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Task 1 : Solve this problem by hand calculation. Fresh blueberry juice contains an initial concentration of dissolved solids in mass with the balance being
Task :
Solve this problem by hand calculation.
Fresh blueberry juice contains an initial concentration of dissolved solids in
mass with the balance being water. It is to be processed to obtain a
concentrated sample with higher final concentration of dissolved solids for
easier transportation.
For that purpose, an initial process was evaluated where a feed of juice witl
is fed into an evaporator as a single process. However, for this initial
process, some volatile flavouring components were evaporated with the
water leaving the product with a modified taste.
The problem was overcome by bypassing the evaporators with a fraction of
the fresh blueberry feed and mixing with the evaporator product stream to
get a final product of required concentration with improved flavour.
a Draw and label a process flow diagram to represent the improved
process, neglecting the evaporation of volatile components with the
water assume the stream is purely water
b Apply balance boxes and calculate the degree of freedom analysis
for each balance box. For example, demonstrate that the balance
box where the feed stream is split and bypassed from the evaporato
has a degree of freedom of
c Write the order of equations that will be used to determine all
unknown variables.
d Calculate the amount of final product produced per of fresh
juice fed to the process and the fraction of the feed that bypasses th
evaporator.
e As most of the volatile components that affect the flavour of the
concentrated juice are contained in the fresh juice that bypass the
evaporator, another improvement to the process would be increase
the amount of water from the evaporator to increase the juice
concentration to you could then bypass a greater fraction of
fresh juice to get better taste of the product. Discuss possible
drawbacks of this proposal and support your answer.
Task
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