Production principle and technical formula of sodium 2,4-diaminobenzene sulfonate

2,4-diaminobenzene sulfonic acid sodium salt (2,4-diaminobenzene sulfonic acid sodium salt) is also known as m-phenylenediamine-4-sulfonic acid sodium salt, and its molecular formula is C ₆ H ₇ N ₂ NaO ₃ S, molecular weight is 210.
18, structural formula is

1.
Product performance

Light yellow monoclinic crystal, easily soluble in hot water, slightly soluble in cold water
.
Slowly turn brown in the air

2.
Laboratory preparation method

Add 340mL water, 8mL hydrochloric acid and 60g reduced iron powder to a three-necked flask , heat to boiling, add 50g 2,4-dinitrobenzenesulfonic acid , reflux for 2h, and then neutralize with soda ash to pH 7.
5-8.
0, After filtering the iron slag, the filtrate is concentrated, cooled and crystallized, filtered with suction, and washed with water to obtain sodium 2,4-diaminobenzene sulfonate
.

3.
Production principle

The iron powder reduction method is mainly used
.
2,4-Dinitrochlorobenzene is used as raw material, after sulfonation, it is reduced with iron powder to prepare 2,4-diaminobenzenesulfonic acid, and then sodium carbonate is added to neutralize the crude product, and then it is concentrated in vacuum, crystallized and centrifuged.

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Sulfonation reactor, filter, salting out pot, centrifuge, reduction pot, vacuum concentration pot, crystallization pot

Related links: Production process and quality inspection of 4,4'-diaminodiphenylamine-2-sulfonic acid