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Polymeric Silica Scale Inhibitors: Computational Predictions And Experimental Studies On Inhibitor Efficiencies

Picture for Polymeric Silica Scale Inhibitors: Computational Predictions And Experimental Studies On Inhibitor Efficiencies
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Inorganic scaling and fouling are undesirable processes occurring in process waters that are supersaturated with respect to scaling cations and anions. Mineral scaling is the result of nucleation and crystal growth phenomena that follow predictable pathways. This is because the mineral scales are composed of well-defined crystalline salts, the most common being calcium carbonate, calcium sulfate dehydrate (gypsum), metal sulfides, depending on the particular water chemistry and operational parameters (eg. temperature).

Product Number: 51322-17706-SG
Author: Efstratios Korhatzis, Konstantinos Xanthopoulos, Konstantinos D. Demadis
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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In the present work we present experimental and computational results on the efficacy of two simple polymers, polyethylene glycol (PEG) and polyvinyl alcohol (PVA) on silica scale inhibition. The aim of this study is to compare the experimental and computational approaches, in order to explain why PEG is an effective silica inhibitor, while PVA is not. Based on the computational studies, PVA prefers to form interactions between the polymeric chains and not between the polymeric chains and the silicic acid molecules. In contrast, PEG does induce stabilizing interactions between the polymeric chains and the silicic acid molecules. These computational predictions are confirmed by experimental scale inhibition studies, which prove indeed that PEG is an efficient silica scale inhibitor, whereas PVA is not.

In the present work we present experimental and computational results on the efficacy of two simple polymers, polyethylene glycol (PEG) and polyvinyl alcohol (PVA) on silica scale inhibition. The aim of this study is to compare the experimental and computational approaches, in order to explain why PEG is an effective silica inhibitor, while PVA is not. Based on the computational studies, PVA prefers to form interactions between the polymeric chains and not between the polymeric chains and the silicic acid molecules. In contrast, PEG does induce stabilizing interactions between the polymeric chains and the silicic acid molecules. These computational predictions are confirmed by experimental scale inhibition studies, which prove indeed that PEG is an efficient silica scale inhibitor, whereas PVA is not.

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Picture for Ph-Responsive Copolymers As Silica Scale Inhibitors
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Ph-Responsive Copolymers As Silica Scale Inhibitors

Product Number: 51322-17703-SG
Author: Georgia Skordalou, Konstantinos D. Demadis
Publication Date: 2022
$20.00

Silicon is an important element of our Planet’s crust, which is transferred into water streams through dissolution.1 Hence, it is usually found as water-soluble silicate or colloidal silica in natural surface waters (sea, rivers, lakes), or underground waters. When such water is used for industrial purposes (eg. industrial cooling), silicate can enter the operating system and can pose a threat to its proper operation. The main reason is the solubility of amorphous silica, a product of the silicate polycondensation process.
Picture for Polymer Architecture Effect On Zinc Ions Stabilization In Aqueous Systems
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Polymer Architecture Effect On Zinc Ions Stabilization In Aqueous Systems

Product Number: 51322-17727-SG
Author: Zahid Amjad, Peter G. Koutsoukos, Panagiota D. Natsi
Publication Date: 2022
$20.00

Fouling of equipment surface by unwanted materials is a well-documented problem in
industrial water systems.1 The foulants are generally classified into four categories: a)
mineral scales i.e., calcium carbonate, calcium sulfate, calcium phosphate, magnesium
hydroxide, etc., b) corrosion products i.e., iron oxide, zinc oxide, copper oxide, etc., c)
microbiological mass i.e., bacteria, algae, fungi, and other organisms, and d) deposits
i.e., clay, silt, calcium-inhibitor salts, corrosion products, etc.
Pitting Corrosion Resistance Of UNS S32202 Welds: Bulk Microstructure Vs Surface Behaviour
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Pitting Corrosion Resistance Of UNS S32202 Welds: Bulk Microstructure Vs Surface Behaviour

Product Number: 51322-17913-SG
Author: Veronica SCHEIBER, Pauline HUGUENIN, Jérôme BRIDEL, Florent KRAJCARZ, Vincent VIGNAL
Publication Date: 2022
$20.00

Duplex stainless steels (DSS) are an attractive alternative to conventional austenitic 300 series. They are becoming more and more present in industrial applications requiring high mechanical properties combined with good corrosion resistance.  UNS S32202 is a lean duplex grade designed to guarantee corrosion resistance superior to that of 304L in most environments and even equivalent to 316L in NaCl environment at room temperature. Its yield strength is twice as high as 304L and 316L allowing thickness and weight reduction in structural components. With low nickel content (2.5%) and no molybdenum addition, the impact of raw material price fluctuation is reduced. It makes UNS S32202 suitable for a high number of applications including public transportation, building & construction, watersystems, liquid storage and pulp&paper industry. 
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