Ecologically Safe Method of Obtaining Bismuth (III) Tribenzoate
E. V. Timakova, T. A. Udalova, Y. M. Yukhin
Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences
Yukhin@solid.nsc.ru
Keywords: bismuth (III) oxide benzoate, bismuth (III) tribenzoate, synthesis, IR and Raman spectra, thermal analysis
Pages: 77-84
Abstract
Precipitation of bismuth (III) benzoates from hydrochloric and nitric solutions depending on the concentration of benzoate ions, process temperature and the concentration of hydrogen ions in solution was studied by means of X-ray phase analysis, IR and Raman spectroscopy, thermogravimetry and chemical analysis. It was established that, depending on synthesis conditions, precipitating compounds can be bismuth oxide benzoate BiOC7H5O2 or bismuth tribenzoate Bi(C7H5O2)3. The reasonability to obtain medical bismuth tribenzoate from metal bismuth after its preliminary oxidation with atmospheric oxygen was demonstrated. The formed bismuth oxide is dissolved in nitric acid (1 : 1), and bismuth (III) tribenzoate is precipitated by adding the bismuth-containing solution to the solution of sodium benzoate at the molar ratio of benzoate ions to bismuth equal to 3.0-3.2, and process temperature (70±10) °C.
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