The main use of maleic acid is to produce unsaturated polyester resin.
It can also produce acetaldehyde by peroxidation.
It can also be converted to butadiene diacid (which can be brominated first, then eliminated, and then hydrogenated in liquid ammonia solution of sodium).
Maleic acid has become a new sour agent in food and beverage industry. Adding proper amount of maleic acid to food and beverage can enhance the special fruit flavor and improve the taste. At present, maleic acid is mainly used in fruit juice, ready-to-drink tea, orange juice, sports drinks and other fortified fruit-flavored drinks and foods.
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