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Cellulose
Published in: Cellulose 8/2018

04-06-2018 | Original Paper

Exploring the influence of initial liquor pH in the pre-hydrolysis stage on alpha-cellulose production from poplar

Authors: Mostafa Nikkhah Dafchahi, Hossein Resalati, Ahmad Reza Saraeyan, Ali Ghasemian, Ali Reza Shakeri

Published in: Cellulose | Issue 8/2018

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Abstract

The effect of using auto pre-hydrolysis liquor, acidic pre-hydrolysis liquor, and alkaline pre-hydrolysis liquor on the production of alpha cellulose from poplar was investigated across this research work. Poplar chips were pulped with soda-AQ pulping process at a kappa number of 15 after being pre-hydrolyzed with different pre-hydrolysis liquors at 170 °C. The residual lignin of chips were more delignified by about 40% using a single stage oxygen delignification and totally bleached with a D0ED1 bleaching sequence. The results indicated that the yield and kappa number of the pulps can be affected by the kind of pre-hydrolysis liquor. In general, using acidic and alkaline catalysts in pre-hydrolysis liquor led to an acceleration in the rate of hemicellulose separation and kappa number reduction. The alkaline pre-hydrolysis and auto pre-hydrolysis had the highest and the least efficiency to remove hemicelluloses from the wood and purify the produced alpha cellulose, respectively. The alkaline pre-hydrolyzed dissolving pulp of poplar due to existing alkali catalyst in the pre-hydrolysis liquor and occurring alkaline darkening had the least brightness, while the acidic pre-hydrolyzed dissolving pulp, because of the effect of acidic catalyst on the reduction of chromophore compounds, had the highest brightness among the pulps. The results illustrated that a dissolving pulp with more purity and alpha-cellulose content is achievable from Poplar through employing an alkaline pre-hydrolysis stage, soda-AQ pulping, and OD0ED1 bleaching sequence.
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Metadata
Title
Exploring the influence of initial liquor pH in the pre-hydrolysis stage on alpha-cellulose production from poplar
Authors
Mostafa Nikkhah Dafchahi
Hossein Resalati
Ahmad Reza Saraeyan
Ali Ghasemian
Ali Reza Shakeri
Publication date
04-06-2018
Publisher
Springer Netherlands
Published in
Cellulose / Issue 8/2018
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-018-1882-4

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