versión On-line ISSN 1678-4499
AZZINI, Anísio; SAVY FILHO, Ângelo; SALGADO, Antonio Luiz de Barros y ARNALDI, Francisca Zuleide. Delignification of agricultural residues of castor bean crop for pulp and paper making. Bragantia [online]. 1984, vol.43, n.2, pp. 519-530. ISSN 1678-4499. http://dx.doi.org/10.1590/S0006-87051984000200022.
Agricultural residues of castor bean (cultivar IAC-80) crop were studied for pulp and paper making. The quantity of this fibrous material was estimated to be about 17, 20 and 26t/ha, respectively, for Campinas, Tatuí and Tietê regions, State of São Paulo, Brazil. The basic density of castor bean stalks and branchs are low (0.228g/cm3). The micrometrical studies indicated that bast and woody fibers were, respectively, long (5.51mm) and short (0.87mm). According to the technological characteristics studied this raw material can be utilized for pulp and paper manufacture. The main negative problem of this residue is the high content of the medular (pith) fraction. The presence of pith during the delignification reduces the pulp yield and increases the chemicals consumption.