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Development of descriptor tools for the characterization of Australian sugar mill evaporator scale

Rackemann, Darryn W., Doherty, William O.S., & East, Chris P. (2010) Development of descriptor tools for the characterization of Australian sugar mill evaporator scale. In Hogarth, Mac & Knight, Peter (Eds.) Proceedings of the 27th International Society of Sugar Cane Technologists Congress, Veracruz, Mexico.

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    Abstract

    Cleaning of sugar mill evaporators is an expensive exercise. Identifying the scale components assists in determining which chemical cleaning agents would result in effective evaporator cleaning. The current methods (based on x-ray diffraction techniques, ion exchange/high performance liquid chromatography and thermogravimetry/differential thermal analysis) used for scale characterisation are difficult, time consuming and expensive, and cannot be performed in a conventional analytical laboratory or by mill staff. The present study has examined the use of simple descriptor tests for the characterisation of Australian sugar mill evaporator scales. Scale samples were obtained from seven Australian sugar mill evaporators by mechanical means. The appearance, texture and colour of the scale were noted before the samples were characterised using x-ray fluorescence and x-ray powder diffraction to determine the compounds present. A number of commercial analytical test kits were used to determine the phosphate and calcium contents of scale samples. Dissolution experiments were carried out on the scale samples with selected cleaning agents to provide relevant information about the effect the cleaning agents have on different evaporator scales. Results have shown that by simply identifying the colour and the appearance of the scale, the elemental composition and knowing from which effect the scale originates, a prediction of the scale composition can be made. These descriptors and dissolution experiments on scale samples can be used to provide factory staff with an on-site rapid process to predict the most effective chemicals for chemical cleaning of the evaporators.

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    ID Code: 34232
    Item Type: Conference Paper
    Keywords: Evaporator, Scale Composition, Chemical Cleaning
    ISBN: 9780949678379
    Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > ANALYTICAL CHEMISTRY (030100) > Analytical Chemistry not elsewhere classified (030199)
    Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > OTHER CHEMICAL SCIENCES (039900) > Industrial Chemistry (039903)
    Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CHEMICAL ENGINEERING (090400) > Chemical Engineering not elsewhere classified (090499)
    Divisions: Past > Schools > Chemistry
    Current > Research Centres > Centre for Tropical Crops and Biocommodities
    Past > QUT Faculties & Divisions > Faculty of Science and Technology
    Copyright Owner: Copyright 2010 Please consult the authors.
    Deposited On: 27 Aug 2010 09:08
    Last Modified: 01 Mar 2012 00:18

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