Abstract
Abstract Solvent extraction of cyanamide and dicyandiamide (1-cyano-guanidine) from aqueous ammoniacal solution with Aliquat 336 dissolved in Shellsol T has been studied. Extraction isotherms with different ionic forms of the anion-exchanger are reported for the separation of the compounds of interest as well as for mixtures of the solutes. The optimum organic phase consists of a mixture of 10% (v/v) 2-ethylhexanol and 30% Aliquat in Shellsol T. With this phase the influence of temperature, extractant concentration, and the effect of changing ammonia concentration in the feed solution on the degree of extraction as well as the selectivity between the components have been investigated. In addition, experiments with different reextractants have been examined for the recovery of cyanamide and dicyandiamide. The evaluation of a physical chemical model for the extraction mechanism is done with the support of a computer program.
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