Industrial fertiliser, created during caprolactam production and containing nitrogen in ammonium form and sulphur in the form of sulphuric anhydride. It also contains a small amount of ammonium nitrate, the concentration of which does not exceed 1.5 %. In recent years, particularly in connection with the desulphurisation of power plants, ammonium sulphate has become an increasingly important fertiliser with sulphur and ammoniacal nitrogen content. It is used for direct fertilisation or as a raw material in the production of mixed fertilisers containing sulphur.
