Question

In a food processing of jelly gum candy product, gelatin is used as a raw material. Fructose sugar was used as a sweetener for this candy product. The candy is formed asa cylindrical tube shape with the dimension as per Figure1. ieter, D-20 mm Height, H- 30 mm Figure1: Size and dimension of jelly gum candy. The gelatine candy containing solute fructose (C,HI20) is being immersed in a pure water solvent to study the diffusion rate of fructose. The initial concentration of fructose is 0.2 kgmol/m and the chemical structure is represented in Figure 2. The water velocity is in turbulent region with viscosity of 0.89 mPa.s. at 25°C. Assume the equilibrium distribution coefficient K-1 CH2OH ??-?-? ?-?-?? CH2OH Figure 2: Fructose chemical structure Under steady state condition, determine the diffusivity of fructose in water solution a)

Answer 1

c) Types of resistances which effect diffusion are as follows:

1. External mass transfer resistance .

2. Intra particle mass transfer resistance