Abstract
A rate equation should be obtained preparatory to designing a reactor. In light of the results of various published tests, the author assumed that the gaseous acetylation of dried rayon staple is governed primarily by the diffusion of acetic anhydride. Accordingly, experiments were made under various vapor tensions of acetic anhydride and the following rate equation was obtained: ∂M/∂θ=Kcc/Mn Where M: Acetylated molal fraction. c: Concentration of acetic anhydride (kg/m3). θ: Time (min.) Values of coefficients are kc=0.00296 n=1.155 These values, however, are valid only in the following ranges: Concentration of acetic anhydride in vapor 0.7<c<1.5 (kg/m3) Temperature 120°C-145°C Concentration of acetic anhydride in vapor condensate emerging from reactor 760-780g/L (The remainder is acetic acid.)
