Naphthalene-1-sulfonic acid Naphthalene-1-sulfonic acid
Structural formula
| Business number | 01VV |
|---|---|
| Molecular formula | C10H8O3S |
| Molecular weight | 208.23 |
| label |
1-Naphthalenesulfonic acid, α-Naphthalenesulfonic acid, 1-Naphthalenesulfonic acid, C10H7SO3H |
Numbering system
CAS number:85-47-2
MDL number:MFCD00003987
EINECS number:201-610-1
RTECS number:None
BRN number:None
PubChem number:24851215
Physical property data
1. Characteristics: prismatic white crystals, recrystallized from dilute hydrochloric acid containing 2Molecular crystal water
2. Density (g/mL ,25/4℃): Undetermined
3. Relative vapor density (g/mL, Air=1): Undetermined
4. Melting point (ºC):90 ℃ (hydrate),139-140 ℃ (anhydrous).
5. Boiling point (ºC,Normal pressure): Undetermined
6. Boiling point (ºC,5.2 kPa): Undetermined
7. Refractive Index: Undetermined
8. Flash point (ºC): Undetermined
9. Specific optical rotation (º ): Undetermined
10. Autoignition point or ignition temperature (ºC): Undetermined
11. Vapor pressure (kPa, 25ºC): Undetermined
12.
Synthesis method
Obtained from the sulfonation of naphthalene with chlorosulfonic acid. The sulfonation reaction uses o-nitroethylbenzene as the solvent, and the molar ratio of naphthalene, chlorosulfonic acid and o-nitroethylbenzene1：1.1：3match, in0-5℃Carry out sulfonation reaction, and the purity is97%of1-Naphthalenesulfonic acid. If using98% Sulfuric acid is used as the sulfonating agent, and the reaction temperature is 0-40℃, the obtained sulfonate contains 1 –Naphthalenesulfonic acid83 -85%,2 –Naphthalenesulfonic acid15 -17%, adding magnesium salt or sodium salt can separate the precipitated2-Filter out the magnesium salt or sodium salt of naphthalenesulfonic acid. Contains free1-naphthalene The filtrate of sulfonic acid is concentrated, cooled, crystallized, filtered, washed and dried to obtain the finished product.
Purpose
Used for Manufacturing1-Naphthol , 1-Naphthol Sulfonic acid, 1- Naphthylamine sulfonic acid and other intermediates.
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