1177-44-2Relevant academic research and scientific papers
Studies of Collectors. Part 12. The Flotation of Gallium Ion with Polyphenol-type Surfactants
Koide, Yoshifumi,Sakurai, Katsuhiro,Shosenji, Hideto,Yamada, Kimiho
, p. 641 - 645 (2007/10/02)
Polyphenol-type surfactants bearing 1,2-benzenediol or 1,2,3-trihydroxybenzene units were prepared and applied as flotation collectors for Ga(3+).The surfactants exhibited a lowering of surface tension at pH 11 (32-47 dyn cm-1.Gallium(III) was highly floated (80-90percent) at pH 3-8 with equimolar Cn-1H2n-1C(O)C6H3(OH)2 (n=8 or 12) or C7H15C(O)C6H2(OH)3, but not as highly (60percent) with C12H25S4.8(CH2CHCO2H)9.5H.The floatabilities of Ga(3+) in 1 mol dm-3 NaOH were 86-99percent, those in 3 mol dm-3 NaOH were 63-67percent, and those in 5 mol dm-3 NaOH were 26-39percent by using a six-fold molar excess of Cn-1H2n-1C(O)C6H3(OH)2 (n=12 or 18).On the other hand, the floatabilities from 1-5 mol dm-3 NaOH solutions when Cn-1H2n-1C(O)C6H2(OH)3 was added were nearly constant (58-59percent with n=12 and 31-35percent with n=18).The Ga(3+) in a Ga(3+)-Al(3+) mixture was floated selectively at pH3-5 by using C7H15C(O)C6H3(OH)2 or C7H15C(O)C6H2(OH)3.Moreover, the polyphenol-type surfactants in these flotation systems were almost entirely absent (-5 mol dm-3) from 3-5 mol dm-3 NaOH solutions and little decomposed.
SYNTHESIS OF 4-OCTADECYL-3,5,6-TRICHLORO- AND 3,5-DIOCTADECYL-4,6-DICHLORO-1,2-BENZOQUINONES
Karlivan, G. A.,Zin'kovskaya, V. R.,Valter, R. E.,Neiland, O. Ya.,Gol'ding, I. R.,Sladkov, A. M.
, p. 129 - 132 (2007/10/02)
4-Octadecylpyrocatechol was obtained by acylation of pyrocatechol with stearic acid in the presence of boron trifluoride followed by reduction of the keto group.Repeated acylation and reduction of the keto group led to 3,5-dioctadecylpyrocatechol.By simul
