Modified pectin-based polymers as green antiscalants for calcium sulfate scale inhibition

Desalination ◽  
2012 ◽  
Vol 305 ◽  
pp. 31-37 ◽  
Author(s):  
Kalpana Chauhan ◽  
Rajeev Kumar ◽  
Muneesh Kumar ◽  
Praveen Sharma ◽  
Ghanshyam S. Chauhan
Keyword(s):  
Calcium Sulfate ◽  
Scale Inhibition ◽  
Calcium Sulfate Scale

Performance of a non-phosphorus antiscalant on inhibition of calcium-sulfate precipitation

2012 ◽  
Vol 66 (1) ◽  
pp. 193-200 ◽  
Author(s):  
Xiaoxu Xue ◽  
Change Fu ◽  
Na Li ◽  
Fangfang Zheng ◽  
Weiben Yang ◽  
...  
Keyword(s):  
Calcium Sulfate ◽  
Water Systems ◽  
Sem Analysis ◽  
Solution Ph ◽  
X Ray ◽  
Thermodynamics And Kinetics ◽  
Scale Inhibition ◽  
Calcium Sulfate Scale ◽  
Different Temperatures ◽  
Strong Ability

The aim of this study is to report on the performance of a novel non-phosphorus antiscalant, acrylic acid (AA)-allylpolyethoxy carboxylate (APEC), being developed for calcium-sulfate scale inhibition in industrial water systems. The performance of AA-APEC on calcium-sulfate scale inhibition was compared with that of the two commercial inhibitors, polyamino polyether methylene phosphonates (PAPEMP) and polyacrylic acid (PAA), containing the same polyethylene glycol segments or carboxyl functional groups as AA-APEC. The study indicated that AA-APEC could act as a highly effective calcium sulfate inhibitor, having strong ability to inhibit the precipitation of calcium sulfate at a dosage of 2 mg L−1, showing approximately 83.6% inhibition. The results also showed that AA-APEC dosage, the solution pH, inhibiting temperature, concentration of Ca2+, and SO42− all play important roles in inhibiting calcium-sulfate precipitation. The precipitation thermodynamics and kinetics at different temperatures were also discussed. X-ray diffractometer (XRD) and scanning electron microscope (SEM) analysis showed that AA-APEC strongly affected the texture and the morphology of the deposited calcium sulfate. Calcium sulfate has been inhibited through stabilization by adsorption onto crystal growth sites of nascent crystals altering their morphology.

Novel and green hydroxyperylene imide based fluorescent polymer for calcium sulfate scale inhibition

2021 ◽  
pp. 117730
Author(s):  
Li Li ◽  
Ying Wang ◽  
Yue Sun ◽  
Wenzhong Yang ◽  
Xiaoshuang Yin ◽  
...  
Keyword(s):  
Calcium Sulfate ◽  
Scale Inhibition ◽  
Calcium Sulfate Scale ◽  
Fluorescent Polymer

scholarly journals Preparation of carboxymethyl-quaternized oligochitosan and its scale inhibition and antibacterial activity

2013 ◽  
Vol 4 (2) ◽  
pp. 65-75 ◽  
Author(s):  
Hui-xin Zhang ◽  
Dong-xue Sun ◽  
Yu-chao Zhu ◽  
Ting-ru Yang ◽  
Xiu-hong Jin ◽  
...  
Keyword(s):  
Calcium Sulfate ◽  
Oxygen Demand ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Static Test ◽  
X Ray ◽  
Microbial Inhibition ◽  
Scale Inhibition ◽  
Calcium Sulfate Scale ◽  
Ft Ir

Carboxymethyl-quaternized oligochitosan (CMQAOC) was prepared through carboxymethylization and N-quaternization of oligochitosan (OC) which was obtained from chitosan degradation. The structure was confirmed by Fourier transform infrared spectroscopy (FT-IR), 1H-NMR, and X-ray diffraction (XRD) analysis. The performances for both scale and microbial inhibition of CMQAOC were evaluated by static test and culture flask method, respectively. The results showed that the scale inhibition rate for calcium carbonate and calcium sulfate scale were both beyond 80% with a CMQAOC dosage of 20 mg/L. With a degree of substitution for quaternary ammonia of up to 0.74, the killing rate for saprophytic bacteria and sulfate-reducting bacteria was 98.9 and 100%, respectively. The ratio of biochemical oxygen demand/chemical oxygen demand (BOD5/COD) of CMQAOC was 0.45, showing that CMQAOC is as biodegradable as OC.

