Details

Autor(en) / Beteiligte

• Hernández-Hernández, Hilda M.
• Chanona-Pérez, Jorge J.
• Vega, Alberto
• Ligero, Pablo
• Farrera-Rebollo, Reynold R.
• Mendoza-Pérez, Jorge A.
• Calderón-Domínguez, Georgina
• Vera, Norma Güemes

Titel

Spectroscopic and Microscopic Study of Peroxyformic Pulping of Agave Waste

Ist Teil von

• Microscopy and microanalysis, 2016-10, Vol.22 (5), p.1084-1097

Ort / Verlag

New York, USA: Cambridge University Press

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The peroxyformic process is based on the action of a carboxylic acid (mainly formic acid) and the corresponding peroxyacid. The influences of processing time (60–180 min), formic acid concentration (80–95%), temperature (60–80°C), and hydrogen peroxide concentration (2–4%) on peroxyformic pulping of agave leaves were studied by surface response methodology using a face-centered factorial design. Empirical models were obtained for the prediction of yield, κ number (KN) and pulp viscosity as functions of the aforementioned variables. Mathematical optimization enabled us to select a set of operational variables that produced the best fractionation of the material with the following results: pulp yield (26.9%), KN (3.6), and pulp viscosity (777 mL/g). Furthermore, this work allowed the description and evaluation of changes to the agave fibers during the fractionation process using different microscopic and spectroscopic techniques, and provided a comprehensive and qualitative view of the phenomena occurring in the delignification of agave fibers. The use of confocal and scanning electron microscopy provided a detailed understanding of the microstructural changes to the lignin and cellulose in the fibers throughout the process, whereas Raman spectroscopy and X-ray diffraction analysis indicated that cellulose in the pulp after treatment was mainly of type I.