Product standards and uses of 1-naphthol-4-sulfonic acid

1-naphthol -4-sulfonic acid (1-naphthol-4-sulfonic acid) is also known as NW acid, 4-hydroxy-l-naphthalene sulfonic acid, The molecular formula is C ₁₀ H ₈ O ₄ S, the molecular weight is 224.

1.

Colorless flaky crystals (industrial products are white or gray slurry); toxic; melting point 170℃ (decomposition); easily soluble in water, its sodium salt is easily soluble in water and ethanol , and its alkaline solution is in the form of ferric chloride Blue

2.

4-aminonaphthalene sulfonate and sodium bisulfite undergo 1,4-addition in the presence of hydrochloric acid, and the adduct is hydrolyzed in alkaline to obtain 1-naphthol-4-sulfonic acid disodium salt, which is finally obtained by acidification 1-Naphthol-4-sulfonic acid

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Addition reactor, hydrolysis pot, filter, storage tank, acidification pot

6.

Add 600L of water, 300kg of sodium sulfate and 300kg of sodium 4-aminonaphthalenesulfonate into the addition reactor

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Determination of the content of 1-naphthol-4-sulfonic acid: Weigh 10g of the sample (with the accuracy to 0.

The error of the two measured results is not more than 0.

Where: V ₁ ——The volume of sodium nitrite standard solution consumed by the titration sample, mL;

V ₂ ——The volume of sodium nitrite standard solution consumed in the blank experiment, mL;

c——The concentration of sodium nitrate standard solution, mol/L;

G——The mass of the sample, g

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Product use

The main intermediates for dyes, such as direct ceruloplasmin for the manufacture of BR, 2R, the RB Direct Violet, Acid Red B, B Mordant purplish red
.

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Security measures

(1) Strong acids, strong alkalis and toxic raw materials are used in production.
The equipment should be sealed, the operators should wear labor protection equipment, and the ventilation in the workshop should be strengthened
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(2) This product is toxic and is packed in plastic-lined plywood barrels, stored in a cool, ventilated place, protected from moisture and sun
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Store and transport in accordance with toxic chemicals regulations
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