Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/9570
Title: Formation of Thermodynamically Unstable Calcium Oxalate Dihydrate in Sugar Mill Evaporators
Contributor(s): East, Christopher Paul (author); Doherty, William Orlando Sinclair (author); Fellows, Christopher  (author)orcid ; Yu, Hong (author)
Publication Date: 2010
Handle Link: https://hdl.handle.net/1959.11/9570
Abstract: Calcium oxalate (CaOX) is the most intractable scale component to remove in sugar mill evaporators by either mechanical or chemical means. The operating conditions of sugar mill evaporators should preferentially favour the formation of the thermodynamically stable calcium oxalate monohydrate (COM), yet analysis of scale deposit from different sugar factories have shown that calcium oxalate dihydrate (COD) is usually the predominant phase, and in some cases is the only hydrate formed. The effects of trans-aconitic, succinic and acetic acids, all of which are present in sugarcane juice, and ethylenediamine tetraacetic acid disodium salt (EDTA) on the growth of CaOX crystals have been examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and thermogravimetric analysis (TGA). trans-Aconitic acid, which constitutes two-thirds of the organic acid component in sugarcane juice, in the presence of sugar resulted in the formation of COD and COM in a 3:1 ratio. EDTA was the most effective acid to promote the formation of COD followed by trans-aconitic acid, then acetic acid and lastly succinic acid.
Publication Type: Conference Publication
Conference Details: ASSCT 2010: 32nd Annual Conference of the Australian Society of Sugar Cane Technologists, Bundaberg, Australia, 11th - 14th May, 2010
Source of Publication: Proceedings of the Australian Society of Sugar Cane Technologists, v.32, p. 522-533
Publisher: Australian Society of Sugar Cane Technologists
Place of Publication: Australia
ISSN: 0726-0822
Fields of Research (FoR) 2008: 039903 Industrial Chemistry
Socio-Economic Objective (SEO) 2008: 820304 Sugar
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
Publisher/associated links: http://www.assct.com.au/assct_main.php?page_id=270
Appears in Collections:Conference Publication
School of Science and Technology

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