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Production principle and process flow of 4,4'-diaminodiphenylamine-2-sulfonic acid

 Last Update: 2021-08-28
 Source: Internet
 Author: User

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4,4'-diamino diphenylamine-2-sulfonic acid (4,4-diamino diphenylamine-2-sulfonic acid) is the precursor of black group B, with a molecular formula of C ₁₂ H ₁₃ O ₃ N ₃ S and a molecular weight of 279.
3 , The structural formula is

Product performance

Yellow crystal, insoluble in water, toxic
.

It is acidic and basic (amphoteric compounds)

2.
Laboratory preparation method

In a three-necked flask, add 140 mL of water and 48 g of 2-chloro-5-nitrobenzenesulfonic acid, and neutralize with soda ash to a pH of 7.
5
.

Add 32g of paraacetaminoaniline and 5.

3.
Production principle

Condensate sodium o-chloro-m-nitrobenzene sulfonate with p-acetamidoaniline, then reduce with iron powder, neutralize and add liquid caustic soda to hydrolyze and acidify to obtain the product
.

Process flow

Technical formula (kg/t)

Main equipment

Condensation reactor, filter, reduction reactor, neutralization pot, hydrolysis pot, drying box, storage tank

Related links: Product performance and production principle of diphenylthiourea

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