Barium Sulfate Crystallization in the Presence of variable Chain Length Aminomethylenetetraphosphonates and cations (Na+ or Zn2+)
MetadataShow full item record
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:
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.
Showing items related by title, author, creator and subject.
Exploring different models of stroke unit care and outcome : the Stroke Rehabilitation Outcome (SRO) studyDennis, Diane (2013)Introduction: Stroke is a significant cardiovascular event requiring sub-acute rehabilitation, best provided in a stroke unit (SU). These units include dedicated neurological SUs usually catering only for patients with ...
Astfalck, Roslyn G (2009)The prevalence of low back pain (LBP) in the adolescent population is high, with rates approaching adult levels. It has previously been shown that those with LBP during adolescence are at greater risk of experiencing LBP ...
Brown, Annette (2002)Maintenance of physical function with advancing age is vital to continued independent living, which is highly valued by older people. Although commonly associated with the ageing process, loss of functional ability may ...