EJPAU 2006. Wójciak A. INFLUENCE OF MAGNESIUM ADDITION ON HYDROGEN PEROXIDE BLEACHING OF THE ACID TREATED PINEWOOD KRAFT PULP

Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

2006
Volume 9
Issue 1/volume9

Topic:

Wood Technology

ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES

Wójciak A. 2006. INFLUENCE OF MAGNESIUM ADDITION ON HYDROGEN PEROXIDE BLEACHING OF THE ACID TREATED PINEWOOD KRAFT PULP, EJPAU 9(1/volume9), #23.
Available Online: http://www.ejpau.media.pl/volume9/issue1/volume9/abs-23.html

INFLUENCE OF MAGNESIUM ADDITION ON HYDROGEN PEROXIDE BLEACHING OF THE ACID TREATED PINEWOOD KRAFT PULP

Adam Wójciak
Institute of Chemical Wood Technology, The August Cieszkowski Agricultural University of Poznan, Poland

ABSTRACT

The effects of preliminary acid treatment and magnesium sulfate addition during hydrogen peroxide kraft pulp bleaching was evaluated. The magnesium retention level is similar after the acid treatment and after chelation. Independently of differences in native magnesium contents in pulp the addition of magnesium sulfate stabilizes hydrogen peroxide and limits its ability for delignification. Magnesium charge should be optimized for each type of pulp. Too low or too high level of magnesium causes the decrease of brightness and limits delignification. While the excess of magnesium does not influence negatively the degree of polymerization of cellulose.

Key words: bleaching, hydrogen peroxide, magnesium sulfate, kraft pulp.

Adam Wójciak
Institute of Chemical Wood Technology,
The August Cieszkowski Agricultural University of Poznan, Poland
Wojska Polskiego 38/42, 60-627 Poznan, Poland
email: adak@au.poznan.pl

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