Description

Phthalic anhydride is a versatile intermediate in organic chemistry, in part because it is bi-functional and cheaply available. Hydrolysis  by hot water forms ortho-phthalic acid. Hydrolysis of anhydridesis not typically a reversible process. Phthalic acid is however easily dehydrated to form phthalic anhydride. Above **0℃,phthalic anhydride re-forms.
 

The primary use of phthlic anhydride is as a chemical intermediate in the production of plastics from vinyl chloride. Phthalate esters,which function as plasticizers, are derived from phthalicanhydride. Phthalate plasticizers are used for the production of flexible PVC products such as cables, pipes and hoses, leather cloth,shoes,film for packaging etc.

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