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Maleic acid (also called cis-butenedioic acid), a
white crystals easily soluble in water, acetone, and alcohol, is an
unsaturated organic dibasic acid which carboxylic acid groups are next to
each other in the cis form. Its trans form isomer is fumaric acid, both
are used in making polyesters, alkyd resins, plasticizers and lubricating
oils. Maleic acid is prepared commercially by the oxidation of
benzene. Maleic acid is used in the manufacture of fumaric acid and
other chemical products as a carboxylating agent. It is used as an
oil and fat preservative and food acidulated.
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