C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
48/46, 362/53
C02F 1/54 (2006.01)
Patent
CA 1242288
METHOD OF REDUCING THE NICKEL CONTENT IN WASTE WATER (D#77,899 -F) ABSTRACT OF THE DISCLOSURE The nickel content of a waste water stream, such as a stream of grey water that is separated in the decanting operation of a partial oxidation process or blow-down water from a gas quench cooling and/or scrubbing operation is reduced to below 1 mg/1 to produce an environmentally upgraded water stream. In the process, the dilute waste water stream containing nickel impurities at a temperature in the range of about 60 to 220°F is mixed with a water soluble material selected from the group consisting of formaldehyde, ionizable polysulfide salt, and hydrogen peroxide; and with dimethyl glyoxime. The pH is adjusted to a value in the range of over 7 to 11 by the addition of a base material and a water insoluble nickel precipitate forms. The precipitate and other insoluble matter are separated from the water by means of at least one conventional solids-liquid separator, and a stream of upgraded water is produced. At least a portion of the upgraded water stream may be recycled to the gas quench cooling and/or scrubbing operation. The nickel content of the upgraded water stream has been reduced to conform with environmental regulations. Further, build up of nickel in the recycle circulating water system and the formation of troublesome nickel carbonyl are prevented.
472377
Smart & Biggar
Texaco Development Corporation
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