Dissertation > Excellent graduate degree dissertation topics show

Process and Mechanism of Eucalyptus Pulp Bleaching Catalysed by Cu2+/Co2+

Author: ShenYunXia
Tutor: ZhouXueFei
School: Kunming University of Science and Technology
Course: Pulp and Paper Engineering
Keywords: eucalyptus kraft pulp copper acetate cobalt acetate ammonium persulfate catalytic pretreatment lignin structure degradation mechanism
CLC: TS745
Type: Master's thesis
Year: 2011
Downloads: 3
Quote: 0
Read: Download Dissertation


In recent years, with the rapid development of national economy, the increasingly demand of some paper whiteness and the more stringent emission requirements of paper industry, it is the inevitable trend that clean production is carried out, chlorine-based agent is reduced, chlorine free agent is used for pollution-free bleaching in pulp industry. Therefore, many countries have researched totally chlorine free (TCF) bleaching. It is key to improve the efficiency of TCF bleaching.In order to develop new no-(little) pollution bleaching technology, in this experiment Cu2+/Co2+ was used as the catalyst in pretreatment raising TCF bleaching efficiency of eucalyptus (Leizhou NO.102) oxygen delignified kraft pulp. The bleaching process and interactions of lignin and catalyst were studied, the principle that catalytic pretreatment enhances the bleaching efficiency was provided.This paper used Cu2+/Co2+, persulfate, acetic acid and O2 as the catalytic pretreatment system and evaluated the catalytic performance which is based on the brightness, viscosity, physical strength and lignin degradation product. The reasonable catalytic conditions are as follows:(1) Cu2+0.01%, molar ratio of ammonium persulfate and Cu2+ 2:1, HAc 20%, atmospheric oxygen, pulp concentration 5%, temperature 70℃. (2) Co2+ 0.01%, molar ratio of ammonium persulfate and Co2+ 2:1, HAc 20%, atmospheric oxygen, pulp concentration 5%, temperature 70℃. (3) Cu2+/Co2+ 0.01%, molar ratio of ammonium persulfate and Cu2+/Co2+ 2:1, HAc20%, atmospheric oxygen, pulp concentration 5%, temperature 70℃,time 2h.The brightness and viscosity of eucalyptus oxygen delignified kraft pulp bleached by O-Cat-Ep-P are as follows:Cu2+ catalytic pretreatment,82.9%ISO,787 mL·g-1; Co2+ catalytic pretreatment,82.2%ISO,791mL·g-1; Cu2+/Co2+catalytic pretreatment,81.9%ISO, 762 mL·g-1. The catalytic pretreatments increased the brightness and viscosity of the resultant bleached pulp compared to the control.Structural changes and degradation products of residual lignin of eucalyptus oxygen delignified kraft pulp were analysed with FTIR, GPC,1H-NMR, elemental analysis, GC-MS during the Cu2+/Co2+ catalytic bleaching to explore the mechanism of lignin degradation.

Related Dissertations

  1. Refining Technology and Its Mechanism for Sack Paper,TS752
  2. Experimental Research on the Degradation of Basic Fuchsin with DBD Plasma-Activated Carbon,X703
  3. Degradation of dielectric barrier discharge combined with studies of gaseous benzene,O621.2
  4. Electrochemical Treatment of pesticide intermediates ( phthalonitrile ) Wastewater,X786
  5. DBD treatment sulfonamide general performance and mechanism of amine,R114
  6. Electrochemistry Degradation of Organic Pollutants with Boron-doped Diamond (BDD) Electrode,X703
  7. Controlled Synthesis of Copper -Manganese Oxide Catalyst Derived from Basic Copper Acetate Precursor,O643.36
  8. Speaking like a brick degradation mechanism and protection,K875
  9. Metaproteomics Analysis and Identification of Lignocellulose Degradation-related Enzymes,Q93
  10. Experimental Research on Dye Wastewater Treatment with Dielectric Barrier Discharge,X703
  11. Habitat Quality Assessment and Its Degradation Mechanism in South Subtropical Islands of China,X826
  12. The Theoretical Study on the Degradation Mechanism of the Organic Pesticide in Atmosphere,X51
  13. Study on the Biodegradability of Alkyl Xanthate Collectors,X703
  14. Study on the Mechanism of Polyamide Membrane Degradation and Grafting Modification with ADMH,X703
  15. Kinetics Study of the Aerobic Oxidation of p-Xylene Catalyzed by Metalloporphyrin and Cobalt Acetate,TQ245.1
  16. Effect of Laccase on Paper Properties and Lignin Structures of High Yield Pulps,TS745
  17. Effect of Alkaline Peroxide Treatment on the Fibre Charge and Lignin Structure of P-RC APMP and CTMP,TS711
  18. Experimental Study on Phenol Wastewater by Electro-Fenton Process,X703
  19. Study on Degradation Mechanism of Sophora Moorcroftiana Shrub in Semiarid Valley Region of Lasa,S714
  20. Preparation of TiO 2 /diatomite Composite and Study on Dye Adsorption & Degradation,X703.5

CLC: > Industrial Technology > Light industry,handicrafts > Paper Industry > Pulping process > Bleach
© 2012 www.DissertationTopic.Net  Mobile