A Critical Review of Relative Scale Inhibition Performance of Different Alternatives DOI
Konstantin Popov,

Maria Trukhina,

Sergey Tkachenko

et al.

Published: June 21, 2024

A critical review of scale inhibition mechanisms and relative evaluation substoichiometric antiscalant performance are presented. It is shown that such widely accepted efficacy as masking calcium (barium, strontium) ions by formation complexes; ability to impart electrostatic charge the colloids; change crystalline nature sediment; provide "threshold effect" interacting with spontaneously formed nuclei sparingly soluble salt unlikely main contribution phenomenon. At same time, it isolation crystallization templates solid nanoimpurities key importance in retarding nucleation. Numerous examples direct visualization molecules using fluorescently labeled inhibitors illustrate this point. Besides, controversy about inhibitors, provided different screening methods, discussed. In context, necessity elaborating uniform protocol for obligatory test conditions emphasized.

Language: Английский

Evaluation and optimization of antiscalant substances for enhanced reverse osmosis performance DOI Creative Commons
Mahmoud A. Ahmed, Ashraf A. Mohamed

Journal of Saudi Chemical Society, Journal Year: 2024, Volume and Issue: 28(5), P. 101923 - 101923

Published: Aug. 17, 2024

Language: Английский

Citations

8
Application of fluorescent-tagged antiscalants for mitigation of membrane scaling by calcium carbonate and calcium phosphate in electrodialysis stack DOI Creative Commons
Vicente Gil,

M. V. Porozhnyy,

Maxim Oshchepkov

et al.

International Journal of Corrosion and Scale Inhibition, Journal Year: 2024, Volume and Issue: 13(1)

Published: March 30, 2024

Wide application of electrodialysis, which is proven to be highly effective in waste waters treatment and a broad spectrum other technologies, restrained by membrane fouling.The present study dedicated the fluorescent-tagged antiscalants (ASs) for mitigation scaling calcium carbonate phosphate electrodialysis stack within set model experiments.Hydroxyethylidenebis(phosphonic acid), conjugated with naphthalimide (HEDP-F), two fluoresceine-tagged polyacrylates (PAA-F2 PAA-F2S) are tested.It demonstrated that all three ASs efficient CaCO3 retardation: PAA-F2S>PAA-F2>HEDP-F.The similar efficiency found case CaHPO4•2H2O: PAA-F2S>PAA-F2 >>HEDP-F.At same time, PAA-F2S PAA-F2 affect crystal habit both CaHPO4•2H2O, while HEDP-F does not.However, due visualization it there no direct relevance between scale inhibition efficacy an ability growth kinetics form deposit.The major effect detected at nucleation step: increase induction time.However, definite decrease rate stages following registered relative blank run.Meanwhile, most AS molecules stay aqueous phase till end formation only then do they begin get adsorbed deposit.Notably, CaCO3, reveal selective sorption on vaterite, bit less intensive flake-like modification calcite least rhomboherdal surfaces.In way, demonstrate location plate-like modifications but presence pellet-like this mineral.It shown correlation rate.The observed effects interpreted terms interactions natural nanoimpurities acting as crystallization centers step.

Language: Английский

Citations

4
Calcium sulfate scale: A review of state-of-the-art DOI
Isah Mohammed, Søren W. Svenningsen, Fadhil S. Kamounah

et al.

Geoenergy Science and Engineering, Journal Year: 2024, Volume and Issue: 242, P. 213228 - 213228

Published: Aug. 12, 2024

Language: Английский

Citations

4
Calcium Precipitates as Novel Agents for Controlling Steam Channeling in Steam Injection Processes for Heavy Oil Recovery DOI Open Access
Guolin Shao,

Zhuang Shi,

Yunfei Jia

et al.

