filter. The filter cake
contains 75.0 wt% bean solids and the balance bean oil and
hexane, the latter two in the same ratio in which they emerge
from the extractor. The filter cake is discarded and the liquid
filtrate is fed to a heated evaporator in which the hexane is
vaporized and the oil remains as a liquid. The oil is stored in
drums and shipped. The hexane vapor is subsequently cooled
and condensed, and the liquid hexane condensate is recycled to
the extractor and combined with a fresh stream of hexane. This
combined stream is fed to the extractor at a ratio of 3 kg
hexane/kg beans. Calculate the yield of bean oil product (kg
oil/kg beans fed), the required fresh hexane feed (kg C6H14/kg
beans fed), and the recycle to fresh feed ratio (kg hexane
recycled/kg fresh feed)
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