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Hazard Predictions

• Generates gas: Reaction liberates gaseous products and may cause pressurization
• Generates heat: Exothermic reaction at ambient temperatures (releases heat)
• Polymerization hazard: Polymerization reaction may become intense and may cause pressurization

Acetaldehyde polymerizes exothermically with acetic acid or trifluoroacetic acid, even at low temperatures (MCA Case History No. 1764, Case Histories of Accidents in the Chemical Industry, Washington, Manufacturing Chemists' Association; Fleischmann, G., R. Jira. 2002. Acetaldehyde. In Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH Verlag GmbH & Co. KGaA. (Online)). However, acetic acid is used to QUENCH runaway base-catalyzed polymerization in acrolein, often in a solution with 8% hydroquinone, 8% sodium acetate, and 84% acetic acid (Arntz, D., M. Hopp, S. Jacobi, J. Sauer, T. Ohara, T. Sato, N. Shimizu, G. Prescher, H. Schwind, and O. Weiberg. 2002. Acrolein. In Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH Verlag GmbH & Co. KGaA. (Online)).

The reaction of malonic acid and formaldehyde liberates inert CO2 gas (Walker, F. J., Formaldehyde. New York: ACS Monograph Series, 1964, pp. 347).

Potential Gas Byproducts

• Carbon Dioxide (CO2)