Spectrophotometric Determination of Reducing Aldehyde Groups in Bleached Chemical Pulps

Xin-Sheng Chai; Dongcheng Zhang; Qingxi Hou; Sung-Hoon Yoon

Journal of Industrial and Engineering Chemistry, Vol.13, No.4, 597-601, July, 2007

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Spectrophotometric Determination of Reducing Aldehyde Groups in Bleached Chemical Pulps

Xin-Sheng Chai^{1, 2}, Dongcheng Zhang¹, Qingxi Hou³, and Sung-Hoon Yoon^{4, †}

¹School of Light Industrial and Food Engineering, Guangxi University, Nanning, Guangxi 530004, China
²Institute of Paper Science and Technology, Georgia Institute of Technology, 500 10th Street, N.W., Atlanta, GA, China
³Tianjin University of Science and Technology, Tianjin Key Lab of Pulp and Paper Engineering, Tianjin 300222, China
⁴Department of Chemical Engineering, University of Maine, 5737 Jenness Hall, Orono, ME 04469, USA

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The objective of this study was to investigate the potential application of a simple spectrophotometric method for the determination of the reducing aldehyde groups present in pulps. Although the copper number measurement is the conventional way to determine the reducing aldehyde groups in pulps, it is a very complicated and time-consuming titration procedure. In the characterization of the absorption spectrum for the Cu2+ in solution, a distinct absorption band was observed in all the visible absorption range and its maximum peak was found at 700 nm. A strong linear relationship existed between the absorbance for Cu2+ at 700 nm and the reference copper number, indicating a good agreement between them. This spectroscopic method is a simple, fast, and accurate procedure for the determination of pulp copper numbers compared to the conventional method.

Keywords:copper number;pulp;reducing aldehyde groups;spectroscopy

[References]

Wise LE, Wood Chemistry, American Chemical Society Monograph Series, New York, 137 (1944)
Rydholm SA, Pulp Process, Vol.2, Interscience Publishers, New York, 941 (1965)
TAPPI Standard Methods, T430 om-94, TAPPI Press, Atlanta (1994)
Casey JP, Pulp and Paper Chemistry and Chemical Technology, 3rd Ed., Vol.1, John Wisely & Sons, New York, 709 (1981)
Morgan JL, Henry CH, TAPPI J., 42, 859 (1959)
Chai XS, Yoon SH, J. Ind. Eng. Chem., 13(2), 244 (2007)
Atkins PW, Physical Chemistry, 2nd Ed. W. H. Freeman and Company, San Francisco, 603 (1982)

[1] Wise LE, Wood Chemistry, American Chemical Society Monograph Series, New York, 137 (1944)

[2] Rydholm SA, Pulp Process, Vol.2, Interscience Publishers, New York, 941 (1965)

[3] TAPPI Standard Methods, T430 om-94, TAPPI Press, Atlanta (1994)

[4] Casey JP, Pulp and Paper Chemistry and Chemical Technology, 3rd Ed., Vol.1, John Wisely & Sons, New York, 709 (1981)

[5] Morgan JL, Henry CH, TAPPI J., 42, 859 (1959)

[6] Chai XS, Yoon SH, J. Ind. Eng. Chem., 13(2), 244 (2007)

[7] Atkins PW, Physical Chemistry, 2nd Ed. W. H. Freeman and Company, San Francisco, 603 (1982)