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Synonyms
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1-naphthol-4-sulfonic acid(sodium salt)(proverb:NW acid)
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Domestic patent
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ZL 97 1 04183.0
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Structural formula
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Molecular weight
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246.17(sodium salt) 223.17(acid)
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Molecular Formula
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C10H8O4S
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Property
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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.
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Use
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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.
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Specification
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convention
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Index Name
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Top Grade Product
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Qualified Product
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Appearance
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White to light off-white powdery solid
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White to light off-white paste form solid
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Dissolved state to water
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Clear bright transparent to almost clear bright transparent
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Dissolved state to hydrochloric acid
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Clear bright transparent to almost clear bright transparent
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1-naphthol-4-sulfonic acid content (Acid)%≥
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80
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70
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Moisture %≤
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3
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3
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Water insolubles %≤
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0.1
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0.1
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1-Naphthylamine-4-sulfonic acid
(100% 1-naphthol-4-sulfonic acid计%≤)
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0
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0
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Sulfur dioxide %≤
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0
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0
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Iron ion≤(mg/kg)
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100
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100
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Specification
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Extra Best Best specification
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Index Name
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Extra Top Grade Product
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Appearance
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White to light off-white powdery solid
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Dissolved state to water
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Clear bright transparent to almost clear bright transparent
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Dissolved state to hydrochloric acid
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Clear bright transparent to almost clear bright transparent
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1-naphthol-4-sulfonic acid content
(Acid)%≥
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87
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HPLC%≥(λ:280nm)
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99
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Moisture %≤
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0.5
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Water insolubles %≤
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0.1
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1-Naphthylamine-4-sulfonic acid (100% 1-naphthol-4-sulfonic acid)%≤
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0
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Sulfur dioxide%≤
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0
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Iron ion %≤(mg/kg)
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100
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Packing & Storage & Transportation
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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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