METHODS AND SYSTEMS FOR TREATING CAUSTIC MATERIALS

摘要

Methods and systems for treating caustic materials are disclosed. In one exemplary embodiment, a method for treating caustic materials includes the steps of providing a first caustic solution stream including phenolic constituents and naphthenic constituents, mixing the first caustic solution stream with an acid solution, and separating phenolic acids from the first caustic solution stream. The method further includes further mixing the first caustic solution stream with additional acid solution and separating naphthenic acids from the first caustic solution stream. Still further, the method includes providing a second caustic solution stream including sulfidic constituents, mixing the first caustic solution stream with the second caustic solution stream to form a combined caustic solution stream, and oxidizing the sulfidic constituents of the combined caustic solution stream.

主权项

1. A method for treating caustic materials comprising the steps of:
providing a first caustic solution stream comprising phenolic constituents and naphthenic constituents, the first caustic solution stream having a pH greater than about 7.0; mixing the first caustic solution stream with an acid solution to reduce the pH of the first caustic solution stream to a pH of about 3.5 to about 4.5, thereby chemically transforming the phenolic constituents of the first caustic solution stream to phenolic acids; separating the phenolic acids from the first caustic solution stream; further mixing the first caustic solution stream with an additional acid solution to reduce the pH of the first caustic solution stream to a pH of about 1.5 to about 2.5, thereby chemically transforming the naphthenic constituents of the first caustic solution stream to naphthenic acids; separating the naphthenic acids from the first caustic solution stream; providing a second caustic solution stream comprising sulfidic constituents, the second caustic solution stream having a pH greater than about 7.0; mixing the first caustic solution stream with the second caustic solution stream to form a combined caustic solution stream, the combined caustic solution stream having a pH that is more neutral than either the first or second caustic solution streams individually; and oxidizing the sulfidic constituents of the combined caustic solution stream.