Startseite Dynamic-head space GC-MS analysis of volatile odorous compounds generated from unbleached and bleached pulps and effects on strength properties during ageing
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Dynamic-head space GC-MS analysis of volatile odorous compounds generated from unbleached and bleached pulps and effects on strength properties during ageing

  • Izhar Alam , Swati Sood und Chhaya Sharma ORCID logo EMAIL logo
Veröffentlicht/Copyright: 20. April 2021
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Abstract

Mixed hardwood unbleached (UB) and final bleached (FB) pulp along with the pulp of intermediate bleaching stages from an integrated paper mill have been undertaken for this study. Headspace GC-MS analysis of these pulps was made to identify the odorous compounds which are volatile organic compounds (VOCs), generated during ageing for 60 days. The result showed that a number of pre-generated VOCs such as aliphatic hydrocarbons and aldehydes are observed in the pulp sample which might be came from the process and it has been observed that upon ageing at ambient conditions, some acid functionalized VOC were generated in the pulp. The generation of these VOCs were established by ATR-FTIR analysis and the results showed that intensity of peak absorbance near 3340  cm 1 and 1641  cm 1 which represents the –OH stretching of acidic functional group and C=O stretch of aldehyde and acidic functional groups increased after ageing. Generation of acid functionalized volatile compounds were observed more in bleached pulp than in unbleached pulp. Degree of polymerization (DP) is pretty much related to the strength of paper. DP of both unbleached and bleached pulp gets reduced upon ageing while more reduction were observed in bleached pulp. Bleached pulps are more prone to degrade as compared to the unbleached pulp in terms of strength properties such as tensile index, breaking length, burst and double fold were observed. 12.3 % and 21.8 % reduction in tensile index was observed for UB and final bleached FB pulp respectively. Burst index of UB and FB pulp were found reduced to 23.8 % and 41.9 % respectively due to ageing. Reduction in the mechanical and optical properties was also observed in intermediate bleaching stages. There is much evidence for the contribution of VOCs to the degradation of paper. The results are strongly suggested that acid functionalized volatile compounds can have strong effects on degradation of cellulosic paper.

Funding statement: The authors state no funding involved.

Acknowledgments

The authors are thankful to the head of department of paper technology, IIT Roorkee, Saharanpur Campus. The authors are also very thankful to the pulp mill supplied for pulp and the laboratory management are gratefully acknowledged.

  1. Conflict of interest: The authors declare no conflict of interest.

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Received: 2021-01-21
Accepted: 2021-03-24
Published Online: 2021-04-20
Published in Print: 2021-09-27

© 2021 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Frontmatter
  2. Chemical pulping
  3. Mapping variation of handsheet properties within loblolly pine trees
  4. A simplified kinetic model for modern cooking of aspen chips
  5. Bleaching
  6. Bleaching of bagasse-pulp using short TCF and ECF sequence
  7. Mechanical pulping
  8. Energy efficiency in mechanical pulping – definitions and considerations
  9. Paper technology
  10. Development of ash condensation performance of paper materials via saccharides and Nano HAP application
  11. Effects of calcium silicate synthesized in situ on Fiber loading and paper properties
  12. Production of fines from refined kraft pulp by fractionation with micro-perforated screens
  13. Dynamic-head space GC-MS analysis of volatile odorous compounds generated from unbleached and bleached pulps and effects on strength properties during ageing
  14. Composite paper from an agricultural waste of bagasse sugarcane and pineapple leaf fibre: a novel random and multilayer hybrid fibre reinforced composite paper
  15. Paper physics
  16. Phenomenological analysis of constrained in-plane compression of paperboard using micro-computed tomography Imaging
  17. Paper chemistry
  18. Preparation and characterization of tung oil-rosin-based polyester internal sizing agent
  19. Coating
  20. Research on brightening modification of molecular sieves coated fly ash based on alkaline melting hydrothermal method
  21. Application of modified cellulose nanofibrils as coating suspension on recycled paper using size press
  22. Chemical technology/modifications
  23. Novel calcium carbonate filler for cellulose industry
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