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| 4-hydroxynaphthalene-1-sulphonic acid |
| Synonyms |
1-naphthol-4-sulfonic acid(sodium salt)(proverb:NW acid) |
| Domestic patent |
ZL 97 1 04183.0 |
| Structural formula |
 |
| Molecular weight |
246.17(sodium salt) 223.17(acid) |
| Molecular Formula |
C10H8O4S |
| Property |
C.A number is :6099-57-6. Domestic chemical product catalog number is C0303171. Its industrial product is light off-white powder or paste form solid , easy to dissolve in water, methanol, ethanol, etc. |
| Use |
This product is azo dye intermediate, uses in the food coloring and for producing direct copper blue BR and 2R, acid red B and acidmordant bordeaux B and so on raw material intermediates. |
| Specification |
convention
Index Name |
Top Grade Product |
Qualified Product |
Appearance |
White to light off-white powdery solid |
White to light off-white paste form solid |
Dissolved state to water |
Clear bright transparent to almost clear bright transparent |
Dissolved state to hydrochloric acid |
Clear bright transparent to almost clear bright transparent |
1-naphthol-4-sulfonic acid content (Acid)%≥ |
80 |
70 |
Moisture %≤ |
3 |
3 |
Water insolubles %≤ |
0.1 |
0.1 |
1-Naphthylamine-4-sulfonic acid
(100% 1-naphthol-4-sulfonic acid计%≤) |
0 |
0 |
Sulfur dioxide %≤ |
0 |
0 |
Iron ion≤(mg/kg) |
100 |
100 |
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| Specification |
Extra Best Best specification
Index Name |
Extra Top Grade Product |
Appearance |
White to light off-white powdery solid |
Dissolved state to water |
Clear bright transparent to almost clear bright transparent |
Dissolved state to hydrochloric acid |
Clear bright transparent to almost clear bright transparent |
1-naphthol-4-sulfonic acid content
(Acid)%≥ |
87 |
HPLC%≥(λ:280nm) |
99 |
Moisture %≤ |
0.5 |
Water insolubles %≤ |
0.1 |
1-Naphthylamine-4-sulfonic acid (100% 1-naphthol-4-sulfonic acid)%≤ |
0 |
Sulfur dioxide%≤ |
0 |
Iron ion %≤(mg/kg) |
100 |
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| Packing & Storage & Transportation |
Uses the plastic woven bag inside lining plastic bag, each bag of 25kg, stores in cool, ventilated and dry place, prevent the insolation or the rain drench. |
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