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Reactive extraction

High solubility of organics in water is generally a result of their functional groups. The unsubstituted hydrocarbons or aromatics have very low solubility in water. In ReX, these functional groups are targeted to form adduct, which is preferentially soluble in an organic phase. Aqueous stream is contacted with an organic phase, which consists of extractant (to form adduct) and solvent (carrier for extractant as well as adduct).

Adduct (having affinity for the organic phase) is continually removed from an aqueous phase. After completion of the process, organic phase (extract phase) is recovered by gravity separation and subjected to solvent recovery, resulting in recovery of pure organic.

Which Chemicals Can Be Recovered

A wide range of chemicals have been recovered in pure form by ReX. These include alcohols, aldehydes, ketones, acids, nitrogen containing compounds, substituted aromatics, substituted sulfonic acids, sulfoxides, pyridines, piperazines, etc. In case more than one chemical needs to be recovered, the step can be repeated with a different combination of extractant and solvent.

Typical operating cost of recovery (chemicals and energy) is 10-25 per cent of the value recovered. Counter current multistage process can be carried out to minimize the solvent ratio as well as residual concentration in the raffinate stream.

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