Degrees Brix (symbol °Bx) is a measure of the dissolved sugar-to-water mass ratio of a liquid.

Snapshot 1: orange juice concentration from 12 °Bx

Snapshot 2: making tomato paste, 28 °Bx, from tomato juice, 4.5 °Bx

Snapshot 3: 1:4 concentration of a solution

This Demonstration calculates the amount of vapor and concentrate produced by a single-stage evaporator. The adjustable parameters are the feed, expressed in terms of total mass or mass flow rate units, and the concentrations of the feed and concentrate, expressed as mass fractions on a wet weight basis. The mass balance is based on solving the equation

, where

and

are the amount or flow rate of the concentrate and the feed, respectively.

and

are the concentrations of the feed and concentrate, respectively. The amount or flow rate of the vapor,

, is calculated from

.

The

,

, and

values are entered with sliders and the Demonstration calculates and displays the corresponding values of

and

. The Demonstration also plots

versus

and

versus

for the current values of

and

. The current values of

and

corresponding to the chosen

are marked as purple dots on the plots. The maximum limit on the

axis may also be set with a slider.

M. Karel and D. B. Lund,

*Physical Principles of Food Preservation*, 2nd ed., New York: Marcel Dekker, 2003.

R. T. Toledo,

*Fundamentals of Food Process Engineering*, 3rd ed., New York: Springer, 2007.