Research And Design The Synthetical Process Of 4-aminotoluene-3-sulfonic Acid

4-Aminotoluene-3-sulfonic acids, the sulfonation of 4-methylaniline, is an important intermediate , is widely applied in the preparation of organic pigment, dyestuffs, etc. According to the operating way, the preparation is divided to two kind of: solid phase and fluid phase , it is a typical sulfonation of aromatic amino compounds for preparation aromatic amino sulfonic acid.The charateristic and methods for sulfonation of aromatic compounds were reviewed in this paper, the sulfonation process of 4-methylaniline with sulfonic acid. At the same time, the industrialization design of the technological project 2000 tons a year .It is in 1932 that the baking process is firstly used in sulfoniation of aromatic amine, in 1980' s, the solvent baking process or no-solvent baking overseas. In this article 4-aminotoluene-3-sulfonic acid was studied to synthesize by sulfonation using 4-methylaniline as a raw material. Via chose a kind of moderate price and to easy the non-toxic dispersing agent to take place of the organic solvent. The sulfonation reaction of 4-methylaniline is carried under factors of the sulfonation of aromatic amine, The relatively process condition was as follows: the raw material aromatic amine and the sulfuric acid allocated mol proportion is 1-1.03, adds acid time about for 1-2 hour, the salifying time about for 1-5 hour, baking reaction time for 6-20 hour, and the temperature is about 160-250℃, best for 190-230℃. Simultaneously, Selecting the vertical type reactor possessed special structure to prepare 4-aminotoluene-3-sulfonic acids, the Receives rate of the aim product is 94% with 4-methylanilineIn this foundation, has studied the sulfonation reaction process of 3-chlorine-4 -methylaniline, 3, 4-dichloraniline and so on also, has obtained the satisfactory effect.