| 摘要 |
PURPOSE:To concentrate an org. acid from a low concn. org. acid aqueous solution in high selectivity and high flow flux, by using a membrane wherein the void parts of a porous polymer membrane are impregnated with trioctylphoshine oxide and paraffin. CONSTITUTION:A polymer porous membrane is impregnated with a mixture consisting of trioctylphosphine oxide (TOPO) forming colloid along with an org. acid and paraffin diffusing said colloid. TOPO pref. occupies 30-85% of a total liquid wt. The polymer membrane has a max. pore size of 1mum or less, a void ratio of 20% or more, a membrane thickness of 200mum or less and also has piercing pores in the front and back surfaces thereof and pref. has a property not chemically reacting with a liquid impregnant or an org. acid. The base material of the membrane is pref. a hydrophobic one.
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