This audit presents the modification to the dehydration stage of the chloral manufacturing.
Chloral synthesis is achieved by ethanol and chlorine reaction.
The sulfuric acid in the conventional process is separated after the distillation step and then rejected. The solvent in the low-pollution process is recycled after distillation. The chloral is separated from chlorinated by- products which are used by the plant, and from water which is slightly acidic. Polluting wastes resulting from the low- pollution technique consist of slightly acidic water. In the case of the conventional technique, sulfuric acid is rejected after dehydration.