Phthalic Anhydride → Naphthalene

HRID 465705Notes

Reaction equation

HRID 465705 reaction equation
[CH:1]1[CH:2]=[CH:3][C:4]2[C:11](=O)[CH:10]=[CH:9][C:7](=O)[C:5]=2[CH:6]=1.C1(=O)OC(=O)C2=CC=CC=C12>>[CH:6]1[C:5]2[C:4](=[CH:11][CH:10]=[CH:9][CH:7]=2)[CH:3]=[CH:2][CH:1]=1

Participants

3

Reactant 2

HCID 6811Phthalic AnhydrideHCID 85301,4-Naphthoquinone

Product 1

HCID 931Naphthalene

Procedure

In a process for separation of naphthoquinone from an aqueous slurry prepared by contacting, with an aqueous medium, a reaction mixture gas containing naphthoquinone and phthalic anhydride formed by a catalytic vapor phase oxidation of naphthalene, an improvement characterized in that naphthoquinone having a purity of higher than 95% in a form of a solution or a powder is separated by adjusting the pH of said aqueous slurry to 1.2 to 5 and extracting naphthoquinone with a straight or branched chain saturated hydrocarbon or cyclic saturated hydrocarbon at 60° to 110° C. under the condition of substantially dissolving phthalic acid in the aqueous phase and leaving resinous materials separated as a bottom phase and separating a solvent solution of naphthoquinone.

Workup

  1. customIn a process for separation of naphthoquinone from an aqueous slurry
  2. customprepared

Sources & evidence

ORD record
ord-2e7b39e76e6e44848b2af224eb6aa8b5
Source dataset
uspto-grants-1992_10
Patent number
US05153339

Reaction notes

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