Naphthalene → 2-Naphthalenesulfonic acid

HRID 275638

Reaction equation

HRID 275638 reaction equation
[S:1](=[O:5])(=O)([OH:3])[OH:2].[CH:6]1[C:15]2[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=2)[CH:9]=[CH:8][CH:7]=1>>[CH:14]1[C:15]2[C:10](=[CH:9][CH:8]=[CH:7][CH:6]=2)[CH:11]=[CH:12][C:13]=1[S:1]([OH:3])(=[O:5])=[O:2]

Participants

3

Reactant 2

HCID 931NaphthaleneHCID 1118Sulfuric Acid

Product 1

HCID 84202-Naphthalenesulfonic acid

Procedure

1,050 g of sulfuric acid was added to 1,280 g of naphthalene, and the reaction was carried out at 160° C. for 2 hours. Unreacted materials were separated and discharged outside the container under a reduced pressure. Then, 857 g of 35% by weight concentration formalin was added and reacted at 105° C. for 5 hours to obtain a condensation product formed by methylene type bonding of β-naphthalene sulfonic acid. After being neutralized with ammonium water, the condensation product was filtrated to yield a filtrate liquid.

Workup

  1. customUnreacted materials were separated
  2. concentrationThen, 857 g of 35% by weight concentration formalin
  3. additionwas added
  4. customreacted at 105° C. for 5 hours
  5. customto obtain a condensation product

Sources & evidence

ORD record
ord-653a541d6544467a92d3c139425373e3
Source dataset
uspto-grants-2002_03
Patent number
US06352651B1

Linked notes

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