Oil / water separation method for o / w emulsion and oil / water separator for o / w emulsion

摘要

[PROBLEMS] To provide water in which tar and crude oil-derived components form an o / w emulsion, such as waste water produced in a coke oven at an ironworks, atmospheric distillation equipment at an oil refinery, FCC, RFCC, and desalter effluent. Efficient oil-water separation. An oil / water separation method of an o / w type emulsion comprising adding a phenolic resin to an o / w type emulsion containing a component derived from tar and / or crude oil. Preferably further coagulants are added, particularly preferably organic coagulants. By adding a phenolic resin, oil-water separation can be efficiently performed in a short time, and treated water with less oil content can be obtained. Since the phenolic resin is not an inorganic substance, the separated oil can be reused without any problem even if mixed in the separated oil. [Selection figure] None