Processes, Journal Year: 2025, Volume and Issue: 13(5), P. 1319 - 1319

Published: April 25, 2025

Unconventional heavy oil reservoirs are particularly susceptible to steam breakthrough, which significantly reduces crude production. Profile control is a crucial strategy used for stabilizing production and minimizing costs in these reservoirs. Conventional plugging agent systems the thermal recovery of currently fail meet high-temperature, high-strength, deep profile requirements this process. Precipitation-type calcium salt blocking agents demonstrate long-term stability at 300 °C concentrations up 250,000 mg/L, making them highly effective channeling blockage during injection stages recovery. This study proposes two types precipitation-type agents: CaSO4 CaCO3 crystals. The precipitation behavior was investigated, their dynamic growth patterns were examined. sulfate exhibits slower crystal rate, allowing single-solution injection, while carbonate precipitates rapidly, requiring dual-solution injection. Both incorporate scale inhibitors delay crystals, aids control. Through microscopic visualization experiments, micro-blocking characteristics within pores compared, elucidating positions precipitated salts under porous conditions. Calcium crystals preferentially precipitate block larger pore channels, whereas more evenly distributed throughout reducing reservoir’s heterogeneity. final single-core displacement experiment demonstrated sealing properties systems. developed exhibit excellent performance.

Language: Английский

Citations

0
Homogeneous Organic Crystal Nucleation Rates in Solution from the Perspective of Chemical Reaction Kinetics DOI Creative Commons
Sven L. M. Schroeder

Crystals, Journal Year: 2024, Volume and Issue: 14(4), P. 349 - 349

Published: April 6, 2024

It is demonstrated for 11 different combinations of organic solutes and solvents that the supersaturation dependence homogeneous crystal nucleation rates from solution can be predicted solubility, bar a single empirical rate constant, when it assumed takes place in reversible aggregates solvated formed supersaturated solutions. Reversible solute aggregation represents natural density fluctuations take any solute/solvent system. For thermodynamically ideal solutions, steady state size distribution, thus population solution, quantitatively overall concentration by simple mathematical expression. Supersaturation creates an excess with sizes exceeding largest aggregate saturated solution. shown number these proportional to experimental rates, suggesting equation has only one parameter, namely, constant specific combination. This determined standard data. The system-specificity appears encoded solely transformation large into nuclei. driving force triggering events likely extremely high local supersaturation, which provides conditions spatiotemporally aligned bond-breaking (e.g., de-solvation) bond-forming solute–solute bonding) create stable possible influence heterogeneous solid impurities considered.

Language: Английский

Citations

3
Potential Nano/Microcenters of Crystal Nucleation in Reagent-Grade Purity Solvents and Their Differentiation by Fluorescent-Tagged Antiscalant DOI Creative Commons
Konstantin Popov,

Yuri G. Vainer,

Gleb Silaev

et al.

Crystals, Journal Year: 2024, Volume and Issue: 14(7), P. 650 - 650

Published: July 15, 2024

A common issue in studies on liquid-phase chemical processes is that the natural solid nanoimpurities present reagent-grade chemicals are ignored. Little known about these impurities’ nature, sizes, concentrations, and behavior, yet they significantly affect efficiency of antiscalants municipal laboratory solutions. Recent research has focused on: (i) estimating nanoimpurity concentrations in-house deionized water semiconductor-grade isopropanol using “light sheet” optical ultramicroscopy, (ii) visualizing antiscalant sorption impurities. Using a fluorescent-tagged aminobis(methylenephosphonic acid) (ADMP-F), we tracked its affinity to particulate matter KCl Our study showed total concentration nanoparticles with size larger than 20 nm 106 units/mL 105 isopropanol. Extrapolation values ≥1 resulted 1011 108 units/mL. The addition or ADMP-F increased foreign nanoparticle populations. selectively adsorbed by only some impurities, while most molecules remain as true solution. To our knowledge, this first instance fluorescently labeled aminoalkylphosphonates being able differentiate traces purity Therefore, role crystallization centers should be seriously reconsidered, especially their important application scale inhibition.

