Comparison of various pulping processes for producing pulp from vine shoots |
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| Institution: | 1. Departamento de Ingeniería Química, Campus de Rabanales C-3, Universidad de Córdoba, Córdoba, Spain;2. Instituto de la Vid y el Vino de Castilla-La Mancha (IVICAM), Tomelloso (Ciudad Real), Spain;3. Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, Sevilla, Spain;1. Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade Técnica de Lisboa, Tapada da Ajuda 1349-017 Lisboa, Portugal;2. Unidade de Materiais Têxteis e Papeleiros, Universidade da Beira Interior, 6200 Covilhã, Portugal;1. Chair of Forest Biomaterials, Faculty of Environment and Natural Resources, Albert-Ludwig-University of Freiburg, Werthmannstr. 6, 79085 Freiburg, Germany;2. Freiburg Materials Research Center (FMF), Albert-Ludwig-University of Freiburg, Stefan-Meier Str. 21, 79104 Freiburg, Germany;1. Universidad de Castilla-La Mancha, E.T.S.I. Agrónomos y Montes, Cátedra de Química Agrícola, Avda. de España s/n, 02071 Albacete, Spain;2. Centro de Investigación Agroforestal de Albaladejito, Junta de Comunidades de Castilla-La Mancha, Ctra. Toledo-Cuenca, Km 174, 16194 Cuenca, Spain;3. Instituto de Recursos Humanos para la Ciencia y la Tecnología (INCRECYT), Fundación Parque Científico y Tecnológico de Castilla-La Mancha, Paseo de la Innovación, 1, 02006 Albacete, Spain;1. Pulp and Paper Research Division, BCSIR Laboratories, Dhaka, Dr. Qudrat-i-Khuda Road, Dhaka 1205, Bangladesh;2. Department of Chemistry, Eden Girls College, Dhaka, Bangladesh |
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| Abstract: | The results of characterization for four different vine shoot varieties, grown using two different methods, revealed no significant differences in composition among vine varieties or between growing methods. The holocellulose content of vine shoots (67.14%) is lower than those of other non-wood raw materials (e.g. wheat straw, sunflower stalks, cotton stalks, etc.), but similar to those of pine and higher to those of olive trimmings. On the other hand, their lignin content (20.27%) is similar to those of eucalyptus and the non-wood raw materials. Also, their contents in cold-water, hot-water and 1% soda solubles, and ethanol–benzene extractables, are higher than for pine and eucalyptus.Soda, kraft, ethanol and ethylene–glycol pulping processes have low yields (29–47%) relative to the pulping processes applied to olive trimmings and wheat straw. Kraft pulp is that exhibiting the best properties, including a higher α-cellulose content (73.74%) than pulp from wheat straw or olive trimmings, but a higher lignin content (17.18%). Also, kraft pulp provides paper with the highest breaking length, burst index and tear index (viz. 1316 m, 1.63 kN/g and 1.59 mN m2/g, respectively); these values, which are intermediate among those for olive trimmings, wheat straw and sunflower seeds, are low and can be substantially improved by appropriate refining of the pulp. |
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