INVESTIGATION ON THE BLEACHABILITY OF BIO-KRAFT PULP IN ENVIRONMENTAL FRIENDLY ECF METHOD

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RASOOLY GARMAROODY E.; MOHAMMADI I.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: Journal of Wood and Forest Science and Technology Year:2017 | Volume:23 | Issue:4 Page(s): 199-214

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Title

INVESTIGATION ON THE BLEACHABILITY OF BIO-KRAFT PULP IN ENVIRONMENTAL FRIENDLY ECF METHOD

Author(s)

RASOOLY GARMAROODY E. | MOHAMMADI I. | Issue Writer Certificate

Keywords

FUNGAL PRE-TREATMENTQ1

ECF BLEACHINGQ1

DED SEQUENCEQ1

BIO-KRAFTQ1

BLEACHABILITYQ1

Abstract

Background and objectives: Literatures review show that FUNGAL PRE-TREATMENT of chips before original cooking caused to improve in pulp BLEACHABILITY, reduction in bleaching chemical consumption in the chlorination phase to 9%, increasing in brightness of BIO-KRAFT pulp with similar bleaching sequence to 8%. In addition, chemical consumption during ECF BLEACHING of Kraft pulp has a high correlation with kappa number measurements. Furthermore, by evaluation of bleaching spent liquor by the spectroscopic method could be assessed content and type of chlorine used in different sequences of bleaching. Hence, in this research, BIO-KRAFT pulps made from poplar chips pre-treated by Trametes versicolor in 1, 2 and 3 weeks, were bleached in ECF method (DED sequence) for evaluation of their BLEACHABILITY.Materials and methods: Accordingly, in this study, pulps were characterized in lignin content, bleaching yield, Hexenoronic acids (Hex-A), viscosity and efficiency of FUNGAL PRE-TREATMENT on chemical consumption before and after each stage of above-mentioned sequence. Then laboratory handsheets were made from above bleached pulps and tested in optical properties.Results: Results showed that there are approximately reductive trends for kappa number from the first phase to third phase, which is normal based on the target of sequence bleaching. Interestingly, kappa number was enhanced by increasing in pre-treatment time expect third phase of 3-week pre-treatment samples. It's due to non-selectivity of T. versicolor that caused more degradation of carbohydrates due to acidic groups creation specially Hexenoronic acids. These acidic groups were led to wrong measurement of kappa number as more. By progressing in bleaching from phase 1 to phase 3, bleaching yield was increased except 3-weeks pretreatment samples. Also, after bleaching, viscosity of pulps was decreased.Conclusion: In total, FUNGAL PRE-TREATMENT of poplar wood has been effected on its pulp BLEACHABILITY that chemicals consumption was decreased in bleaching process and also adsorption values of chemicals of spent liquor that measured by UV-Vis in 257, 280, 289 and 355 respectively for ClO2, soluble lignin, ClO- and ClO2- increased. Paper brightness was increased by decreasing in lignin content during bleaching process.

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APA: Copy

RASOOLY GARMAROODY, E., & MOHAMMADI, I.. (2017). INVESTIGATION ON THE BLEACHABILITY OF BIO-KRAFT PULP IN ENVIRONMENTAL FRIENDLY ECF METHOD. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, 23(4), 199-214. SID. https://sid.ir/paper/156905/en

Vancouver: Copy

RASOOLY GARMAROODY E., MOHAMMADI I.. INVESTIGATION ON THE BLEACHABILITY OF BIO-KRAFT PULP IN ENVIRONMENTAL FRIENDLY ECF METHOD. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY[Internet]. 2017;23(4):199-214. Available from: https://sid.ir/paper/156905/en

IEEE: Copy

E. RASOOLY GARMAROODY, and I. MOHAMMADI, “INVESTIGATION ON THE BLEACHABILITY OF BIO-KRAFT PULP IN ENVIRONMENTAL FRIENDLY ECF METHOD,” JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, vol. 23, no. 4, pp. 199–214, 2017, [Online]. Available: https://sid.ir/paper/156905/en

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