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dc.contributor.author Sithole, Bruce
dc.contributor.author Watanabe, C
dc.date.accessioned 2014-03-04T08:50:39Z
dc.date.available 2014-03-04T08:50:39Z
dc.date.issued 2013-09
dc.identifier.citation Sithole, B and Watanabe, C. 2013. Using Py-GC/MS to detect and measure silicone defoamers in pulp fibres and mill deposits. Journal of Analytical and Applied Pyrolysis, vol. 103, pp 8-16 en_US
dc.identifier.issn 0165-2370
dc.identifier.uri http://ac.els-cdn.com/S016523701200160X/1-s2.0-S016523701200160X-main.pdf?_tid=7bec14d6-a07c-11e3-a824-00000aab0f6c&acdnat=1393594406_41f1a90d241ff77fea4e7c6328b73669
dc.identifier.uri http://hdl.handle.net/10204/7261
dc.description Copyright: 2013 Elsevier. This is the pre/post print version. The definitive version is published in Journal of Analytical and Applied Pyrolysis, vol. 103, pp 8-16 en_US
dc.description.abstract Defoamers are often used to control or reduce foam problems in a variety of pulp and papermaking processes. It has been recognised that non-judicious use of defoamers can lead to undesirable deposition problems. Amide-based defoamers have been largely supplanted by waterbased or water-extended defoamers that are supposed to be non-depositing. However, mill experience and research has shown otherwise. Hence, there is a need for analytical procedures to determine silicone defoamer components in deposits. In this work, for the first time, Py-GC/MS has been used to analyse for silicone defoamers in pulp and paper matrices. This work demonstrates that the technique is ideal for analysis and characterisation of silicone defoamers on pulp fibres and in mill deposits. The technique is easier and much more rapid than using solvent extraction and solid phase extraction, previously developed for analysis of silicone oil defoamers in deposits. It is applicable to silicone defoamers irrespective of molecular weight and can be used to ascertain the source of a particular defoamer formulation. Application of the technique to a washed kraft pulp, previously treated with silicone defoamers, shows that silicone defoamer oil carryover on pulp fibres can be substantial, depending on the defoamer formulation used. In pitch deposits, the level of silicone oil can be over 25% (w/w). In addition, analysis of deposits from mills using the defoamers shows that silicone defoamers have the potential to cause pitch deposition contrary to claims that the defoamers do not cause such problems. Thus, the method can be used to assess the impact of defoamer carryover on pulp properties and the contribution of silicone defoamers to pitch deposition. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Workflow;10646
dc.subject Silicone defoamers en_US
dc.subject Py-GC/MS en_US
dc.subject Pulp fibres en_US
dc.subject Mill deposits en_US
dc.title Using Py-GC/MS to detect and measure silicone defoamers in pulp fibres and mill deposits en_US
dc.type Article en_US


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