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It is demonstrated that arsenic oxide can be extracted from materials containing also antimony oxide using a mixed solvent of 1-butanol and n-heptane. The condition is that water generated as a result of esterification is completely removed from the reaction zone as an azeotrope. The ternary liquid system water+n-heptane+1-butanol forms three binary azeotropes and a ternary saddle azeotrope. Hydrolysis...
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