E.i. Dupont De Nemours and Company

Harry O Burrus

Donald I Garnett

A process for destroying waste alkali metal hypochlorite such as sodium hypochlorite is disclosed. The process involves reacting 50-90% and preferably 70-90% of the alkali metal hypochlorite with urea at from 20.degree.-60.degree. C. and pH 6-8 with pH 7-8 being preferred. The remaining alkali metal hypochlorite can be destroyed with a reactant such as sulfur dioxide, sodium sulfite, or sodium thiosulfate.

Hypochlorite destruction using urea

Sulfur dioxide is prepared by reacting sulfur with sulfur trioxide in a medium which is sulfuric acid containing 10-65% by weight of sulfur trioxide, and which is held at a temperature of 100-150.degree. C.

Process for preparing sulfur dioxide

Formaldehyde in crude BYD, can be reacted to a polymeric substance in the presence of NaOH or Na.sub.2 CO.sub.3 at high temperatures.

Reaction of formaldehyde in butynediol

There is disclosed an improvement in the process of manufacturing HF wherein sulfur accumulates in HF process equipment. The improvement comprises adding to the process equipment sufficient SO.sub.3 to remove the sulfur and emptying the equipment.

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Wilmington, DE, United States of America

Harry O Burrus