A process for the manufacture of sulphur-containing ammonium...

C - Chemistry – Metallurgy – 05 – B

Patent

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C05B 7/00 (2006.01) C05G 3/00 (2006.01)

Patent

CA 2506093

The invention relates to a process for the manufacture of sulphur-containing fertilizers comprising the steps of: (a) mixing ammonia, phosphoric acid and water in a reactor unit to obtain an ammonium phosphate mixture;. (b) introducing the mixture obtained in step (a) into a granulator unit to obtain granules, wherein a liquid phase comprising elemental sulphur is brought into contact with ammonia, phosphoric acid and water in the reactor unit in step (a) or is introduced in the granulator unit in step (b). The invention further relates to sulphur-containing ammonium phosphate fertilizers, to the use of these sulphur~containing fertilizers to promote the growth of agricultural products and to the agricultural products thus-obtained.

L'invention concerne un procédé de fabrication de fertilisants renfermant du soufre. Ce procédé consiste : (a) à mélanger de l'ammoniac, de l'acide phosphorique et de l'eau dans un groupe réacteur afin d'obtenir un mélange de phosphate d'ammonium ; (b) à introduire le mélange ainsi obtenu dans un groupe granulateur afin d'obtenir des granules. Une phase liquide comprenant du soufre élémentaire est soit mise en contact avec de l'ammoniac, de l'acide phosphorique et de l'eau dans le groupe réacteur dans l'étape (a), soit introduite dans le groupe granulateur dans l'étape (b). L'invention concerne également des fertilisants à base de phosphate d'ammonium renfermant du soufre, l'utilisation de ces fertilisants renfermant du soufre afin de stimuler la croissance de produits agricoles et les produits agricoles ainsi obtenus.

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