Process for the purification of waste water

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

1977-12-14

1979-03-20

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

568742, 568753, 568751, 568738, 568769, C02C 504

Patent

active

041452836

ABSTRACT:
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 wet oxidation with oxygen or oxygen-containing gases at temperatures of from about 100.degree. to 370.degree. C. and under a pressure of from about 1 to 300 bars. The COD-decomposition rates amount to about 90% and more.
When a hydroxy aromatic is prepared by means of a caustic soda melt, this process provides a sulfate, especially sodium sulfate, which is of sufficient purity for further use without complementary purification stages. The obtention of the pure salt is important for the economy of the process.

REFERENCES:
patent: 2665249 (1954-01-01), Zimmerman
patent: 2760992 (1956-08-01), Schoeffel et al.
patent: 2856437 (1958-10-01), Cake
patent: 3426083 (1969-02-01), Otten et al.
patent: 3907678 (1975-09-01), Pradt et al.
patent: 4026791 (1977-05-01), Wallace
Lund, H. F., Industrial Pollution Control Handbook, McGraw Hill, Inc.; 1971, pp. 14-19 through 14-22.

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