Optimization of ECF bleaching and refining of kraft pulping from olive tree pruning
Autor
Requejo Silva, Ana
Rodríguez Pascual, Alejandro
Colodette, Jorge L.
Gomide, José L.
Jiménez, Luis
Editor
NC State UniversityFecha
2012Materia
Kraft pulpingOlea europaea
Agricultural wastes
Refining
ECF bleaching
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The aim of the present work was to find an optimum kraft pulping process for olive tree pruning (OTP) in order to produce a bleachable grade pulp of Kappa number about 17. The kraft pulp produced under optimized conditions showed a viscosity of 31.5 mPa.s and good physical, mechanical, and optical properties, which are acceptable for paper grade production. The strength and optical properties were measured on pulps unrefined and refined in a PFI mill with up to 2000 revolutions before and after bleaching. The OTP pulp was bleached to 90% ISO brightness (kappa < 1); however the process demanded a long sequence of stages, OD(EP)D(EP)D, and a higher than usual total chemical dosage (24.78 kg/odt pulp). Overall, OTP is suggested as an interesting raw material for cellulosic pulp production because its properties are comparable to those of other agricultural residues currently used in the paper industry.