Product performance and production principle of 2-chloro-5-aminobenzenesulfonic acid

2-chloro-5-aminobenzenesulfonic acid (2-chloro-5-aminobenzenesulfonic acid) is also called 4-chloroaniline -3-sulfonic acid (4-chloroaniline-3-sulfonic acid), the molecular formula is C ₆ H ₆ CINO ₃ S, the molecular weight is 207.

1.

White to light gray needle-like crystal or powder, slightly soluble in water, insoluble in ethanol and ketones, soluble in hot water, glacial acetic acid , melting point 280°C (decomposition)

2.

It is prepared by neutralizing 2-chloro-5-nitrobenzenesulfonic acid with sodium hydroxide and reducing it with iron powder in the presence of sulfuric acid

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5.

Neutralization pot, reduction reaction kettle, filter press, acid precipitation pot, suction filter, drying oven

6.

Add 320kg of 2-chloro-5nitrobenzenesulfonic acid (calculated as 100%) into the neutralization pot, pour in 700L of water (or the last batch of washing liquid), and heat to 70°C to dissolve

Add 500L of 70℃ water (or the washing liquid of the previous batch), 40kg of sulfuric acid (calculated as 100%) into the reduction reaction kettle, and alternately add 200kg of 60 mesh iron powder and the above 2-chloro-5-nitrobenzene sulfonate in 10 times Sodium solution, the temperature is controlled at 100℃, and the pH is 5～5.

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8.

Determination of diazonium value: Weigh about 2g of dry to constant sample, weigh to 0.

The diazo value is calculated as follows:

In the formula: V——the volume of sodium nitrite solution consumed by the sample, mL;

V ₁ ——The volume of sodium nitrite solution used in the blank experiment, mL;

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

G-sample quality, g;

0.

9.
Product use

Dye intermediates
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10.
Security measures

(1) This product is highly toxic and can cause poisoning if inhaled or swallowed or absorbed through the skin
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The equipment should be tightly closed during production to prevent leakage.
Operators should wear protective equipment to prevent accidental clothing or skin contamination
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(2) The product is packed in wooden barrels or iron barrels lined with plastic bags, and stored in a cool, ventilated, and dry place, protected from heat, moisture, and fire
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Store and transport in accordance with toxic chemicals regulations
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Related Links: Product Standards and Product Uses of 2-Naphthol-6,8-Dipotassium Disulfonate