Patent ID: 9227929
Filing Date: 2016-01-05
CPC Classification: C07C

Claim Text:
1. A continuous-flow process for sulfonating 1,2-diaminobenzene with 100% yield, the continuous-flow process comprising: introducing a sulfonation mixture into a microreactor inlet of a continuous-flow microreactor to produce a flow of the sulfonation mixture through the continuous-flow microreactor, the sulfonation mixture comprising 1,2-aminobenzene dissolved in a molar excess of sulfuric acid, the continuous-flow microreactor comprising one individual fluidic module or a plurality of sequentially connected individual fluidic modules, wherein: maintaining a reaction temperature of from 180° C. to about 220° C. in at least the at least one residence module while the sulfonation mixture flows from the microreactor inlet to the microreactor outlet for a total residence time from 25 to 60 minutes; receiving the sulfonation mixture from the microreactor outlet; and precipitating a sulfonated reaction product out of the sulfonation mixture received from the microreactor outlet.