urbaf2

Store, of chlorobenzene

and sulphuric acid

Nitration of

chlorobenzene

Hydrolysis to dinitrophenol I Trinitration I Washing

FIG. 123. Flow sheet of the production of picric acid from chlorobenzene (Lebedev [5]).

1 - drain; 2 - storage tank for chlorobenzene; 3 - storage tank for sulphuric acid; 4 - intermediate tank for chlorobenzene; 5 - pressure-egg;
6 - intermediate tank for sulphuric acid; 7 - metering tank for sulphuric acid; 8- nitrator; 9 - diluting tank; 10 - labyrinth for sedimentation
of chlorodinitrobenzene; 11 - tank for caustic soda; 12 - metering tank for chlorobenzene; 13 - vat for washing chlorodinitrobenzene;
14 - metering tank for caustic soda; 25 - tank for hot water; 16 - tank for chlorodinitrobenzene; 17 - metering tank for chlorodinitrobenzene;
18 - reactors for hydrolysis of chlorodinitrobenzene; 19- condenser; 20 - filter for dinitrophenol from the labyrinth; 21 - filter for dinitro-
phenol; 22 - labyrinth for the sedimentation of dinitrophenol; 23 - neutralizer; 24 - diluting tank; 25 - centrifuge; 26 - truck with dinitro-
phenol; 27 - metering tank for sulphuric acid; 28 - nitrator; 29 - filter; 30 - lift; 31 - acid drains; 32 - decantation vat; 33 - titer;
34 - wash-water collector; 35 - truck with picric acid.