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.

Real-time monitoring of calcium sulfate scale removal from RO desalination membranes using Raman spectroscopy

Desalination ◽  
2021 ◽  
Vol 497 ◽  
pp. 114736
Author(s):  
Danielle J. Park ◽  
Omkar D. Supekar ◽  
Alan R. Greenberg ◽  
Juliet T. Gopinath ◽  
Victor M. Bright
Keyword(s):  
Raman Spectroscopy ◽  
Real Time ◽  
Calcium Sulfate ◽  
Real Time Monitoring ◽  
Scale Removal ◽  
Calcium Sulfate Scale

The Kinetics and Mechanism of Formation of Calcium Sulfate Scale Minerals—The Influence of Inhibitors

CORROSION ◽  
1979 ◽  
Vol 35 (7) ◽  
pp. 304-308 ◽  
Author(s):  
GEORGE H. NANCOLLAS ◽  
WESLEY WHITE ◽  
FELIX TSAI ◽  
LARRY MAS LOW
Keyword(s):  
Calcium Sulfate ◽  
Mechanism Of Formation ◽  
Seeded Growth ◽  
Langmuir Adsorption ◽  
Calcium Sulfate Dihydrate ◽  
Calcium Sulfate Scale ◽  
Rate Of Reaction ◽  
Growth Method ◽  
Kinetics Of ◽  
Calcium Sulfate Hemihydrate

Abstract A seeded growth method has been used to study the kinetics of crystallization of calcium sulfate dihydrate at various temperatures and at ionic strengths up to 0.6M. Under all conditions, the rate of reaction is proportional to the square of the relative supersaturation and is controlled by a surface process. The same kinetics are applicable for the growth of calcium sulfate hemihydrate at temperatures above 110 C. The organic phosphonates effectively retard scale formation, and diethylenetriaminepenta (methylenephosphonic acid), when present at a concentration as low as 10−7M, completely inhibits the growth of calicum sulfate hemihydrate at 120 C. By assuming that the inhibitor molecules are adsorbed on growth sites on the surface of the crystals, the inhibition can be interpreted in terms of a simple Langmuir adsorption isotherm.

Removal and Inhibition of Calcium Sulfate Scale in Waterflood Projects

1968 ◽  
Vol 20 (11) ◽  
pp. 1249-1256 ◽  
Author(s):  
C.F. Smith ◽  
T.J. Nolan ◽  
P.L. Crenshaw
Keyword(s):  
Calcium Sulfate ◽  
Calcium Sulfate Scale

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.

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