Quality inspection and product use of scarlet sodium salt

8.
Quality inspection

1) Determination of scarlet sodium salt content

(1) 0.
5mol/L aniline hydrochloride solution
.

Preparation: Weigh 47g of aniline, add 150mL of hydrochloric acid , dissolve it, pour it into a 1000mL brown volumetric flask, dilute with water to the mark and shake
.

Calibration: Draw 20 mL of the above aniline hydrochloride solution, pour it into a 400 mL beaker, add 200 mL of water, 15 mL of hydrochloric acid, and 1 g of potassium bromide
.

The molar concentration c of the aniline hydrochloride standard solution is calculated as follows:

Where: V ₁ ——consumption volume of sodium nitrite standard solution, mL;

c ₁ ——The molar concentration of sodium nitrite standard solution, mol/L;

V——Sampling volume of aniline hydrochloride, mL
.

(2) 0.

(3) Determination
.

In the formula: c——molar concentration of diazobenzene chloride, mol/L;

V——The difference between the volume of diazobenzene standard solution consumed during sample titration and the volume of diazobenzene standard solution consumed during blank experiment, mL;

G——The mass of the sample, g
.

2) Determination of the content of diazotized compounds (100% free J acid in the finished product)

Use a pipette to draw 100 mL of the above-prepared sample solution and 0.

In the formula: c——molar concentration of sodium nitrite standard solution, mol/L;

v——Volume consumed by sodium nitrate standard solution, mL;

G——Sample mass, g;

A——The content of scarlet sodium salt
.

9.

Mainly for dye intermediates for the manufacture Direct Orange S, Direct Fast Scarlet 4BS the like
.

10.
Security measures

(1) The raw material phosgene is highly toxic and is a strong irritating gas; J acid is toxic
.

(2) The product is toxic, packed in iron drums, and stored in a cool, dry place, away from sunlight and heat
.

Related Links: Production Principle and Process Flow of Scarlet Sodium Salt