PRODUCTION OF POTASSIUM MONOPERSULFATE TRIPLE SALT USING OLEUM

World Intellectual Property Organization Patent

APP PUB NO WO-2005030916-A2
SERIAL NO

PCTUS2004031616

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A method of preparing a potassium monopersulfate composition is presented, wherein the potassium monopersulfate composition has the formula (KHSO5)X(KHSO4)y(K2 SO4)Z, where x+y+z=1 and x=0.46-0.64, y=0.15-0.37, and z=0.15-0.37, said potassium monopersulfate composition having an active oxygen content greater than or equal to 4.9 wt. % and K2S208 at a concentration of < 0.5 wt. % of the potassium monopersulfate composition. The method includes reacting an H2O2 solution containing at least 70 wt.% H202 with oleum at a substoichiometric ratio of oleum to H202 to generate a weak Caro's acid solution, then combining the weak Caro's acid solution with an H2SO4 solution to produce a rich Caro's acid solution. The rich Caro's acid solution may be combined with an alkali potassium compound to produce the potassium monopersulfate composition. The temperature is preferably maintained at below 30 °C during the process.

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