Crotonaldehyde is produced industrially by aldol condensation of acetaldehyde followed by dehydration. Its principal commercial application is as a precursor in the synthesis of sorbic acid and potassium sorbate (E200, E202) — major food preservatives — and in the manufacture of butyraldehyde, 1-butanol, and various flavor and fragrance compounds. It is a warning agent in fuel gas and serves as an intermediate in tanning leather and rubber accelerator production.
Food-grade material is not applicable as crotonaldehyde is strictly an intermediate and does not appear in final food products. Technical grade typically ≥ 99% purity via distillation. Highly reactive and lachrymatory; requires specialized handling, refrigeration, and inhibitor addition (hydroquinone) to prevent polymerization during storage.