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Online since: November 2013
Authors: Jie He, Yong Zhu, Ke Li Chen
Table 2 Results of ClO2 single stage bleaching of two kinds of pulp
ClO2 dosage
[%]
Yield
[%]
Viscosity
[mL·g-1]
Brightness
[% ISO]
PC number
Residual ClO2
[ g·L-1]
Kraft
pulp
1
96.2
948
32.4
1.33
0.081
2
95.8
916
39.5
1.18
0.162
3
95.3
875
48.7
0.99
0.165
4
94.3
837
56.8
0.81
0.166
5
93.5
797
63.1
0.69
0.168
6
93.1
768
63.5
0.68
0.168
Diethanolamine
pulp
1
96.1
967
27.6
1.32
0.085
2
95.8
943
31.3
1.15
0.167
3
95.6
915
37.4
0.98
0.171
4
95.1
896
45.1
0.75
0.173
5
94.6
846
54.7
0.58
0.176
6
93.2
804
55.8
0.57
0.180
Table 2 showed that, even continued to increase ClO2 dosage, two kinds of pulp brightness were hardly more than 70% ISO only by ClO2 single stage bleaching.
Table 4 Results of OD bleaching of two kinds of pulp ClO2 dosage [%] Yield [%] Viscosity [mL·g-1] Brightness [% ISO] PC number Residual ClO2 [ g·L-1] Kraft pulp 1 96.5 913 57.1 1.23 0.086 2 95.7 879 68.4 1.08 0.167 3 95.2 844 71.2 0.87 0.173 4 94.1 825 73.3 0.69 0.178 5 93.8 793 74.6 0.53 0.181 6 92.8 772 75.3 0.42 0.185 Diethanolamine pulp 1 95.7 925 46.4 1.18 0.182 2 95.3 896 52.3 0.98 0.190 3 94.2 882 58.7 0.81 0.193 4 94.2 855 66.4 0.61 0.195 5 93.8 814 70.7 0.48 0.196 6 92.8 773 72.1 0.40 0.196 With Table 4 and Table 2, it could be seen that, compared with ClO2 single stage bleaching, two kinds of pulp brightness were significantly increased after OD bleaching, and they both increased brightness of more than 10%ISO at dosage 6%.
Table 4 Results of OD bleaching of two kinds of pulp ClO2 dosage [%] Yield [%] Viscosity [mL·g-1] Brightness [% ISO] PC number Residual ClO2 [ g·L-1] Kraft pulp 1 96.5 913 57.1 1.23 0.086 2 95.7 879 68.4 1.08 0.167 3 95.2 844 71.2 0.87 0.173 4 94.1 825 73.3 0.69 0.178 5 93.8 793 74.6 0.53 0.181 6 92.8 772 75.3 0.42 0.185 Diethanolamine pulp 1 95.7 925 46.4 1.18 0.182 2 95.3 896 52.3 0.98 0.190 3 94.2 882 58.7 0.81 0.193 4 94.2 855 66.4 0.61 0.195 5 93.8 814 70.7 0.48 0.196 6 92.8 773 72.1 0.40 0.196 With Table 4 and Table 2, it could be seen that, compared with ClO2 single stage bleaching, two kinds of pulp brightness were significantly increased after OD bleaching, and they both increased brightness of more than 10%ISO at dosage 6%.
Online since: December 2014
Authors: Andrey Albertovich Korolev, Albert Viktorovich Korolev, Aleksandr Aleksandrovich Fomin, Sergey Aleksandrovich Savran, Andrey Fyodorovich Balaev, Aleksandr Sergeevich Yakovishin
Acknowledgments
The work is executed at financial support of the Ministry of education and science of Russian Federal program – Agreement No. 14.574.21.0015, government job of the Ministry of education of Russia No. 9.896.2014/K.