Advanced Materials Processing and Manufacturing by Yogesh Jaluria

Author:Yogesh Jaluria
Language: eng
Format: epub, pdf
Publisher: Springer International Publishing, Cham

6.7.2 Chemical Reactions

It is also important to model the chemical conversion process in reactive materials, such as food, to determine the nature and characteristics of the extruded material. A simple approach to analyze these processes is discussed here. The governing equation for chemical conversion may be given as (Wang et al. 1989)

(6.18)

where t is time and X is the degree of conversion, defined as

(6.19)

Here, M o is the initial amount of unconverted material, such as starch, corn meal, etc., M f is the final amount of unconverted starch, and M t is the amount of unconverted starch at time t. The order of the reaction is m, and K is the reaction rate.

The order of the reaction m in Eq. (6.18) has been shown to be zero and the rate of the reaction K given as (Wang et al. 1989)

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