Phosphorus pentasulfide waste water treatment

Details Phosphorus pentasulfide waste water treatment Phosphorus pentasulfide waste water treatment

1980-06-05

1981-11-17

Therkorn, Ernest G.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210754, 210759, 210760, 210906, 423303, C02F 152

Patent

active

043010148

ABSTRACT:
The process disclosed in this invention takes the waste solids, gases, and water from a phosphorus pentasulfide manufacturing facility and hydrolyzes the phosphorus pentasulfide by heating. The phosphorus portion is converted to a soluble phosphate and the sulfur portion to a mixture of sulfide, sulfite and sulfate. The soluble fraction is then treated with a calcium hydroxide solution precipitating the phosphate and sulfates which are removed. The gaseous portion of the hydrolysis is fed to a catalytic oxidizer which converts the sulfides to sulfur, which is removed and the gas, free of sulfur containing species, is exhausted to the atmosphere. The filtrate from the precipitation reaction can be recycled to the plant, or may be chlorinated and discharged.

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patent: 4173532 (1979-11-01), Keoteklian

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