Production process and product standard of sodium 1-naphthylamine-4-sulfonate

5.

Sulfonation reactor, neutralization pot, concentration pot, filter, crystallization pot, drying box

6.

Add 1-naphthylamine into the sulfonation reactor, heat it to melt, and then add concentrated sulfuric acid dropwise with stirring

Cool the sulfonated material to below 80°C, add water to dilute, and add soda ash to neutralize to a pH of 8-9.

Add dichlorobenzene to the neutralized solution , stir, and heat to 80°C

7.

8.

1) Assay

Accurately weigh 20g of the sample, place it in a 500mL beaker, and add 200mL of hot distilled water (40-60°C) to dissolve it

Where: V—— The volume of NaNO ₂ standard solution consumed by the sample , mL;

V ₁ ——The volume of NaNO ₂ standard solution consumed in the blank experiment , mL;

c—— The molar concentration of NaNO ₂ standard solution, mol/L;

G——The mass of the sample, g

2) Determination of 1-naphthylamine content

After extraction with benzene, titrate with 0.

9.

Used as an intermediate for azo dyes, used in the production of direct red and acid red dyes and instead of β-naphthylamine for the manufacture of fluorescent whitening agents

10.

(1) The raw material 1-naphthylamine has carcinogenic toxicity.

(2) This product is toxic.

Related links: Production principle and process flow of sodium 1-naphthylamine-4-sulfonate