In an extraction of natural colour from red cabbage for food industry, red cabbage containing 15 wt% colour and the balance solids are ground and fed to the stirring tank, along with feed ethanol. The ground red cabbage is suspended in the ethanol liquid for certain time to allow maximum extraction of red cabbage colour into the ethanol. The stirring tank effluent passes to a filter. The filter cake contains 75.0 wt% red cabbage solids and the balance red cabbage colour and ethanol, the latter two in the same ratio in which they emerge from the stirring tank. The filter cake is discarded and the liquid filtrate is fed to an evaporator in which the ethanol is vaporized and the colour remains as a liquid product. Subsequently, the ethanol vapour is cooled, condensed, recycled and combined with fresh ethanol in the ethanol mixing tank. State basis of calculation, consider assumption in the process specification/s and assumptions in the mass balance calculation. Design the process flow diagram with complete labelling of the flow rate and composition of each stream. Support the design with degree of freedom analysis, mass balance calculation and table of mass balance validation.
In an extraction of natural colour from red cabbage for food industry, red cabbage containing
15 wt% colour and the balance solids are ground and fed to the stirring tank, along with feed
ethanol. The ground red cabbage is suspended in the ethanol liquid for certain time to allow
maximum extraction of red cabbage colour into the ethanol. The stirring tank effluent passes
to a filter.
The filter cake contains 75.0 wt% red cabbage solids and the balance red cabbage colour
and ethanol, the latter two in the same ratio in which they emerge from the stirring tank. The
filter cake is discarded and the liquid filtrate is fed to an evaporator in which the ethanol is
vaporized and the colour remains as a liquid product. Subsequently, the ethanol vapour is
cooled, condensed, recycled and combined with fresh ethanol in the ethanol mixing tank.
State basis of calculation, consider assumption in the process specification/s and
assumptions in the mass balance calculation. Design the process flow diagram with
complete labelling of the flow rate and composition of each stream. Support the design with
degree of freedom analysis, mass balance calculation and table of mass balance validation.
Step by step
Solved in 2 steps with 5 images
