Separation of lignocellulosic components in acetic acid media and evaluation of applications

BERG, A.; FUENTEALBA, C.; SALAZAR, J.:
Journal of Science & Technology for Forest Products and Processes 3:6 (2013) 27-32.

Abstract

This paper presents pilot-level results for a discontinuous process to separate wheat-straw components in an acetic medium. The process consists of an 800-L pressurized digester and a closed pulp washing system based on three consecutive dilution-pressing stages. Com- parative results are presented for softwood, hardwood, and agricultural residues (wheat straw). The main difference between the three materials is the optimum digestion temperature. In the case of agricultural residues, it is possible to operate at normal pressure by adding formic acid to the solution.

The unbleached pulp was used to produce paper in a commercial machine, dissolved carbohydrates were used as a replacement for molasses in dairy cow feed, and lignin was used as a wood adhesive component. The technical results of the process, the characterization of the lignocellulosic components, and applications for the products are reported.

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