| 摘要 |
FIELD: chemistry.SUBSTANCE: aqueous ammonium salt solution is reacted with an organic extraction agent selected from a group comprising amines of general formula(0). R, Rand Rare independently identical or different, branched or straight, optionally substituted hydrocarbon residues or a hydrogen atom H, and the salt is split at temperature and pressure at which the aqueous solution and the extraction agent are in liquid aggregate states. An auxiliary medium is added for stripping the carrier gas in order to remove NHfrom the aqueous solution, and a portion of the formed free organic acid is converted to the organic extraction agent. The organic acid is 2-hydroxyisobutyric acid and the extraction agent is dialkylamine. Freed ammonia is removed from the aqueous solution by a continuous gas stream and can be returned to the production process. The free acid can be extracted from the extraction agent using a method such as distillation, rectification, crystallisation, reverse extraction, chromatography, adsorption or by membrane methods.EFFECT: cheap non-polluting method carried out without a salt load and which includes complete recovery through a closed cycle.14 cl, 3 dwg, 8 ex |
