Based on the current worldwide trend of using 1

2

4

5-tetraaminobenzene (TAB)and its hydrochloride (TAB·4HCl)in new materials and absence of relevant study in China

a new method of synthesizing polymer grade monomer TAB·4HCl was studied

systematic analysis and optimization was made for the synthesis process

and the relationship of the ammonolysis selectivity with pressure and temperature were clarified. The results showed that 4

6-dinitro-1

3-phenylenediamine (DADNB)was prepared by double ammonolysis reaction at 1.0 MPa pressure in 1

4-dioxane solvent from 1

3-dichloro-4

6-dinitrobenzene (DCDNB)ammonia as ammonolysis agent

and then hydrogenated in methanol solvent

the solution containing TAB was obtained after the hydrogenation liquid was decolored with active carbon

then TAB·4HCl was obtained by adding hydrochloric acid and concentrating under reduced pressure and filtering

with 99.3% purity and 79.7% total yield. Finally

with synthesis reliability of 99% and good practical value

a plan for solvent recovery and recycling was proposed for commercialization of TAB·4HCl production.