Potassium Chloride → 2-Chloroanthraquinone

Participants

Reaction Conditions

Reaction Steps

1,200 l of 10% strength sodium chlorate solution are added in the course of 4 hours to 150 kg of anthraquinone-2-sulphonic acid (Na salt), (produced according to Ullmann, Encyclopadie der technischen Chemie (Encyclopaedia of Industrial Chemistry), 4th Edition, Volume 7, page 589; Bios Final Report 1484) with 90 kg of potassium chloride in 2,745 l of water and 255 l of sulphuric acid (96%) at 100° C. in an enamelled 6 m3 kettle, while stirring (30- 40 revolutions per minute) and the mixture is stirred for a further 5 hours at 100° C. The mixture is filtered at 80° C. through a filter press, the material on the filter is washed with hot water until the filtrate gives a neutral reaction and the filter cake is dried, 2-Chloroanthraquinone of the following composition: about 3% of anthraquinone, about 95% of 2-chloroanthraquinone, about 1% of 1-chloroanthraquinone and about 1% of insoluble matter is obtained.

Provenance & Evidence