Phthalic acid is mainly used for preparing phthalic anhydride, and the latter is the production of dyes, perfumes, saccharin, phthalates, phenolphthalein precursor chemicals.
The preparing methods of phthalic acid:
Four chlorine naphthalene with nitric acid oxidation. The law is the earliest produce phthalic acid used in the method, reaction in four of the chlorine naphthalene by preparing naphthalene, potassium chlorate and hydrochloric acid reaction.
With fuming sulfuric acid oxidation of o-xylene, with mercury or mercury sulfate as catalyst.
Is a new method is direct oxidation catalytic naphthalene neighbors, dimethyl benzene anhydride hydrolysis.
Phthalic acid as the white crystal, melt at 210 ° C and decomposed into water and phthalic anhydride. With excess lime hot benzene.
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