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Hexenuronic acid in South African Eucalyptus hybrid clones: optimization of the acid hydrolysis (A) stage

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dc.contributor.author Andrew, JE
dc.contributor.author Grzeskowiak, V
dc.contributor.author Kerr, I
dc.date.accessioned 2011-01-20T13:35:18Z
dc.date.available 2011-01-20T13:35:18Z
dc.date.issued 2009-10
dc.identifier.citation Andrew, J, Grzeskowiak, V and Kerr, I. 2009. Hexenuronic acid in South African Eucalyptus hybrid clones: optimization of the acid hydrolysis (A) stage. Tappi Journal, Vol. 8(10), pp 4-12 en
dc.identifier.uri http://www.tappi.org/Bookstore/Technical-Papers/Journal-Articles/TAPPI-JOURNAL/Archives/2009/October/Table-of-Contents/Hexenuronic-Acid-in-South-African-Eucalyptus-Hybrid-Clones-Optimization-of-the-Acid-Hydrolysis-A-.aspx
dc.identifier.uri http://hdl.handle.net/10204/4779
dc.description Copyright: 2009 Tappi en
dc.description.abstract Hexenuronic acid (HexA) is formed during kraft pulping by the conversion of 4-O-methyl-glucuronic acid groups in strong alkali conditions. HexA can be removed from the pulp by including an acid hydrolysis (A) stage in the bleaching sequence. Despite a significant body of work in this area, very little research has been carried out to examine HexA in pulps produced from South African-grown tree species under the conditions of the local pulp and paper industry. The objective of this paper, which is part of a broader study, was to determine the optimum conditions in the A-stage that resulted in maximum removal of HexA, but with minimum impact on the physical and chemical properties of the pulp after bleaching. For this purpose, oxygen delignified pulps produced from a Eucalyptus hybrid clone, E. grandis x E. urophylla, were subjected to acid hydrolysis at varied temperature and reaction times. The pH was kept constant at 3.5 for all experiments. The results showed that the A-stage was efficient in the removal of HexA; acid hydrolysis carried out at 125 degrees Celcius-180min removed as much as 98% of the HexA, resulting in a kappa number reduction of approximately 6 units. en
dc.language.iso en en
dc.publisher Tappi en
dc.relation.ispartofseries Journal Article en
dc.subject Hexenuronic acid en
dc.subject Acid Hydrolysis en
dc.subject Pulp en
dc.subject Paper industry en
dc.subject Eucalypt hybrids en
dc.subject Eucalyptus kraft pulping en
dc.subject Bleaching technologies en
dc.title Hexenuronic acid in South African Eucalyptus hybrid clones: optimization of the acid hydrolysis (A) stage en
dc.type Article en
dc.identifier.apacitation Andrew, J., Grzeskowiak, V., & Kerr, I. (2009). Hexenuronic acid in South African Eucalyptus hybrid clones: optimization of the acid hydrolysis (A) stage. http://hdl.handle.net/10204/4779 en_ZA
dc.identifier.chicagocitation Andrew, JE, V Grzeskowiak, and I Kerr "Hexenuronic acid in South African Eucalyptus hybrid clones: optimization of the acid hydrolysis (A) stage." (2009) http://hdl.handle.net/10204/4779 en_ZA
dc.identifier.vancouvercitation Andrew J, Grzeskowiak V, Kerr I. Hexenuronic acid in South African Eucalyptus hybrid clones: optimization of the acid hydrolysis (A) stage. 2009; http://hdl.handle.net/10204/4779. en_ZA
dc.identifier.ris TY - Article AU - Andrew, JE AU - Grzeskowiak, V AU - Kerr, I AB - Hexenuronic acid (HexA) is formed during kraft pulping by the conversion of 4-O-methyl-glucuronic acid groups in strong alkali conditions. HexA can be removed from the pulp by including an acid hydrolysis (A) stage in the bleaching sequence. Despite a significant body of work in this area, very little research has been carried out to examine HexA in pulps produced from South African-grown tree species under the conditions of the local pulp and paper industry. The objective of this paper, which is part of a broader study, was to determine the optimum conditions in the A-stage that resulted in maximum removal of HexA, but with minimum impact on the physical and chemical properties of the pulp after bleaching. For this purpose, oxygen delignified pulps produced from a Eucalyptus hybrid clone, E. grandis x E. urophylla, were subjected to acid hydrolysis at varied temperature and reaction times. The pH was kept constant at 3.5 for all experiments. The results showed that the A-stage was efficient in the removal of HexA; acid hydrolysis carried out at 125 degrees Celcius-180min removed as much as 98% of the HexA, resulting in a kappa number reduction of approximately 6 units. DA - 2009-10 DB - ResearchSpace DP - CSIR KW - Hexenuronic acid KW - Acid Hydrolysis KW - Pulp KW - Paper industry KW - Eucalypt hybrids KW - Eucalyptus kraft pulping KW - Bleaching technologies LK - https://researchspace.csir.co.za PY - 2009 T1 - Hexenuronic acid in South African Eucalyptus hybrid clones: optimization of the acid hydrolysis (A) stage TI - Hexenuronic acid in South African Eucalyptus hybrid clones: optimization of the acid hydrolysis (A) stage UR - http://hdl.handle.net/10204/4779 ER - en_ZA


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