METHOD OF EXTRACTING NOVOCAIN FROM WATER SOLUTION Russian patent published in 2015 - IPC G01N33/15 B01D11/04 

FIELD: chemistry.

SUBSTANCE: method of Novocain extraction from water solutions includes the preparation of an aqueous salt solution of Novocain by its dissolution in a saturated solution of a salting-out agent, extraction and analysis of an equilibrium water phase, with the application as an extragent of a solvotrophic reagent solution in chloroform with the concentration of 10 wt %, for which purpose the aqueous salt solution of Novocain with pH 8.0±0.5 is prepared due to the application of a saturated ammonium sulphate solution as the salting-out agent and addition of an ammonium buffer solution, Novocain is extracted for 5-7 minutes with the solution of the solvotrophic reagent in chloroform with the ratio of volumes of the aqueous salt solution of Novocain and extragent of 5:1, then the aqueous saline phase is separated from the organic one and analysed by a method of UV-spectrophotometry at a wavelength of 291 nm, the concentration of Novocain in the water solution is found by means of a calibrating graph; the coefficient of distribution (D) and the degree of extraction (R, %) of Novocain is are calculated by formulae.

EFFECT: method for the extraction of Novocain from the water solution, which is characterised by expressiveness, makes it possible to realise the practically complete single extraction of Novocain from the aqueous salt solution and can be applied in the analysis of Novocain-containing water solutions.

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