Do you know the use of crotonic acid? Properties and uses of crotonic acid

[alias]crotonic acid, trans-2-butenoic acid.

[Molecular formula]C4H6O2

[Structural formula]CH3CH=CHCOOH

[Properties] There are three isomers of crotonic acid. Among them, crotonic acid is the most important because of its stable properties, and commercial products are generally crotonic acid. Crotonic acid is a colorless crystal with a relative density of 1.018 (15°C), a melting point of 71.4-71.7°C, a boiling point of 185°C, a flash point of 87.8°C, and a refractive index of 1.4228 (80°C). Soluble in water, the aqueous solution is acidic, the solubility in 100mL of water (25°C) is 9.4g, easily soluble in warm water, ethanol, ether, acetone and toluene. It can be transformed into isocrotonic acid in toluene solution. This product is an unsaturated fatty acid with strong reaction ability, can be polymerized, and can also undergo reactions such as halogenation, amination and esterification.

［Application］Organic synthesis raw material for the synthesis of methyl crotonate, cellulose crotonate, crotonic anhydride, butyl Alkenoic acid, acid chloride, etc. It is also used in the manufacture of synthetic resins, drugs, spices, coatings, plasticizers, fungicides, adhesives, film developing agents and electrostatic copying agents, etc.

[Brief recipe]

①Using crotonaldehyde (or crotonaldehyde) as raw material, oxidized by air or oxygen in the presence of copper acetate-cobalt acetate (or silver powder) catalyst And made.

②Acetaldehyde can be condensed with malonic acid in the presence of pyridine in anhydrous ether to produce crotonic acid.

[Safety and Protection]Packed in paper drums or galvanized iron drums with inner village plastic bags, each drum has a net weight of 10kg or 20kg (stored in a cool place) Dry place. Storage and transportation according to general chemical regulations.

This product is non-toxic, but it is irritating to the skin, and its irritation is similar to that of acrylic acid.