CAS RN: 75-07-0

Reactivities / Incompatibilities

Incompatible materials: Oxidizing agents, reducing agents, acids, nitric acid, peroxides, bases, sodium hydroxide, amines, ammonia, oxygen. Warning: Acetaldehyde is oxidized rapidly and exothermically by air, to acetic acid, acid anhydrides, alcohols, halogens, ketones, phenol, hydrogen sulfide gas, hydrogen peroxide.
Reacts with oxidizing materials, halogens, amines, strong alkalies, and acids.
Oxygenation of acetaldehyde in presence of cobalt acetate at -20 deg C caused precipitation of 1-hydroxyethyl peroxyacetate (acetaldheyde hemi-peracetate), which exploded violently on stirring. Ozone or uv light also catalyzes the autoxidation.
Strong oxidizers, acids, bases, alcohols, ammonia & amines, phenols, ketones, HCN, H2S [Note: Prolonged contact with air may cause formation of peroxides that may explode and burst containers; easily undergoes polymerization].
Interaction /of hydrogen peroxide with acetaldehyde or desiccants/ gives the extremely explosive poly(ethylidene) peroxide, also formed on warming peroxidized diethyl ether.
Direct combination /of dinitrogen pentaoxide & acetaldehyde/ to produce ethylidene dinitrate at -196 deg C is violently explosive, but uneventful when the acetaldehyde is diluted with nitrogen.
Some of the products of interaction of acetaldehyde & mercury(II) salts (chlorate or perchlorate) are highly explosive & extremely shock-sensitive.
A drum contaminated with acetic acid was filled with acetaldehyde. The ensuing exothermic polymerization reaction caused a mild eruption lasting several hours.
Oxygen leaked into a free space in an acetaldehyde storage tank normally purged with nitrogen. Accelerating exothermic oxidation led to detonation.
May dissolve rubber.
May form explosive peroxides.
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