METHOD OF CONTROLLING AMMONIUM SULPHATE SYNTHESIS PROCESS Russian patent published in 2010 - IPC C01C1/24 

FIELD: chemistry.

SUBSTANCE: method is proposed for controlling ammonium sulphate synthesis process through isohydric crystallisation. The initial mixture is taken from its container and taken for crystallisation in three streams: into a hydroclassifier, the bottom part of the crystalliser and through a pipe between the crystalliser and evaporator where the condensate is also fed. Crystalline ammonium sulphate in solution is taken from the hydroclassifier to a reservioir from which a portion of the solution is fed into the initial mixture container and the other into a centrifuge for separation of ammonium sulphate crystals from the mother solution coming into the initial mixture container. Ammonium sulphate crystals are taken to a drier with a heater and to a belt conveyer. Flow rate and concentration of ammonium sulphate at the inlet of the crystalliser are given as well as flow rate of concentrate supplied from the evaporator to the crystalliser, concentration of ammonium sulphate in the reservoir, content of water in ammonium sulphate at the inlet of the drier with a heater and at the input of the belt conveyer, concentration of ammonium sulphate at the outlet of the washing solution container; temperature at the outlet of the hydroclassifier and temperature in the drier are given, current in the centrifuge is given and flow rate of ammonium sulphate solution entering the initial mixture container from the ammonium sulphate solution reservoir is given as well as flow rate of the mother solution from the centrifuge, and flow rate of ammonium sulphate at the inlet of the hydroclassifier and condensate between the evaporator and the crystalliser is corrected, as well as flow rate of clarified solution coming from the ammonium sulphate reservoir to the bottom part of the crystalliser, flow rate of vapour fed into the evaporator and drier and flow rate of aqueous ammonia solution into the initial mixture container.

EFFECT: method increases output and quality of ammonium sulphate crystals obtained.

1 dwg, 1 tbl, 1 ex