The popularity of orange juice, especially as a breakfast drink, makes it an important factor in the economy of orange-growing regions. Marketed juice has either gone through a process in which it was concentrated, or it may be a not-from-concentrate juice. Frozen concentrated juice is reconstituted before consumption. Although concentrated juices are less popular in the United States than at one time, they still have a major segment of the market. The approaches to concentrating orange juice include evaporation, freeze concentration, and reverse osmosis. Here we examine the evaporation process by focusing only on two constituents in the juice: solids and water. Fresh orange juice contains approximately 10.0 wt% solids (sugar, citric acid and other indigenous ingredients) and frozen concentrate contains approximately 42.0 wt% solids. The frozen concentrate is obtained by evaporating water from the fresh juice to produce a mixture that is approximately 57.0 wt% solids. However, so that the flavor of the concentrate will closely approximate that of fresh juice, the concentrate from the evaporator is blended with fresh orange juice (and other minor additives) to produce a final concentrate that is approximately 42.0 wt% solids. Assume a basis of 300.0 kg of fresh juice fed to the process.

Calculate the amount of product (42% concentrate) produced per 100kg fresh juice fed to theprocess and the fraction of the feed that bypasses the evaporator.

Answer :

Answer:

The amount of product (42% concentrate) produced per 100 kg fresh juice fed to the process and the fraction of the feed that bypasses the evaporator is 6.27 kg and 0.0627 (Fraction)

Explanation:

Given:

Fresh orange juice --> 10.0 wt% solids

Frozen orange juice concentrate --> 42.0 wt% solids

The frozen concentrate is obtained by evaporating water from the fresh juice to produce a mixture that is approximately 57.0 wt% solids

The concentrate from the evaporator is blended with fresh orange juice to produce a final concentrate that is approximately 42.0 wt% solids

Assume a basis of 300.0 kg of fresh juice fed to the process.

Calculate the amount of product (42% concentrate) produced per 100kg fresh juice?

Overall Solid balance

0.10 * (100 kg) = 0.42 m5

m5 = 23.80 kg

Overall mass balance

100 kg = m3 + m5

m3 = 76.19 kg

(Solve both equations simultaneously)

Mixing point mass balance

m4 + m2 = m5

Mixing point Solid balance

0.57 m4 + 0.10 m2 = 0.42 m5

0.57 kg (23.80 kg - m2) + 0.10 m2 = 0.42 m5

13.57 kg - 0.57 m2 = 9.99 kg

m2 = 6.27 kg

m4 = 17.53 kg

bypass balance

100 = m1 + m2

m1 = 93.73 kg

Fraction = [tex]\frac{m2}{mf}[/tex] = [tex]\frac{6.27}{100}[/tex] = 0.0627

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