Alkaline swelling of hemp woody core chips

Swelling of hemp woody core chips after alkaline (peroxide) impregnation at 70 degrees C, as is practised in alkaline peroxide mechanical pulping (APMP) processes is examined, in relation to pulp yield and chemical composition of the chips. In contrast to wood chips, maximum swelling is attained at...

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Bibliographic Details
Published in:Journal of wood chemistry and technology 1997-01, Vol.17 (1/2), p.187-208
Main Authors: Groot, B. de (Agrotechnological Research Institute, Wageningen, The Netherlands.), Kolk, C. van der, Meer, P. van der, Dam, J.E.G. van, Riet, K. van't
Format: Article
Language:English
Subjects:
Agrotechnological Research Institute
ALKALI TREATMENT
Applied sciences
ASTILLAS
CANAMO
CANNABIS SATIVA
CHANVRE
Exact sciences and technology
GONFLEMENT
HEMP
HINCHAMIENTO
Instituut voor Agrotechnologisch Onderzoek
Paper, paperboard, non wovens
PARTICULE DE BOIS
Polymer industry, paints, wood
Pulp manufacturing
SWELLING
TRAITEMENT AUX ALCALIS
TRATAMIENTO ALCALINO
WOOD CHIPS
Wood. Paper. Non wovens
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Summary:Swelling of hemp woody core chips after alkaline (peroxide) impregnation at 70 degrees C, as is practised in alkaline peroxide mechanical pulping (APMP) processes is examined, in relation to pulp yield and chemical composition of the chips. In contrast to wood chips, maximum swelling is attained at elevated temperature (70 degrees C) without chemical treatment, possibly as the result of relatively high porosity of hemp woody core cell walls. Alkaline swelling at 70 degrees C correlates with the xylan:lignin ratio. Swelling at ambient temperature shows some correlation with acidic group content. Apparent pore size distributions were examined, using 1H NMR spin-spin relaxation. Several apparent pore size distributions could be distinguished within each sample. Elevated temperature, NaOH and peroxide addition are influencing apparent pore size distribution and total pore volume differently. Addition of peroxide results in remarkably enlarged apparent pore sizes, which emphasizes its importance (apart from bleaching) in APMP pulping, enhancing fiber flexibility and fibrillation
ISSN:0277-3813
1532-2319
DOI:10.1080/02773819708003127