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Browsing by Author "Andrew, JE"

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Beneficiation of sawdust waste in the context of an integrated forest bio-refinery mill: Kraft and pre-hydrolysis Kraft pulping properties

Author: Andrew, JE ; Johakimu, Jonas K ; Lekha, P ; Gibril, ME ; Sithole, Bishop B Date: 2018 As part of a broader objective to extract cellulose from sawdust waste material for the production of nano-crystalline cellulose, conventional industrially available processes such as the Kraft and pre-hydrolysis Kraft (PHK) processes were ... Read more
Bleaching of kraft pulps produced from green liquor pre-hydrolyzed South African Eucalyptus grandis wood chips

Author: Andrew, JE ; Johakimu, Jonas K ; Sithole, Bishop B Date: 2014 The effect of hemicellulose pre-extraction of South African Eucalyptus grandis wood chips using green liquor, on subsequent kraft pulping and bleaching processes was studied. This was done in the context of a biorefinery mill producing both ... Read more
Hexenuronic acid in South African Eucalyptus hybrid clones: optimization of the acid hydrolysis (A) stage

Author: Andrew, JE ; Grzeskowiak, V ; Kerr, I Date: Oct 2009 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. ... Read more
Ozone bleaching of South African Eucalyptus grandis kraft pulps containing high levels of hexenuronic acids

Author: Andrew, JE ; Johakimu, Jonas K ; Ngema, NE Date: Aug 2013 Ozone use in conjunction with chlorine dioxide during pulp bleaching offers several advantages over conventional bleaching sequences that make use of chlorine dioxide only. Despite this, in South Africa, only one mill uses ozone. The current ... Read more
A preliminary investigation of Nigerian Gmelina arborea and Bambusa vulgaris for pulp and paper production

Author: Azeez, MA ; Andrew, JE ; Sithole, Bishop B Date: Oct 2015 Two common Nigerian-grown biomasses, gmelina (Gmelina arborea) and bamboo (Bambusaa vulgaris) have been pulped and their fibre characteristics and paper properties examined. The results of their chemical compositions showed some fair similarities. ... Read more
Using statistical experimental design techniques to determine the most effective variables for the control of the flotation deinking of mixed recycled paper grades

Author: Pauck, WJ ; Venditti, RA ; Pocock, J ; Andrew, JE Date: 2012 Waste paper recycling in South Africa has grown to a respectable recovery rate of 43% in 2008. Pending legislation will further boost the recovery rate of recycled paper. Domestic household waste represents the major remaining source of ... Read more

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Browsing by Author "Andrew, JE"

Browsing by Author "Andrew, JE"

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