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 wt% solids, and the balance oil and hexane in the same ratio in which they emerge from the extractor. The filter cake is discarded and a liquid filtrate is fed to a heated evaporator in which the hexane is vaporized and the oil remains as a liquid. The oil collected as product and the hexane vapor are recycled as shown in figure below. Calculate the yield of bean oil (kg oil/kg bean fed), the required hexane feed (kg C6I414/kg beans fed), and the recycle to fresh feed ratio (kg hexane recycled/ kg hexane in fresh feed)
In the production of bean oil, the beans containing 13 wt% oil and 87
wt % solid are ground and fed to a stirred tank (the reactor) along with a
recycled stream of liquid hexane. The feed ratio is 3 kg hexane/ kg beans.
(4)
(6)
1
Filter cake Oil
FILTER EVAPORATOR
Reactor
N2
H2
Ar
Separator 1
N2, H2, Ar
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 wt% solids, and the balance oil and
hexane in the same ratio in which they emerge from the extractor. The
filter cake is discarded and a liquid filtrate is fed to a heated evaporator in
which the hexane is vaporized and the oil remains as a liquid. The oil
collected as product and the hexane vapor are recycled as shown in figure
below. Calculate the yield of bean oil (kg oil/kg bean fed), the required
hexane feed (kg C6I414/kg beans fed), and the recycle to fresh feed ratio (kg
hexane recycled/ kg hexane in fresh feed).
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