Abstract
I. Boric acid
(1) The coexistence of salt has little bad effect upon adsorption of boric acid on polyvinyl alcohol (P.V.A.).
(2) when scarcely soluble P.V.A.-boric acid double substance is treated with hot water, boric acid is recovered as the solution of the same concentration as the original solution used for adsorption, so long as the elution process is stopped at proper stage.
II. Borax
(1) The amount of borax adsorbed on P.V.A. is more or less different by coexistent salt.
(2) When scarcely soluble P.V.A.-borax double substance is treated with acid instead of hot water, boric acid is eluted more easily with the former than with the latter.
III. Separation of boric acid from bittern by P.V.A.
(1) When artificial bittern is passed through a column of scarcely soluble P.V.A., borax only is scarcely soluble P.V.A.-borax double substance is treated with acid.