Language: Английский

Citations

2
Fluorescent-tagged antiscalants as a tool of homogeneous membrane scaling mitigation and inhibition mechanism investigation in electrodialysis processing of solutions prone to calcium sulfate precipitation DOI Creative Commons
Vicente Gil,

M. V. Porozhnyy,

Maxim Oshchepkov

et al.

International Journal of Corrosion and Scale Inhibition, Journal Year: 2023, Volume and Issue: 12(4)

Published: Dec. 24, 2023

The application of antiscalants (ASs) is a widely used method for scale inhibition in various water treatment technologies, being economically sound and rather simple terms technical implementation.However, despite its advantages, this has not found wide electrodialysis.This study focuses on reducing the scaling homogeneous cation-exchange membrane by using fluorescent electrodialysis processing solutions prone to calcium sulfate precipitation.Two novel are tested: 1,8-naphthalimide-based bisphosphonate (HEDP-F) fluorescein-tagged polyacrylate (PAA-F2).It shown that studied themselves do cause any significant change transport properties CSE (Astom, Japan) under conditions an applied electric current.Chronopotentiometry scanning electron microscopy results reveal antiscaling effectiveness both inhibitors at sub-stoichiometric concentrations.PAA-F2 be more efficient than HEDP-F, completely preventing deposition surface during three-hour experiment.Fluorescence reveals field, HEDP-F forms distinct phase does interact with deposit structure, as it was detected previously absence current.Apparently, mechanism activity primarily involves blocking impurities function crystallization centers precipitate.It suggested PAA-F2 blocks solid efficiently since polymeric AS.

Language: Английский

Citations

2
Enhancement of Polyacrylate Antiscalant Activity during Gypsum Deposit Formation with the Pretreatment of Aqueous Solutions with Spruce Wood Shavings DOI Open Access

Maria Trukhina,

Konstantin Popov, Maxim Oshchepkov

et al.

Materials, Journal Year: 2023, Volume and Issue: 16(19), P. 6516 - 6516

Published: Sept. 30, 2023

Considerable efforts are made worldwide to reduce inorganic scale in reverse osmosis plants, boilers and heat exchangers, evaporators, industrial water systems, geothermal power plants oilfield applications. These include the development of new environmentally friendly antiscalants improvement conventional ones. The present report is dedicated unconventional application spruce wood shavings combination with polyacrylate (PAA-F1) a model case gypsum formation. electrical conductivity freshly prepared solutions saturation SI = 2.3 concentration 0.05 mol·dm-3 was analyzed over time at 25°C. It demonstrated that small amounts (0.1% by mass) alone, after being contact CaCl2 Na2SO4 stock for 15 min, increase induction tind 25 min relative blank experiment (tindblank). In presence PAA-F1 (0.1 mg·dm-3), difference Δtind - tindblank constitutes 110 whereas sequential treatment followed injection gives 205 min. observed synergism associated selective removal colloidal Fe(OH)3solid Al(OH)3solid nanoimpurities from via their sorption well-developed surface wood. Wood therefore represent very promising material can significantly improve effectiveness antiscalants.

Language: Английский

Citations

2
A Critical Review of Relative Scale Inhibition Performance of Different Alternatives DOI
Konstantin Popov,

Maria Trukhina,

Sergey Tkachenko

et al.

Published: June 21, 2024

A critical review of scale inhibition mechanisms and relative evaluation substoichiometric antiscalant performance are presented. It is shown that such widely accepted efficacy as masking calcium (barium, strontium) ions by formation complexes; ability to impart electrostatic charge the colloids; change crystalline nature sediment; provide "threshold effect" interacting with spontaneously formed nuclei sparingly soluble salt unlikely main contribution phenomenon. At same time, it isolation crystallization templates solid nanoimpurities key importance in retarding nucleation. Numerous examples direct visualization molecules using fluorescently labeled inhibitors illustrate this point. Besides, controversy about inhibitors, provided different screening methods, discussed. In context, necessity elaborating uniform protocol for obligatory test conditions emphasized.

Language: Английский

Citations

0