Process for the purification of waste water

Details Process for the purification of waste water Process for the purification of waste water

C - Chemistry, Metallurgy

02

F

362/11, 260/618.

C02F 3/26 (2006.01) C01D 5/00 (2006.01) C02F 11/08 (2006.01)

Patent

CA 1086873

PROCESS FOR THE PURIFICATION OF WASTE WATER Abstract of the Disclosure: The waste water being formed upon the preparation of hydroxy aromatics, preferably of resorcinol and .beta.-naphthol, by caustic alkaline melt of the corresponding aryl-sulfonic acids or aryl sulfonates is purified by a wet oxidation with oxygen or oxygen-containing gases at temperatures of from about 100 to 370°C and under a pressure of from about 1 to 300 bar. The COD- decomposition rates amount to about 90% and more. This process provides a sulfate, especially sodium sulfate, which is sufficiently pure for further use without com- plementary purification stages, if the hydroxy aromatics are prepared by means of a caustic soda melt. The obtention of the pure salt is important for the economy of the process.

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