scholarly journals Inhibition of Poly(ethylenediaminetetraacetic acid-diethanolamine) on Deposition of Calcium Sulfate Crystal in Simulated Industrial Water

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 544
Author(s):  
Jian-Qiu Chen ◽  
Ting-Ran Liu ◽  
Miao-Miao Sun ◽  
Yu-Zeng Zhao ◽  
Hong-Hua Ge
Keyword(s):  
Calcium Sulfate ◽  
Ethylenediaminetetraacetic Acid ◽  
Water System ◽  
Water Soluble ◽  
Gel Chromatography ◽  
Industrial Water ◽  
Inhibition Effect ◽  
Scale Inhibition ◽  
Calcium Sulfate Scale ◽  
Sulfate Crystal

Calcium sulfate scale is a typical deposit on the equipment pieces or pipes of an industrial water system. Scale inhibitors could obviously reduce the precipitation of calcium sulfate crystal. The development and research of late-model environmentally friendly polymer inhibitors are often urgent problems to be addressed. A water-soluble poly(ethylenediaminetetraacetic acid-diethanolamine) (PEDTA-DEA) was successfully synthesized by thermal polycondensation of ethylenediaminetetraacetic acid (EDTA) with diethanolamine (DEA). The polymer product was characterized by Fourier infrared spectrum (FTIR) and the molecular weight was measured by gel chromatography, which confirms the polymerization of the two monomers. The inhibition effect of the polymer against calcium sulfate deposition was studied by static scale inhibition tests. When the Ca2+ concentration is 3000 mg/L, and the dosage of the polymer inhibitor is 10 mg/L, the inhibition effect exceeds 90%. The results show that PEDTA-DEA can inhibit the precipitation of calcium sulfate and reduce the deposition of calcium sulfate scale. The precipitate of calcium sulfate collected from the static scale inhibition test solution was analyzed by FTIR, scanning electron microscope (SEM) and X-ray diffraction (XRD). The results revealed that the addition of the polymer significantly changes the calcium sulfate crystal’s growth shape. Therefore, PEDTA-DEA is a potential calcium sulfate precipitation inhibitor for the industrial water system.

Evaluation of a New Treatment to Remove Calcium Sulfate Scale: Lab Studies and Field Application.

2019 ◽  
Author(s):  
Ahmed Farid Ibrahim ◽  
Hisham Nasr-El-Din ◽  
Mohamed Abd El-baqi ◽  
Ahmed Abdelhay ◽  
Hossam Farouk ◽  
...  
Keyword(s):  
Calcium Sulfate ◽  
Field Application ◽  
Calcium Sulfate Scale ◽  
New Treatment

Effects of Organic Additives on Calcium Sulfate Scaling in Pipes

2009 ◽  
Vol 62 (8) ◽  
pp. 927 ◽  
Author(s):  
Tung A. Hoang ◽  
H. Ming Ang ◽  
Andrew L. Rohl
Keyword(s):  
Pipe Flow ◽  
Calcium Sulfate ◽  
Chemical Structure ◽  
Flow System ◽  
Organic Additives ◽  
Pipe System ◽  
Calcium Sulfate Scale ◽  
First Time ◽  
Over Time ◽  
Comprehensive Study

A comprehensive study of the effects of nine organic additives on the formation of calcium sulfate scale in a pipe system was conducted using a multiple pipe flow system. Several factors that influence the inhibitory capability of phosphonic and carboxylic additives such as their chemical structure, their concentration, and the run time were closely scrutinized. Results showed that the organic additives influence the deposition of calcium sulfate on the walls of a pipe flow system at various levels. The superiority of the phosphonic additives, especially N,N,N′,N′-ethylenediaminetetramethylenephosphonic acid (EDTP) and nitrilotrimethylenephosphonic acid (NTMP), to other organic compounds with respect to scale prevention is discussed thoroughly. For the first time, it was demonstrated that a solution with a given concentration of inhibitor that is continuously refreshed in a pipe reactor becomes less effective over time. The morphology of the scales formed in the presence of different additives is also studied, using scanning electron microscopy.

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