| Identification | Back Directory | [Name]
Naphtalene-1,3,6-trisulfonic Acid | [CAS]
86-66-8 | [Synonyms]
2,5,7-Naphthalenetrisulfonic acid
naphthalene-1,3,6-trisulphonic acid | [EINECS(EC#)]
201-690-8 | [Molecular Formula]
C10H8O9S3 | [MDL Number]
MFCD00128840 | [MOL File]
86-66-8.mol | [Molecular Weight]
368.36 |
| Hazard Information | Back Directory | [Uses]
The total reaction mixture is nitrated, and the resulting 8-nitro derivative is reduced to give 1-aminonaphthalene-3,6,8-trisulfonic acid (Koch acid), the key intermediate in the production of the important H acid. The crude trisodium salt may be precipitated from the quenched mixture after dilution to 75 % acid strength to give a product (Azoguard) used as a diazo stabilizer. | [Definition]
ChEBI: Naphthalene-1,3,6-trisulfonic acid is a naphthalenesulfonic acid. | [Production Methods]
Naphthalene is initially sulfonated with sulfuric acid monohydrate under programmed temperature control between 80 and 145℃. Then, 65 % oleum is added gradually at 40℃ and heating is continued for 2.5 h at 145℃. Trisulfonation is complete after the further addition of 65 % oleum and heating for 3 h at 150℃. This complex procedure maximizes the formation of Naphtalene-1,3,6-trisulfonic Acid with a conversion of up to 75 %. |
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