Mainly produces a series of intermediate products based on naphthalene and benzene

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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計%≤)

0

0

Sulfur dioxide %≤

0

0

Iron ion≤(mg/kg)

100

100

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

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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