Chemical removal of thiourea from hydrochloric acid

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

1989-04-04

1993-01-19

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210752, 210756, 210760, 210908, 423488, C02F 176

Patent

active

051805006

ABSTRACT:
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 a stoichimetric amount of oxidant per mole of thiourea; and further oxidizing urea to nonregulated
onhazardous 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.degree. F.

REFERENCES:
patent: 4387029 (1983-06-01), Huber et al.
patent: 4822494 (1989-04-01), McConnell

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