Abstract
The inhibition of gypsum was investigated at 25C in aqueous 0,7 and 1,5 mol/l NaCl solutions by so- dium carboxymethylcellulose (CMC-1000, with the degree of polymerization of 1000 units).The efficiency of inhibition was estimated from measurements of the calcium concentration in the supersaturated calcium sulfate solutions (0,15 mol/l) during the precipitation process by the standard procedure of complexometric titration. It was observed that the presence of NaCl exhibits synergistic effect on the performance of CMC-1000. In the presence of CMC-1000 at 0,5 g/l inhibitor concentration and sodium chloride at 0,7 mol/l concentration induction time, preceding the formation of the gypsum, increases from 100 (without NaCl) to 630 min. Induction times at 0,1 g/l CMC-1000 and sodium chloride at 0,7 and 1,5 mol/l concentrations are 60 and 32 min respectively. The results of X- ray powder diffraction indicated that dihydrate calcium sulfate and sodium chloride present in solid phase.
Highlights
The inhibition of gypsum was investigated at 25 C in aqueous 0,7 and 1,5 mol/l NaCl solutions by sodium carboxymethylcellulose (CMC-1000, with the degree of polymerization of 1000 units).Theefficiency of inhibition was estimated from measurements of the calcium concentration in the supersaturated calcium sulfate solutions (0,15 mol/l) during the precipitation process by the standard procedure of complexometric titration
The results of Xray powder diffraction indicated that dihydrate calcium sulfate and sodium chloride present in solid phase
25.Rabizadeh T., Peacock C.L., Benning L.G. Carboxylic acids: effective inhibitors for calcium sulfate precipitation?
Summary
The inhibition of gypsum was investigated at 25 C in aqueous 0,7 and 1,5 mol/l NaCl solutions by sodium carboxymethylcellulose (CMC-1000, with the degree of polymerization of 1000 units).Theefficiency of inhibition was estimated from measurements of the calcium concentration in the supersaturated calcium sulfate solutions (0,15 mol/l) during the precipitation process by the standard procedure of complexometric titration. THE INFLUENCE OF SODIUM CARBOXYMETHYLCELLULOSE AND SODIUM CHLORIDE ON THE PRECIPITATION OF CALCIUM SULFATE DIHYDRATE В настоящей работе исследовано влияние натриевой соли карбоксиметилцеллюлозы и хлорида натрия на осаждение гипса из пересыщенных растворов сульфата кальция при 25 C. КМЦ-1000 (0,1 и 0,5 г/л) и NaCl (0,7 и 1,5 моль/л) предварительно добавляли к раствору сульфата натрия.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Вестник Пермского университета. Серия «Химия» = Bulletin of Perm University. CHEMISTRY
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
