| 摘要 |
PROBLEM TO BE SOLVED: To recover crude oil, etc., flowed out into sea water by scattering the hydrophilic colloidal solution of natural-rubber latex and a high-molecular emulsion and a coagulant such as magnesium chloride, calcium chloride, etc., and forming a coagulated latex film. SOLUTION: Latex and a coagulant are scattered separately into water containing oil and diffused around oil, and a coagulated latex film is formed and recovered. Synthetic-rubber latex and a hydrophilic high-molecular emulsion such as polyvinyl acetate may also be used besides natural-rubber latex as latex. Polyvalent metallic ions, an organic acid, etc., are employed as the coagulant, but magnesium chloride and calcium chloride are most preferable. Oil is taken in by using a lipophilic high-molecular emulsion in oil adhering on a rock, etc., coagulated, gelled and recovered. The nonyl phenol ether, etc., of an emulsifier are added to the natural-rubber latex as the lipophilic high- molecular emulsion. Accordingly, oil flowed out into the sea, etc., and oil adhering on the surfaces of the rock, etc., can be recovered simply.
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