Spent caustic treatment

Details Spent caustic treatment Spent caustic treatment

1992-02-04

1993-09-14

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210761, B01D 1104

Patent

active

052445763

ABSTRACT:
A process is provided for treating a sulfide-containing alkaline aqueous effluent to improve its environmental acceptability, which comprises: (a) intimately mixing a water-immiscible solvent, such as a pyrolysis gasoline, therewith for a sufficient time to extract polymerizable hydrocarbon compounds and/or other compounds which may cause fouling of downstream plant, (b) allowing the solvent phase and the aqueous phase to separate, (c) removing the solvent phase, and (d) subjecting the separated aqueous phase to an oxidation treatment which oxidizes sulfide ions to environmentally acceptable sulfur acid ions, particularly sulfate ions, e.g. a wet air oxidation process. The invention has been particularly developed for treating spent caustic which has been used to scrub gases produced by cracking for ethylene production. Such effluents have been found to cause fouling of the oxidation plant and the Applicants have found that this is due to polymerizable hydrocarbons. Furthermore they have found that prolonged contact times between a readily available solvent and the effluent can ensure that the fouling problem is cured.

REFERENCES:
patent: 3761409 (1973-09-01), McCoy et al.
patent: 3963611 (1976-06-01), Dardenne-Ankringa, Jr.
patent: 4179365 (1979-12-01), Sumi
patent: 4347144 (1982-08-01), Bodenbenner et al.
patent: 4372940 (1983-02-01), Brandenburg et al.
patent: 4417986 (1983-11-01), Connaught et al.
patent: 4584107 (1986-04-01), Odaka et al.
patent: 4666689 (1987-05-01), Maple et al.
patent: 4746434 (1988-05-01), Grieves et al.
patent: 4793931 (1988-12-01), Stevens et al.
patent: 4948511 (1990-08-01), Swanson et al.
Chen et al., "Spent Caustic Treatment and Disposal" Proceedings of the 42nd Industrial Waste Conference May 1987.
Sitting, M. "Petroleum Refinery Industry", Energy Saving and Environmental Control .RTM.1978.
A. G. Smith, "Ridding Process Waters and Caustic Solutions of Sulphides", Oil and Gas Journal, Jul. 9, 1956 pp. 95-99.
J. D. Martin and L.D. Levanus, "New Column Removes Sulfide with Air", Hydrocarbon Processing and Petroleum Refiner, 41 May 1962, pp. 149-153.
Otto Abegg, "A Plant for the Oxidation of Sulphide-Containing Refinery Wastes by Air", Erdol and Kohl, Erdgas, Petrochemie vol. 14 No. 8, pp. 621-626 (1961).
Otto Abegg, "A Plant for the Oxidation of Sulphide-Containing Refinery Wastes by Air", Erdol and Kohl, Erdgas, Petrochemie vol. 15, No. 9, pp. 721-722 (1962).

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