Purification of Naphthalene by Chemical Method

Industrial naphthalene is purified with aldehyde agents. Several kinds of aldehyde agents and different types of catalyst are selected and the effects of the reagent amount or catalyst used are evaluated. Results show that: formaldehyde is a good reagent and catalyst A is a good inorganic acid catalyst. When the addition amounts of formaldehyde and catalyst A are 1.5% respectively, pure naphthalene of first grade with the purity being 99.6% and solidification point of 79.70℃ can be obtained.