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Modeling Ethylene Glycol Pulping of Vine Shoots

Luis Jiménez, Victoria Angulo, María Jesús de la Torre, Antonio Pérez, Sebastián Caparrós


The influence of the operational variables in the pulping of vine shoots by use of ethylene glycol [temperature (155-185 °C), cooking time (30-90 min) and ethylene glycol concentration (50-70% v/v)] on the pulp properties is discussed. In particular, the yield, kappa number, viscosity, and drainability were studied.

Using a face-centered central composite factorial design and the software BMDP and ANFIS Edit Matlab 6.5, we developed polynomial and fuzzy neural models that reproduced the experimental results of the dependent variables with errors less than 5%. Both types of model are therefore effective with a view to predicting the ethylene glycol pulping process.

Based on the proposed equations, the best choice is to use values of the operational variables resulting in near-optimal pulp properties while saving energy and immobilized capital on industrial facilities by using lower temperatures and shorter processing times. One combination leading to near-optimal properties with reduced costs is using a temperature of 170 °C and an ethylene glycol concentration of 70% for 60 min.


Vine shoots;pulping;ethylene glycol;polynomial modelling;neural fuzzy modeling

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