Process for the recovery of sulfuric acid

Details Process for the recovery of sulfuric acid Process for the recovery of sulfuric acid

C - Chemistry, Metallurgy

01

B

23/116

C01B 17/88 (2006.01) C01B 17/90 (2006.01)

Patent

CA 2030655

A PROCESS FOR THE RECOVERY OF SULFURIC ACID ABSTRACT OF THE DISCLOSURE In the recovery of sulfuric acid from waste sulfuric acid containing metal sulfates by concentration through evaporation and removal of the solid metal sulfates, the improvement which comprises concentrating the waste sulfuric acid by evaporation to a concentration of 26 to 32% by weight H2SO4 in an evaporation stage 1 and concentrating the acid obtained by evaporation in a steam-heated evaporation stage 2 to such an extent that the water- soluble metal sulfates are partly suspended in solid form in the acid concentrated by evaporation, the vapors from evaporation stage 2 being used as heating medium in an evaporation stage 3 in which the suspension from evapora- tion stage 2 is concentrated by evaporation to a concentra- tion of 60 to 75% by weight H2SO4. As a result there is reduced consumption of steam and cooling water, reduced corrosion and shorter stoppages for cleaning. Le A 27 318

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