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

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                    PRODUCTS

                    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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