Sodium naphthionate → 4-Amino-1-naphthalenesulfonic acid

HRID 1183755

Reaction equation

HRID 1183755 reaction equation
[Na+].[S:2]([O-:16])(=[O:15])([C:4]1[C:14]2[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=2)[C:7]([NH2:8])=[CH:6][CH:5]=1)=[O:3]>O>[S:2]([OH:16])(=[O:15])([C:4]1[C:14]2[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=2)[C:7]([NH2:8])=[CH:6][CH:5]=1)=[O:3]

Participants

3

Reactant 1

HCID 23665720Sodium naphthionate

Product 1

HCID 67904-Amino-1-naphthalenesulfonic acid

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

In a large beaker, add naphthionic acid sodium salt and water and stir to complete solution, pH=9.2-9.4. Slowly add hydrochloric acid, and white precipitation occurs at pH=2.2-2.4. Stir the slurry for at least 4 hours, then filter the slurry. Use the wetcake in Stage 2.

Workup

  1. customSlowly add hydrochloric acid, and white precipitation
  2. stirringStir the slurry for at least 4 hours
  3. filtrationfilter the slurry

Sources & evidence

ORD record
ord-70ff0f8d3e774f309080fa0a6d92b771
Source dataset
uspto-grants-2014_03
Patent number
US08664371B2

Linked notes

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