Purification of barium values
First Claim
1. A process for the production of a purified barium salt essentially devoid of strontium impurities, comprising extracting an aqueous solution of impure barium values with an organic solvent medium which comprises at least one of the following substantially water-insoluble organic extractants:
- (i) a carboxylic acid having the following general formula (I);
##STR11## in which R1 and R2 are straight or branched chain alkyl radicals, or substituted such alkyl radicals, with the proviso that the total number of carbon atoms present in said two radicals is at least equal to 6;
(ii) a phosphonic acid monoester having the following general formula (II);
##STR12## in which R'"'"'1 and R'"'"'2 are straight or branched chain, nonhalogenated alkyl or alkenyl radicals;
(iii) an 8-hydroxyquinoline having the following general formula (III);
##STR13## in which R3, R4, R5, R`hd 6, R7 and R8, which may be identical jor different, are each hydrogen, or a substituted or unsubstituted alkyl, alkenyl, alicyclic or aromatic radical, with the proviso that R3, R4, R5, R6, R7 and R8 may not all be hydrogen at the same time;
separating the mixture of extraction into a purified aqueous phase comprising the desired barium salt values and an organic phase comprising those impurity values sought to be removed; and
thence recovering said purified aqueous phase.
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Abstract
Purified barium salts essentially devoid of strontium impurities, e.g., highly pure barium carbonate, are produced by liquid/liquid extracting an aqueous solution of impure barium values with an organic solvent medium which comprises at least one water-insoluble carboxylic acid, phosphonic acid monoester, or substituted 8-hydroxyquinoline extractant. The mixture of extraction is separated into a purified aqueous phase containing the desired barium salt values and an organic phase containing the impurity values sought to be removed.
32 Citations
30 Claims
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1. A process for the production of a purified barium salt essentially devoid of strontium impurities, comprising extracting an aqueous solution of impure barium values with an organic solvent medium which comprises at least one of the following substantially water-insoluble organic extractants:
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(i) a carboxylic acid having the following general formula (I);
##STR11## in which R1 and R2 are straight or branched chain alkyl radicals, or substituted such alkyl radicals, with the proviso that the total number of carbon atoms present in said two radicals is at least equal to 6;(ii) a phosphonic acid monoester having the following general formula (II);
##STR12## in which R'"'"'1 and R'"'"'2 are straight or branched chain, nonhalogenated alkyl or alkenyl radicals;(iii) an 8-hydroxyquinoline having the following general formula (III);
##STR13## in which R3, R4, R5, R`hd 6, R7 and R8, which may be identical jor different, are each hydrogen, or a substituted or unsubstituted alkyl, alkenyl, alicyclic or aromatic radical, with the proviso that R3, R4, R5, R6, R7 and R8 may not all be hydrogen at the same time;
separating the mixture of extraction into a purified aqueous phase comprising the desired barium salt values and an organic phase comprising those impurity values sought to be removed; and
thence recovering said purified aqueous phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification