CAS number：88-44-8
molecular formula：C7H9NO3S
molecular weight：187.22
EINECS number：201-831-3

English synonyms

PTMS;PTMSA;P-TOLUIDINE-2-SULFONIC ACID;P-TOLUIDINE-M-SULFONIC ACID;6-amino-m-toluenesulfonicaci;kyselina4-toluidin-3-sulfonova;p-Methylaniline-2-sulfonicaicd;p-Toluidine-2-sulfonicscid

Related categories

Sulfonic acid; Sulfinate; Organic building blocks; Dye intermediates; Aromatic hydrocarbons; Organic chemical raw materials; Solid; Chemical raw materials; Organics; Intermediates of Dyes and Pigments; Intermediates

Introduction

4-Aminotoluene-3-sulfonic acid is a kind of chemical. Toluene is used as raw material for nitration. At this time, p-nitrotoluene is mainly produced, and o-nitrotoluene is also produced by-product. After separation, p-nitrotoluene is reduced, Generate p-aminotoluene, and finally derived from sulfonation.

Chemical properties

Needle crystal. Melting point>300°C, soluble in 214 parts of water at 20°C. When meeting water at 130℃, it decomposes, and adding copper dioxide to the aqueous solution turns red.

Use

●  Dye intermediates. Coupling 4B acid with 2,3-acid can produce Pigment Red 6B and Lithorabeau Red BK; coupling with 2-naphthol can produce pigment yellow bright red BL. These pigments are widely used in the coloring of inks, plastics, rubber, wires and cables, and daily chemicals.

●  Mainly used in the production of pigments C.I.57:1 is an important intermediate of organic pigments, and can be used to synthesize pigments Brilliant Red 6B, Lithor Red BK, etc.

Production method

●  Use p-toluidine as raw material, react with sulfuric acid, and then undergo high-temperature roasting and transposition to obtain crude product, and then refine it to obtain finished product; or obtain it by transposition sulfonation in the presence of organic solvents. The process route of the solvent method is reasonable, the solvent recovery rate is high, the product quality is good (purity reaches 98.5%), and the yield is over 90%.