Barium Sulfate Crystallization in the Presence of variable Chain Length Aminomethylenetetraphosphonates and cations (Na+ or Zn2+)

Barouda, E.; Demadis, K.; Freeman, Sandra; Jones, Franca; Ogden, Mark

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Authors

Barouda, E.

Demadis, K.

Freeman, Sandra

Jones, Franca

Ogden, Mark

Date

2007

Type

Journal Article

Metadata

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Citation

Barouda, Eleni and Demadis, Konstantinos and Freeman, Sandra and Jones, Franca and Ogden, Mark. 2007. Barium Sulfate Crystallization in the Presence of variable Chain Length Aminomethylenetetraphosphonates and cations (Na+ or Zn2+). Crystal Growth and Design 7 (2): 321-327.

Source Title

Crystal Growth and Design

Additional URLs

http://www.elsevier.com/locate/jcrysgro

http://pubs.acs.org/journals/cgdefu/index.html

http://pubs.acs.org/cgi-bin/article.cgi/cgdefu/2007/7/i02/pdf/cg0604172.pdf

Faculty

Department of Applied Chemistry

Division of Engineering, Science and Computing

Faculty of Science

Remarks

Open access to this article available via the website of the American Chemical Society. http://acswebcontent.acs.org/home.html

The website for the journal Crystal Growth and Design is available at:

http://pubs.acs.org/journals/cgdefu/index.html

URI

http://hdl.handle.net/20.500.11937/21187

Collection

Curtin Research Publications

Abstract

Barium sulfate is a common scale in oil production installations that is treated and controlled with phosphonate inhibitors. A fundamental understanding of how these inhibitors operate, however, is only slowly emerging. In this paper, we investigate the effect on barium sulfate crystallization of two very similar phosphonate molecules that only differ in their backbone spacing, ethylenediamine-N,N,N',N'-tetra(methylenephosphonic acid) (EDTMP) and hexamethylenediamine-N,N,N',N'-tetr(methylenephosphonic acid) (HDTMP). It was found that the inhibitory efficacy of the organic molecules depends on their structural differences but also on the presence of other cations such as Zn2+. It appears that both stereochemical considerations and complexation strength differences between the two phosphonate additives result in different inhibitory powers. In the presence of zinc cations and EDTMP, it is found that inhibition is related to the concentration of uncomplexed ("free") organic.