Kinetics of autocatalytic acid hydrolysis of cellulose with crystalline and amorphous fractions |
| |
Authors: | Marcelo H Gehlen |
| |
Institution: | 1.Instituto de Química de S?o Carlos,Universidade de S?o Paulo,S?o Carlos,Brazil |
| |
Abstract: | The acid hydrolysis of cellulose with crystalline and amorphous fractions is analyzed on the basis of autocatalytic model
with a positive feedback of acid production from the degraded biopolymer. In the condition of low acid rate production compared
with hydrolysis rate, both fraction of cellulose decrease exponentially with linear and cubic time dependence, and the normalized
number of scissions per cellulose chain follows a sigmoid behavior with reaction time. The model predicts that self generated
acidic compounds from cellulose accelerate the degradation of the biopolymer. However, if the acidic compounds produced are
volatile species, then their release under low pressure will reduce the global rate of degradation of cellulose toward its
intrinsic rate value determined by the residual acid catalyst present in the starting material. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|