Production process and product standard of 1-naphthylamine-7-sulfonic acid

6.

Refined naphthalene is put into the sulfonation kettle and then nitrated, neutralized and reduced to obtain magnesium 1-naphthylamine-6-sulfonate, magnesium 1-naphthylamine-7-sulfonate and magnesium 1-naphthylamine-8-sulfonate (see 1-naphthylamine-6-sulfonic acid production process)

7.

8.

Content determination: Take about 50g of a uniform wet material sample, dry it at 105°C to a constant weight, and grind it in a mortar

In the formula: V ₁ ——the volume of the standard sodium nitrite solution used to titrate the sample, mL;

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

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

G——The mass of the sample, g

9.

Used as an intermediate for azo dyes (direct light fast red brown RTL, direct light blue B2RL) and sulfur dyes (such as sulfur blue CV)

10.

(1) If naphthalene, concentrated sulfuric acid, concentrated nitric acid and other toxic and corrosive materials are used in production, the equipment should be sealed to prevent leakage, ventilation should be strengthened in the workshop, and the operators should wear labor protection equipment

(2) Packed in iron drums lined with plastic bags, stored in a cool, ventilated and dry place, protected from moisture and heat.

Related links: 1-Naphthylamine-7-sulfonic acid product performance and production principle