发明授权
US4980071A Substituted thioureas for the separation of complexly bound heavy-metal ions 失效
用于分离复合结合的重金属离子的取代的硫脲

Substituted thioureas for the separation of complexly bound heavy-metal
ions
摘要:
Heavy metals can be precipitated from waste water or aqueous reaction solutions containing inorganic and/or organic complexing agents with substituted thiorureas of the general formula R.sub.1 R.sub.2 N-CS-NH-COR.sub.3. N,N-dialkyl-N'-benzoyl thioureas are used with preference, whereby methyl, ethyl, n-propyl or isobutyl groups are used as alkyl substituents.
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