Abstract
The distiller waste containing mainly calcium chloride (CaCl2) is being discharged in the Solvay process, and it has not been recycled comprehensively. In this study, a novel route for the treatment of the distiller waste was developed, in which CaCl2 solution was transformed into calcium carbonate and hydrogen chloride based on a reactive extraction–crystallization process using N235–isoamyl alcohol as the extraction system. Experimental results showed that the optimum conditions were 240min as reaction time, 20°C as the best temperature, 1.0molL−1 as initial concentration of CaCl2, 50% volume fraction of N235, 2:1 as the best phase ratio, and one-time feeding pattern. The conversion rate of CaCl2 was up to 75% under the optimized conditions; moreover, the concentration of H+ in organic phase was 0.70molL−1 and rhomibic calcite of high purity could be obtained. The products were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and thermogravimetry/differential scanning calorimetry. The extraction mechanism involved the ion-pair formation and the extraction complex R3N·HCl was determined by saturation method. The enthalpy change of the overall reaction ΔH was −36.47kJmol−1, indicating that it was an exothermic reaction with the possibility of getting hindered at high temperature.
Sign-in/Register to access full text options 
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 callDisclaimer: 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.
