PROCESS FOR CONCENTRATING SULPHURIC ACID

摘要

Process for concentrating sulphuric acid Sulphuric acid is concentrated to concentrations of up to about 80% H2SO4 by multistage evaporation in which the evaporation to concentrations of 40 to 65% H25O4 is carried out at reduced pressure in circulation or falling film evaporators in which one stage of the evaporator is heated by the vapors from a subsequent horizontal evaporator in which the sulphuric acid is evaporated to concentrations of 66 to 80% H2SO4 at slightly reduced or normal or excess pressure.