| 摘要 |
The invention relates to a process for the removal of acids from reaction mixtures, comprising at least one product of value which is sparingly soluble in water, by means of at least one unpolar amine as auxiliary base, comprising the following steps: a) reacting the auxiliary base with the acid with formation of a salt; b) reacting the salt formed in step a) with a further base, which accepts the acid with liberation of the auxiliary base; c) extraction of the mixture obtained in step b) with water or an aqueous medium, where the salt of the further base dissolves 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 form at least one separate nonaqueous phase; and d) removal by distillation of the auxiliary base and/or at least part of the solvent which is optionally present from the at least one nonaqueous phase obtained in step c), it being possible for two nonmiscible liquid phases to form. The invention furthermore relates to a process for the preparation of thiophosphoric triamides, to the thiophosphoric triamides obtained in accordance with this process, and to the use of these thiophosphoric triamides as additive to urea-comprising mineral and/or organic/mineral fertilizers. |
