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Ethanol Production Mass Flow Calculations

The document presents a problem calculating mass flow rates from sugar cane processing. It details that ethanol is produced at a rate of 100,000 L/day and provides fermentation and efficiency rates. It asks to calculate the mass flow rate of the ethanol solution, syrup entering the fermenter, and cane juice feed based on this information and given densities.

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727 views1 page

Ethanol Production Mass Flow Calculations

The document presents a problem calculating mass flow rates from sugar cane processing. It details that ethanol is produced at a rate of 100,000 L/day and provides fermentation and efficiency rates. It asks to calculate the mass flow rate of the ethanol solution, syrup entering the fermenter, and cane juice feed based on this information and given densities.

Uploaded by

Anonymous elDyjv7
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Problem: [ChE Boards April 2014] From sugar cane, ethanol is commercially produced at a rate of 100000 L/day (99.

5% v/v).
From here, fermentation occurs at a rate of 0.511 kg ethanol per kilogram of fermentable sugar. If the syrup is 53% fermentable sugar
and cane juice is 25% syrup with distillation and fermentation being 99% and 90% efficient, respectively, calculate the following:

1. mass flowrate of the ethanol solution produced

a. 176.32 MT/day c. 322.38 MT/day


b. 1302.54 MT/day d. 78.58 MT/day

2. mass flowrate of the syrup entering the fermenter

a. 176.32 MT/day c. 322.38 MT/day


b. 1302.54 MT/day d. 78.58 MT/day

3. mass flowrate of the cane juice feed

a. 176.32 MT/day c. 322.38 MT/day


b. 1302.54 MT/day d. 78.58 MT/day

Solution:

Density of H2O = 997.042 kg/m3 (Perry’s 8e, Table 2-30, p. 2-96)


Density of ethanol = 784.718 kg/m3 (Perry’s 8e, Table 2-32, p. 2-98)

Density of ethanol soln. = 0.995(784.718) + 0.005(997.042) = 785.780 kg/m3

1.

100000 L ethanol soln. 1 m3 785.780 kg 1 MT


( )( )( 3
)( ) = 78.58 MT/day
1 day 1000 L 1m 1000 kg

2.

78.58 MT ethanol soln. 1 kg fermentable sugar 100 kg theo. prodn. 100 kg syrup
( )( )( )( ) = 322.38 MT/day
1 day 0.511 kg ethanol soln. 90 kg actual prodn. 53 kg fermentable sugar

3.

322.38 MT syrup 100 kg theo. prodn. 100 kg cane juice


( )( )( ) = 1302.54 MT/day
1 day 99 kg actual prodn. 25 kg syrup

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