A New Assay Method for Scale Inhibitor Detection at Low Concentrations

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dc.contributor.advisorTomson, Mason B.en_US
dc.contributor.committeeMemberBedient, Philip B.en_US
dc.contributor.committeeMemberLi, Qilinen_US
dc.creatorLiu, Yaen_US
dc.date.accessioned2014-09-16T20:03:06Zen_US
dc.date.available2014-09-16T20:03:06Zen_US
dc.date.created2014-05en_US
dc.date.issued2014-04-23en_US
dc.date.submittedMay 2014en_US
dc.date.updated2014-09-16T20:03:07Zen_US
dc.description.abstractAccurate detection of scale inhibitors has always been crucial to scale control in industry. However, analyzing scale inhibitors at low concentrations, especially with polymeric scale inhibitors, remains an ongoing challenge. This paper presents an assay method designed to detect all types of scale inhibitors, especially at low concentrations, and an expert program developed to guide the method. The program guides the preparation of a field brine barite solution at a fixed barite super-saturation. Scale inhibitor concentration is then measured via the method of standard additions, assuming a linear relationship between the scale inhibitor concentration and the logarithm of barite induction time. Seven different scale inhibitors, including phosphonates, carboxylates and sulfonates, were detected in two typical synthetic brines at low concentrations. In addition, this assay method has also been applied to scale inhibitor detection in actual field brines. In general, this easily-implemented method can directly detect the residual level of any scale inhibitors in field brine about 0.1 mg/L active. Emphasis in this paper is on low concentrations. Measurement of low concentration scale inhibitors not only helps to monitor scaling tendency but also effectively prevents overuse of scale inhibitors and thereby protects the environment and saves money. This is one of the few methods that can detect most scale inhibitors at such low concentrations. Field applications, strengths, and interferences are discussed using laboratory and field examples.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationLiu, Ya. "A New Assay Method for Scale Inhibitor Detection at Low Concentrations." (2014) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/77196">https://hdl.handle.net/1911/77196</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/77196en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectScale inhibitoren_US
dc.subjectDetecten_US
dc.subjectLow concentrationen_US
dc.subjectAssaysen_US
dc.titleA New Assay Method for Scale Inhibitor Detection at Low Concentrationsen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentCivil and Environmental Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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