Abstract
Thermomechanical pulps (TMPs) were prepared from Pinus radiata D. Don wood chips at pilot scale with application of different preheating severities. The hydrolysis products were separated at the compression screw feeding of the prehydrolysed chips into the refiner. Prehydrolysis of chips with steam at severity factor (SF) 3.5 reduced the refining energy (at 200 CSF freeness) by 36% when compared with the TMP control; however, the pulp quality was unacceptable. In contrast, pulps produced by SF 3.1 at 155°C have physical properties similar to the TMP control, but the energy saving is only 12%. Prehydrolysis darkens wood fibres making pulps unsuitable for printing and writing papers. However, it was demonstrated that the brightness may be recovered via conventional alkaline peroxide brightening. Pulp yield is lower but this disadvantage is offset by the availability of a pressate flow rich in hemicelluloses and hemicelluloses derived sugars in high concentrations that has good potential for conversion to new products. Impregnation of chips with citric acid (CA) during normal TMP processing was also investigated. Although refining energy was lower with CA treatment, the amount of extracted hemicelluloses was too small to be commercially useful. The prehydrolysis-TMP process may be of interest to financially constrained TMP mills provided that: (1) the process configuration is suitable for retrofitting an extended preheating stage with compression screw and (2) the extracted hemicelluloses can be converted to products of higher value than TMP.
Acknowledgments:
The authors gratefully acknowledge the considerable technical input by Garth Weinberg and Gavin Durbin in preparing the pulps, Maxine Smith and Sara Carey for pulp testing and Sean Taylor for pulp bleaching. The authors acknowledge funding provided by the New Zealand Ministry of Business, Innovation and Employment.
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©2016 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Original Articles
- Preparation of prehydrolysis-TMPs with different severity factors and analysis of the pulps and byproducts
- Differences in solubility parameters and susceptibility to salting-out between softwood and hardwood lignosulfonates
- Modified sodium lignosulfonates (NaLS) with straight chain alcohols and their aggregation behavior and adsorption characteristics on solid surfaces
- Improved impregnation efficiency and pulp yield of softwood kraft pulp by high effective alkali charge in the impregnation stage
- Semitransparent, durable superhydrophobic polydimethylsiloxane/SiO2 nanocomposite coatings on varnished wood
- Comparative study of the topochemistry on delignification of Japanese beech (Fagus crenata) in subcritical phenol and subcritical water
- Characterisation of Postia placenta colonisation during 36 weeks in acetylated southern yellow pine sapwood at three acetylation levels including genomic DNA and gene expression quantification of the fungus
- Relation of transverse compression properties and the degree of brown rot biodeterioration of Pinus glabra in the soil block test
- Four-point bending strength of key-hole side-edge-notched western hemlock (Tsuga heterophylla) wood
- Determination of the elasto-plastic material characteristics of Norway spruce and European beech wood by experimental and numerical analyses
- Time dependence of the orthotropic compression Young’s moduli and Poisson’s ratios of Chinese fir wood
Articles in the same Issue
- Frontmatter
- Original Articles
- Preparation of prehydrolysis-TMPs with different severity factors and analysis of the pulps and byproducts
- Differences in solubility parameters and susceptibility to salting-out between softwood and hardwood lignosulfonates
- Modified sodium lignosulfonates (NaLS) with straight chain alcohols and their aggregation behavior and adsorption characteristics on solid surfaces
- Improved impregnation efficiency and pulp yield of softwood kraft pulp by high effective alkali charge in the impregnation stage
- Semitransparent, durable superhydrophobic polydimethylsiloxane/SiO2 nanocomposite coatings on varnished wood
- Comparative study of the topochemistry on delignification of Japanese beech (Fagus crenata) in subcritical phenol and subcritical water
- Characterisation of Postia placenta colonisation during 36 weeks in acetylated southern yellow pine sapwood at three acetylation levels including genomic DNA and gene expression quantification of the fungus
- Relation of transverse compression properties and the degree of brown rot biodeterioration of Pinus glabra in the soil block test
- Four-point bending strength of key-hole side-edge-notched western hemlock (Tsuga heterophylla) wood
- Determination of the elasto-plastic material characteristics of Norway spruce and European beech wood by experimental and numerical analyses
- Time dependence of the orthotropic compression Young’s moduli and Poisson’s ratios of Chinese fir wood