Production of dissolving pulp from populus deltoides wood utilizing alkaline pre-extraction followed by soda-AQ pulping process

Document Type : Research Paper

Authors

1 M.Sc. graguate, Pulp and paper industries, Gorgan university of agricultural sciences and natural resources, Golestan, Iran

2 Associate Prof., Pulp and paper industries, Gorgan university of agricultural sciences and natural resources, Golestan, Iran

3 Professor, Pulp and paper industries, Sari university of agricultural sciences and natural resources, Mazandran, Iran

4 Associate Prof., Department of chemistry, University of Tehran, Tehran, Iran

Abstract

Dissolving pulp is used as a raw material to produce numerous cellulosic derivatives like carboxymethyl cellulose, nitrocellulose, viscose, etc. The potential of dissolving pulp production from populus deltoides using alkaline pre-extraction followed by soda-AQ pulping process was investigated across this research. The yield loss of about 15% was achieved in pre-extraction stage through controlling the process parameters, and kappa number of the pulp has been reduced to about 40% with oxygen delignification. The results showed that the alkaline pre-hydrolysis has been affected on increasing the lignin removal rate of fibers. Using alkali catalyst in pre-hydrolysis liquor led to increasing a-cellulose and decreasing brightness level of the dissolving pulp. The a-cellulose and brightness level of dissolving pulp have been upgraded by utilizing higher levels of kappa factor in D0ED1 bleaching. Therefore, the produced dissolving pulp employing 0.45 kappa factor in D0 stage due to its higher a-cellulose, brightness and purity has been more favorable in this research work.

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References

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Iranian Journal of Wood and Paper Industries
Volume 9, Issue 2
September 2018
Pages 289-298

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