Proces for preparing potassium peroxomonosulphate triple...

Details Proces for preparing potassium peroxomonosulphate triple... Proces for preparing potassium peroxomonosulphate triple...

C - Chemistry, Metallurgy

01

B

C01B 15/08 (2006.01)

Patent

CA 2168901

The invention relates to a process for preparing the potassium peroxomonosulphate triple salt 2 KHSO5KHSO4 K2SO4 by partial neutralisation of a Caro's acid fed to a working solution containing KHSO5 and KHSO4 with caustic potash solution and evaporation of water. According to the invention, the cold crystallisation procedure hitherto required is avoided and a high active oxygen yield is produced by using a Caro's acid with 50 to 70 wt.% of H2SO5 and 15 to 30 wt.% of H2SO4 and a working solution with a concentration of 28 to 38 wt.% of KHSO4, 18 to 28 wt.% of KHSO4 and greater than 0 to 3 wt.% of K2SO4 and supplying additional sulphuric acid, wherein the molar ratio of H2SO5 to added H2SO4 to KOH is 3 to 1 : 3 to 5 : 8.

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