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Phototransformation in air

Parent compound butyryl chloride and hydrolysis product butyric acid: After evaporation or exposure to air, the substance will be slowly degraded by photochemical processes.

This estimation refers to dry air. In mist, rain, droplets and aerosols hydrolysis will be the major fate process of the acid chloride due to the short half-life in aqueous solutions.Therefore this estimate may be of low relevance.


Parent compound butyryl chloride is determined to hydrolyse rapidly to butyric acid and HCL.

Hydrolysis product butyric acid: In accordance with column 2 of REACH Annex VII, the study does not need to be performed if the substance is readily biodegradable or inorganic. Butyryl chloride hydrolyses rapidly and forms butyric acid and HCl. Butyric acid is readily biodegradable, while HCl is inorganic.

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