ISSN:
1573-9171
Keywords:
cellulose
;
nitration
;
nitric acid
;
kinetics
;
diffusion coefficient
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The regularities of vapor-phase nitration of cellulose with HNO3 under conditions of natural convection and hindered heat removal in the absence of air were studied using the nonisothermal kinetic method. It was established that the nitration rate at the depth of conversion of 0.08 to 0.7 is described by the kinetic law dη/dt =k 1 p/(1+βη), wherek 1 = 104.49±0.6 exp(−A/RT) s−1 atm−1, β = 10−35.5±15.7exp(B/RT),A = 36.6±3.8 kl mol−1, andB = 203±88 kJ mol−1. The diffusion mechanism of vapor-phase nitration of cellulose, which explains the high value of activation energies, is discussed. The effective diffusion coefficient of HNO3 in cellulose at 25 °3.7 · 10−7 cm2 s−1) and the activation energy of diffusion (38.3±4.2 kJ mol−1) were estimated.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01457768
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