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6.
Production process
In the nitrosation reactor, add 1800L of 80°C hot water and 128kg of sodium hydroxide (calculated as 100%)
.
Under stirring, add 461kg β-naphthol (calculated as 100%) within 30min, and the temperature is 75~80℃, and stir until it is completely dissolved
7.
Product Standard
8.
Quality inspection
Assay: Accurately weigh 16g of the sample, add 50mL of 10% soda ash, dilute to a 500mL volumetric flask, and add water to the mark
.
Use a pipette to draw 50mL into a 600mL beaker, add 50mL of 10% soda ash and 200mL of distilled water, titrate with 0.
In the formula: c——molar concentration of aniline diazonium standard solution for titration, mol/L;
V——The volume of aniline diazonium standard solution consumed by the sample, mL;
G——The mass of the sample, g
.
9.
Product use
Used as acid mordant dye and acid complex dye intermediate, used in the manufacture of acid complex peach red B, acid mordant black R, acid complex salt GGN, acid mordant claret BN, etc.
; also used for colorimetric determination of phosphate and calcium Salt; also used in organic synthesis
.
10.
Security measures
(1) The raw materials β-naphthol, sodium nitrite, etc.
are poisonous, the equipment should be sealed, the operators should wear labor protection equipment, and the workshop should be well ventilated
.
(2) This product is toxic.
It is packed in wooden barrels lined with plastic bags, sealed and protected from light in a cool and dry place, protected from heat and moisture
.
Store and transport in accordance with toxic chemicals regulations