Study of procedure for the obtainment of methylcellulose from mechanic pulp in homogeneous mediaReportar como inadecuado




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Resumen

The etherification reaction of mechanic pulp MP with dimethylsulphate DMS in homogeneous media was studied using a 2 5-1 fractional factional experimental design. In according to this model the quantity of DMS-2 g of dissolved MP and the interaction between reaction temperature and reaction time were established as reaction critical factors. The results obtained under different reaction conditions showed a low mass yield around of 20% and a low porcentage of methoxylation %MeO around of 0,5%. The reasons that could explain this low performance of reaction would be a low NaOH solubility in the mixture solvent dimethylacetamide - lithium chloride DMAc-LiCl which would produce a poor cellulose activation, and the heterogeneous composition of MP which contains besides cellulose, hemicelluloses and ligning, which also could react with DMS.



Autor: Tapia Villanueva, Cristián; - Sapag Hagar, Jaime; - Siches, Pedro; - Valenzuela Lozano, Fernando; - Basualto Flores, Carlos; -

Fuente: http://repositorio.uchile.cl/



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