Resorcinol is also known as 1,3-dihydroxybenzene, 1,3-benzenediol, which is a kind of white needle-like crystals. It turns pink when exposed to light and air or in contact with iron, sweet and combustible. It has a melting point of 108°C, a boiling point of 280.8°C, a relative density of 1.272, a flash point of 127°C, and a self-ignition point of 607.7°C. Resorcinol is soluble in water, ethanol, and amyl alcohol, easily soluble in ether and glycerin, slightly soluble in chloroform, carbon disulfide, slightly soluble in benzene, and volatile, with moderately toxic.
(1) Resorcinol and fuming sulfuric acid are sulfonated twice, alkali neutralized to obtain isophthalic acid sodium salt, alkali fusion, acidification, and extraction and distillation with ether, isopropyl ether or n-butanol.
(2) It is produced by oxidation and hydrolysis of m-dicumene.
(3) Meta-phenylenediamine is prepared by hydrogenation of m-dinitrobenzene, which is then obtained by hydrolysis of m-phenylenediamine.
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Resorcinol is widely used in dyes, medicines, plastics, synthetic fibers and other industries. It is the raw material for the production of dyes such as acid eosin, drugs such as p-aminosalicylic acid, benzophenone series ultraviolet absorbers, photosensitive film substrate coatings, tire cord dipping and explosives.