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Preparation of prehydrolysis-TMPs with different severity factors and analysis of the pulps and byproducts

  • John A. Lloyd ORCID logo EMAIL logo and Karl D. Murton
Published/Copyright: May 9, 2016

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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Received: 2015-10-11
Accepted: 2016-4-4
Published Online: 2016-5-9
Published in Print: 2016-11-1

©2016 Walter de Gruyter GmbH, Berlin/Boston

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