Comparative Performance of Tetraphosphonate and Diphosphonate as Reverse Osmosis Scale Inhibitors

Andrianov, A. P.; Danilycheva, Maria N.; Liakaki-Stavropoulou, Stefania; Demadis, Konstantinos D.; Efremov, R. V.

doi:10.1051/matecconf/201825103049

Cited by 1 publication

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“…This gave a FIC of 53 min at 20 ppm. A poor calcite scale inhibition has been seen previously but not under high-pressure oilfield conditions . There are several factors that are responsible for this observation.…”

Section: Resultsmentioning

confidence: 54%

“…A poor calcite scale inhibition has been seen previously but not under high-pressure oilfield conditions. 26 There are several factors that are responsible for this observation. First, the spacing between the end units may be too long for optimal interaction of both diphosphonate moieties with the calcite surface.…”

Section: High-pressure Scale Inhibition Tube-blocking Experimentsmentioning

confidence: 99%

“…Although there are no reports on the systematic influence of the structural architecture of the alkyldiamine–tetrakis(methylenephosphonate) SIs on the inhibition of calcite or barite scaling under oilfield production conditions, some notable but scattered examples exist. These cases include prevention of CaCO 3 scaling in reverse osmosis (RO) applications, inhibition of gypsum, and barite in the presence of Na + or Zn 2+ . Computional studies with α,ω-diphosphonates on barite were also reported. , Another study used bis(diaminomethylenephosphonates) with alkyl and ether linkers between the N atoms …”

Section: Introductionmentioning

confidence: 99%

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Flexible, Linear, and Systematically Expanded Tetraphosphonate Bolaamphiphiles and Their Inhibition Performance against Calcite and Barite Scale Formation

et al. 2023

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Oilfield scaling is one of the most prevalent water-based oilfield production problems. Chemical inhibitors are often used to combat and prevent scale deposition. The phosphonate functional group is commonly used in many scale inhibitors. A series of bolaamphiphilic alkyldiamine tetrakis(methylenephosphonic acid)s have been synthesized from 1,X-diamines, where X in the polymethylene spacer groups has an even number of 2–12 carbon atoms. These inhibitors were coined CX-T (X is the number of C atoms between the N atoms on the inhibitor backbone, and T stands for tetraphosphonates). All tetraphosphonates showed excellent compatibility with calcium ions at 100 ppm or less, i.e., normal scale inhibitor dosage levels. At higher dosages, the calcium concentration and length of the alkylene spacer chain between the nitrogen atoms also determine the compatibility. Crystal structures were determined for the calcium “complexes” with the tetraphosphonates C2-T, C4-T, C6-T, and C8-T. All tetraphosphonates were investigated for calcite and barite scale inhibition under dynamic conditions using oilfield produced waters based on the Heidrun field water composition, offshore Norway. For calcite scaling, tetraphosphonates with ethylene (2 carbons) and hexamethylene (6 carbons) spacer groups gave the best inhibition performance. For barite scaling, the best inhibition was observed for the tetraphosphonates with ethylene and tetramethylene spacer groups, which relates to the ability of both disphosphonate moieties to interact with a single barium ion.

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Section: Resultsmentioning

confidence: 54%

Section: High-pressure Scale Inhibition Tube-blocking Experimentsmentioning

confidence: 99%