Process for preparation of oximes and resulting products
AssigneeComselho Nacional de Desenvolvimento Cientifico e Tecnologico CNPQ
InventorsPeter R. Seidl, Ángelo Da Cunha Pinto, Arthur R. Menzel, Roberto O. Portela Couto
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Abstract
A new oxime mixture used as an extractant for metals, prepared from natural products containing alkylated phenols such as cashew nut shell liquid using mild reaction conditions, is expressed by the formula: The oxime mixture is suitable for extracting gallium from waste effluents from ore processing, such as Bayer liquor.
Claims11
A process for preparing an aqueous suspension of oximes, comprising:
- preparing a mixture of alkyl-salicyl-aldehydes of allyl phenols by reacting cardanol with an aqueous solution of sodium hydroxide in a temperature range of 20 to 75° C., using chloroform as reagent and solvent;
- preparing a mixture of aldoxime or ketoxime by reacting the mixture of alkyl-salicyl-aldehydes or a mixture of alkyl-salicyl-ketones derived from the mixture of alkyl-salicyl-aldehydes with hydroxylamine sulfate, hydroxylamine hydrochloride or other salt of hydroxylamine;
- and
- adding the oximes to an aqueous solution to produce an aqueous suspension of oximes.
A process for preparing an oxime mixture of the formula:
- where R=C15H31, comprising:
- (a) preparing an alkyl-salicyl-aldehyde of cardanol by reacting a solution of cardanol in chloroform with an aqueous solution of sodium hydroxide at a temperature of 20 to 70° C.;
- (b) reacting the alkyl-salicyl-aldehyde of cardanol prepared in step (a) with a hydroxylamine salt to produce an oxime of said formula;
- and
- (c) suspending the oxime in an aqueous solution.
A process for the extraction of gallium from an effluent containing gallium, comprising:
- adding an aqueous suspension of an oxime mixture expressed by the formula:
- to the effluent containing gallium to produce a complex containing gallium,
- adding a strong acid to the complex to produce a gallium-contain g mixture, and
- isolating gallium from the gallium-containing mixture.
Dependencies are inferred from the claim text.