A New Assay Method for Scale Inhibitor Detection at Low Concentrations

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dc.contributor.advisorTomson, Mason B.
dc.contributor.committeeMemberBedient, Philip B.
dc.contributor.committeeMemberLi, Qilin
dc.creatorLiu, Ya
dc.date.accessioned2014-09-16T20:03:06Z
dc.date.available2014-09-16T20:03:06Z
dc.date.created2014-05
dc.date.issued2014-04-23
dc.date.submittedMay 2014
dc.date.updated2014-09-16T20:03:07Z
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.
dc.format.mimetypeapplication/pdf
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>.
dc.identifier.urihttps://hdl.handle.net/1911/77196
dc.language.isoeng
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.
dc.subjectScale inhibitor
dc.subjectDetect
dc.subjectLow concentration
dc.subjectAssays
dc.titleA New Assay Method for Scale Inhibitor Detection at Low Concentrations
dc.typeThesis
dc.type.materialText
thesis.degree.departmentCivil and Environmental Engineering
thesis.degree.disciplineEngineering
thesis.degree.grantorRice University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science
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