Method of separating acids from chemical reaction mixtures...

C - Chemistry – Metallurgy – 07 – F

Patent

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Details

C07F 9/22 (2006.01) C07B 63/00 (2006.01)

Patent

CA 2628503

The invention relates to a method of separating acids from reaction mixtures comprising at least one product of value which is of low water solubility, by means of at least one apolar amine as auxiliary base, said method comprising the following steps: a) reacting the auxiliary base with the acid to form a salt; b) reacting the salt formed in step a) with a further base which takes over the acid while releasing the auxiliary base; c) extracting the mixture obtained in step b) with water or an aqueous medium, the salt of the further base dissolving in the aqueous phase, and the product of value, or the solution of the product of value in a suitable solvent, and the auxiliary base forming at least one separate, non-aqueous phase; and d) removing, by distillation, the auxiliary base and/or at least part of any solvent present from the at least one non-aqueous phase obtained in step c), in the course of which two immiscible liquid phases may be formed. The invention further relates to a process for preparing thiophosphoramides, to the thiophosphoramides obtainable by this process, and to the use of these thiophosphoramides as an addition to urea-containing mineral and/or organic- mineral fertilizers.

L~invention concerne un procédé de séparation d~acides de mélanges réactionnels, comprenant au moins un produit de valeur ayant une faible solubilité dans l~eau, à l~aide d~au moins une amine polaire en tant que base auxiliaire, ledit procédé comprenant les étapes suivantes : a) faire réagir la base auxiliaire avec l~acide pour former un sel ; b) faire réagir le sel formé à l~étape a) avec une autre base, qui est absorbée par l~acide afin de libérer la base auxiliaire ; c) extraire le mélange obtenu à l~étape b) avec de l~eau ou un milieu aqueux, le sel de l~autre base se solubilisant dans la phase aqueuse et le produit de valeur ou la solution du produit de valeur dans un solvant approprié et la base auxiliaire formant au moins une phase distincte non aqueuse ; et d) éliminer par distillation la base auxiliaire et/ou au moins une partie du solvant éventuellement présent de la ou des phases non aqueuses obtenues à l~étape c), deux phases liquides non miscibles pouvant être obtenues. L~invention concerne également un procédé de fabrication du triamide de l~acide thiophosphorique, le triamide de l~acide thiophosphorique obtenu par ce procédé, ainsi que l~utilisation de ce triamide de l~acide thiophosphorique en tant qu~additif pour engrais minéraux et/ou organiques-minéraux contenant de l~urée.

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