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    • 3. 发明公开
    • Organoaluminum electrolytes for the electrolytic deposition of high-purity aluminum
    • 有机铝 - 电解质电解铝。
    • EP0402760A1
    • 1990-12-19
    • EP90110743.3
    • 1990-06-07
    • Studiengesellschaft Kohle mbH
    • Lehmkuhl, HerbertMehler, Klaus-Dieter
    • C25D3/44
    • C25D3/44
    • The invention relates to organoaluminum electro­lytes for the electrolytic deposition of high-purity aluminum, which are characterized in that they contain mixtures of organoaluminum complex compounds of the type MF . 2 AlR₃ ( A ), wherein M represents potassium or mixtures of K with a maximum of about 15% by mole of sodium, as well as trialkylaluminum AlR₃ ( B ) which has not been complexed to an alkali metal fluoride in a molar ratio of A : B of from 4:0.6 to 4:2, as well as a polyfunctional Lewis base of the type R′-OCH₂CH₂-OR˝ ( C ) in a molar ratio of B : C of from 1:0.5 to 1:1. The organyl radicals R in A are ethyl groups (Et), methyl groups (Me) and iso-butyl groups (iBu) in a molar ratio of Et:Me:iBu as 3:m:n, wherein m and n are numerical values of between 1.1 and 0 and the sum (m+n) is from 0.75 to 1.4. As the solvent for said electrolytes there are used from 3 to 4.5 moles, relative to the amount of alkali metal fluoride employed, of an aromatic hydro­carbon which is liquid at 0 °C or a mixture of such hydrocarbons.
      The invention further relates to a process for the electrolytic deposition of high-purity aluminum by using said electrolytes.
    • 本发明涉及用于电解沉积高纯度铝的有机铝电解质,其特征在于它们含有MF型有机铝络合物的混合物。 2 AlR 3(A),其中M表示钾或钾的混合物,最多含有约15摩尔%的钠,以及未与碱金属氟化物以摩尔比A配合的三烷基铝AlR 3(B) :B为4:0.6至4:2,以及摩尔比为1:0.5至1:1的R min -OCH 2 CH 2 -OR sec(C)型的多官能路易斯碱。 A中的有机基R是Et:Me:iBu的摩尔比为3:m:n的乙基(Et),甲基(Me)和异丁基(iBu),其中m和n是数值 在1.1和0之间,和(m + n)为0.75至1.4。 作为所述电解质的溶剂,相对于所使用的碱金属氟化物的使用量,在0℃下为液体的芳族烃或这些烃的混合物使用3至4.5摩尔。 本发明还涉及通过使用所述电解质电解沉积高纯度铝的方法。