Chemical removal of thiourea from hydrochloric acid

Details Chemical removal of thiourea from hydrochloric acid Chemical removal of thiourea from hydrochloric acid

C - Chemistry, Metallurgy

02

F

362/54

C02F 1/72 (2006.01) C02F 1/76 (2006.01)

Patent

CA 1304177

ABSTRACT OF THE DISCLOSURE A chemical method of removing thiourea from spent hydrochloric acid cleaning solutions comprising the steps of: adjusting the pH to not less than 12 by addition of base to remove metal hydroxides; oxidizing thiourea to urea by the addition of at least 4 moles of hydrogen peroxide per mole of thiourea; and further oxidizing urea to nonregulated/nonhazardous compounds by the addition of at least 3 moles of a hypochlorite per mole of urea. UV analysis confirms a greater than 98% removal of thiourea from solutions containing 0.4 to 2.7 wt.% thiourea after as little as 3 hours with an exotherm, .DELTA.t, of less than 105°F.

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