Calcium sulphate scale prevention in a desalinatïon unit using the SMCEC technique

Ahmed, Samia ben; Tlili, Mohamed; Amor, Mohamed Ben; Bacha, Habib Ben; Elleuch, B.

doi:10.1016/j.desal.2004.06.140

Cited by 40 publications

(26 citation statements)

References 6 publications

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“…In previous works, within the framework of a study on the limiting of gypsum scale formation in the heat transfer surfaces of a desalination unit using solar energy and evaporation -condensation principle, it was shown at laboratory scale that the sodium salt of poly(acrylic acid) based compound known as RPI is the most efficient compared with others commercial products (Permatreat 191: amino phosphate; STP: sodium triphosphate Na 5 P 3 O 10 ; Flocon 260: a mixture of polycarboxylate and organic phosphate) [20]. It was also shown that the polyacrylate inhibitor does not affect gypsum precipitation in the same way when it precipitated from an initial supersaturated solutions or from a solutions saturated by evaporation.…”

Section: Introductionmentioning

confidence: 99%

“…Most authors explained this inhibitory power by the adsorption of these additives onto crystal growth sites of nascent crystals altering their surface proprieties. Other authors [16][17][18][19][20] were interested in the application of polyacrylates as scale inhibitors. The main advantage in using polyacrylates lies in their excellent thermal stability compared with polyphosphates and other copolymers [16].…”

Section: Introductionmentioning

confidence: 99%

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Influence of a polyacrylate antiscalant on gypsum nucleation and growth

Ahmed

Tlili²,

Amor

2008

Cryst. Res. Technol.

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Calcium sulphate dihydrate (gypsum) crystallization was studied under conditions, of supersaturation and temperature, simulating a brackish water desalination unit using solar energy. The effect of an commercial sodium salt of poly(acrylic acid), based compound known as RPI, on homogeneous nucleation and growth of gypsum was also examined. Gypsum was precipitated by mixing aqueous CaCl 2 and Na 2 SO 4 solutions. It was found that, with increasing temperature or supersaturation, the induction time decreases and the growth rate increases. By using classical nucleation theory, the interfacial tension and the nucleation rate values were estimated. It was shown that the interfacial tension is temperature dependent. The addition of increasing quantities of RPI, in the same conditions of temperature and supersaturation, prolongs the induction time, decreases the nucleation rate and increases the interfacial tension. The addition mode of RPI (in calcium or in sulphate solution) was found as an important parameter in controlling the inhibition process of gypsum crystallization. XRD and SEM analysis showed that RPI antiscalant strongly affected the texture and the morphology of the deposit gypsum.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of a polyacrylate antiscalant on gypsum nucleation and growth

Ahmed

Tlili²,

Amor

2008

Cryst. Res. Technol.

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“…Les polyphosphates et les polyacrylates sont les familles de tartrifuges généralement utilisées à cause de leur susceptibilité à former des liaisons avec les cations (Ca 2+ ) [4][5][6][7]. Ceci leur permet d'être efficace même à faible dose.…”

Section: Introductionunclassified

“…Cet inhibiteur était efficace pour empêcher la précipitation du sulfate de calcium à partir d'une solution synthétique sursaturée. Dans un travail antérieur [7], nous avons testé différents types d'inhibiteurs (polyacrylates, polyphosphates) sur la cinétique de précipitation du sulfate de calcium à 142 JOURNAL DE PHYSIQUE IV partir d'une solution sursaturée préparée par la méthode de double décomposition. Nous avons montré que le polyacrylate de sodium est l'inhibiteur le plus efficace.…”

Section: Introductionunclassified

Étude de l’effet d’un polyacrylate et d’un polyphosphate sur la morphologie et la minéralogie du sulfate de calcium

et al. 2004

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Abstract. The retarding influence of polyacrylate and polyphosphate on the nucleation of calcium sulphate was investigated. SEM analyses show that these inhibitors didn't only influence the nucleation kinetics but also the precipitate morphology by adsorption onto crystal growth sites. The influence of different concentrations of the additives on the mineralogy of solid precipitated was also examined. Spectroscopy Raman analyses showed that the calcium sulphate can precipitate under different phases, gypsum (CaSO 4 .2H 2 O), hemihydrate (CaSO 4 .1/2H 2 O) and / or anhydride (CaSO 4 ), as function of inhibitors concentrations.

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“…It was shown that manganese and copper ions are antagonistic to the performance of acrylate-based polymers but the adverse impact is not as great as with Fe 3+ . Recently, Ahmad et al [4] investigated the performance of various additives (e.g., sodium salt of aminotris(methylene phosphonate), sodium tripolyphosphate, sodium polyacrylate, a blend of polycarboxylate and phosphonate) as gypsum scale inhibitors. Results of this study reveal that gypsum scale inhibition strongly depends on the concentration and the type of inhibitor tested.…”

Section: Introductionmentioning

confidence: 99%

Performance of phosphonates as copper(II) ions stabilization agents for industrial water systems

Amjad

2015

Int. J. Corros. Scale Inhib.

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Copper(II) salts have long been used to kill algae in water systems, but they can precipitate as insoluble salts and form deposits on equipment surface. It is important to remove toxic metal from industrial waste because of contamination and toxicity issues. This paper discusses the testing and effects of various phosphonates to control copper-based fouling in the industrial water systems. It has been found that Cu(II) ions stabilization (complexation, precipitation, dispersion, etc.) strongly depends on solution pH, reaction time, and phosphonate concentration. Results on the evaluation of various phosphonates suggest the following order, in terms of decreasing effectiveness: HEDP ≈ HPA > PAPEMP > AMP >> PBTC.

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Calcium sulphate scale prevention in a desalinatïon unit using the SMCEC technique

Cited by 40 publications

References 6 publications

Influence of a polyacrylate antiscalant on gypsum nucleation and growth

Influence of a polyacrylate antiscalant on gypsum nucleation and growth

Étude de l’effet d’un polyacrylate et d’un polyphosphate sur la morphologie et la minéralogie du sulfate de calcium

Performance of phosphonates as copper(II) ions stabilization agents for industrial water systems

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