Industrial water systems: problems, challenges and solutions for the process industries

Demadis, Konstantinos D.; Mavredaki, Eleftheria; Stathoulopoulou, Aggeliki; Neofotistou, Eleftheria; Mantzaridis, Chris

doi:10.1016/j.desal.2006.01.042

Cited by 114 publications

(52 citation statements)

References 15 publications

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“…As in our previous studies [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], we used the "yellow molybdate" method (using Spectrophotometer HACH DR/890) as follows: 2 mL from the working solution is filtered through a 0.45 μm syringe filter and then diluted to 25 mL in a special cylindrical cell of 1 cm path length, made of quartz. Next, 1 mL of ammonium molybdate stock solution and 0.5 mL of HCl (1:1 dilution of the concentrated solution) are added to the sample cell, the solution is shaken well and left standing for 10 min.…”

Section: Determination Of Molybdate-reactive Silicamentioning

confidence: 99%

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The interplay between cationic polyethyleneimine and anionic polyelectrolytes for the control of silica scale formation in process waters

Spinthaki¹,

Stathoulopoulou²,

Demadis³

2015

Int. J. Corros. Scale Inhib.

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Stabilization of mono-and disilicic acids is accomplished by using a cationic polymeric chemical additive, polyethyleneimine (PEI), in supersaturated silica solutions (the starting solution contained 500 ppm/8.3 mM sodium orthosilicate, Na 2 SiO 3 ·5H 2 O, expressed as SiO 2 ) at pH = 7. The PEI polymeric system contains an excess of amine groups (~25% primary amines, ~50% secondary amines and ~25% tertiary amines) that become protonated at circumneutral pH, hence charging the molecules positively. PEI was found to be efficient as a silica scale inhibitor only at the low dosage of 10 ppm. Its inhibitory activity was found to drop as its concentration increased. It was hypothesized that PEI is entrapped into the colloidal silica matrix and deactivated. Thus, one way to maintain its activity was to create blends of PEI and anionic polymers. Anionic polyelectrolytes that were tested included polyacrylic acid (PAA), phosphonated polyacrylic acid (PAA(PO 3 H 2 ) 2 ), carboxymethylinulin (CMI), poly(acrylamide-co-acrylic acid) (PAM-co-AA), phosphonomethylated chitosan (PCH) are also studied for their silica scale inhibition efficiency. It is observed that the silica inhibitory activity of PEI was improved upon its combination with anionic polyelectrolytes.

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Section: Determination Of Molybdate-reactive Silicamentioning

confidence: 99%

“…It was found that its inhibitory efficiency increased as a result of these synergistic mixtures. This research is part of our on-going investigation on the discovery and application of scale inhibitors in industrial process waters [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. …”

Section: Introductionmentioning

confidence: 99%

The interplay between cationic polyethyleneimine and anionic polyelectrolytes for the control of silica scale formation in process waters

Spinthaki¹,

Stathoulopoulou²,

Demadis³

2015

Int. J. Corros. Scale Inhib.

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“…15),18) CMI is also reported as a silica scale remover. 19) CMI is produced from a chemical reaction with a plant-derived biopolymer and select reagents. 20) This biopolymer, inulin, 21) is extracted from the roots of the chicory plant (dry matter content: 2025%, inulin content: 14.918.3%).…”

Section: )7)mentioning

confidence: 99%

The inhibitory effects of inulin biopolymers on the seeded growth of hydroxyapatite

Doğan

Öner

Cinel

2010

J. Ceram. Soc. Japan

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In this work crystallization kinetics of hydroxyapatite (HAP) were investigated in the presence of a biodegradable, environmentally friendly polysaccharide-based polycarboxylate, carboxymethyl inulin (CMI), under strictly controlled temperature, pH, and atmospheric conditions. The constant-composition method has been used to study the influence of biopolymers of crystal growth of HAP, on HAP seed crystals at pH 7.4 and 37°C. The results indicate that polymer concentration and the larger number of negatively charged functional groups markedly affect the growth rate. Biopolymer affects the coherence length of the crystalline domain. The decrease in growth rates was substantiated by SEM which showed smaller crystal sizes as a function of increasing carboxylation degree of the CMI and its concentration.

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“…Corrosion can damage the materials which are used to construct automobiles, pipeline systems (water, oil), bridges and buildings, petroleum refineries, and so forth [1]. Corrosion inhibitors have long been used for the daily operation of recirculating cooling water system, industrial acid cleaning, oil well acidification, and descaling due to their economical and efficient properties [2][3][4]. Most of these organic compounds contain nitrogen, sulphur, oxygen, and multiple bonds in the molecules which are adsorbed on the metal surface and the organic compound [5,6].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Inhibition Effect of Carbon Steel in Sea Water by L-Arginine-Zn²⁺System

Gowri

Sathiyabama

Rajendran

2014

International Journal of Chemical Engineering

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The inhibition efficiency of L-Arginine-Zn 2+ system in controlling corrosion of carbon steel in sea water has been evaluated by the weight-loss method. The formulation consisting of 250 ppm of L-Arginine and 25 ppm of Zn 2+ has 91% IE. A synergistic effect exists between L-Arginine and Zn 2+ . Polarization study reveals that the L-Arginine-Zn 2+ system functions as an anodic inhibitor and the formulation controls the anodic reaction predominantly. AC impedance spectra reveal that protective film is formed on the metal surface. Cyclic voltammetry study reveals that the protective film is more compact and stable even in a 3.5% NaCl environment. The nature of the protective film on a metal surface has been analyzed by FTIR, SEM, and AFM analysis.

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Industrial water systems: problems, challenges and solutions for the process industries

Cited by 114 publications

References 15 publications

The interplay between cationic polyethyleneimine and anionic polyelectrolytes for the control of silica scale formation in process waters

The interplay between cationic polyethyleneimine and anionic polyelectrolytes for the control of silica scale formation in process waters

The inhibitory effects of inulin biopolymers on the seeded growth of hydroxyapatite

Corrosion Inhibition Effect of Carbon Steel in Sea Water by L-Arginine-Zn²⁺System

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Industrial water systems: problems, challenges and solutions for the process industries

Cited by 114 publications

References 15 publications

The interplay between cationic polyethyleneimine and anionic polyelectrolytes for the control of silica scale formation in process waters

The interplay between cationic polyethyleneimine and anionic polyelectrolytes for the control of silica scale formation in process waters

The inhibitory effects of inulin biopolymers on the seeded growth of hydroxyapatite

Corrosion Inhibition Effect of Carbon Steel in Sea Water by L-Arginine-Zn2+System

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Product

Resources

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Corrosion Inhibition Effect of Carbon Steel in Sea Water by L-Arginine-Zn²⁺System