IMPROVED METHOD OF ISOMERISATION OF ALPHA-ACIDS OF HOP USING HETEROGENEOUS CATALYSTS BASED ON ALKALI-EARTH METALS Russian patent published in 2016 - IPC C12C3/12 

FIELD: measurement equipment.

SUBSTANCE: according to the method raw hop containing alpha-acids is put in contact with mixed oxide or hydroxyapatite of alkali-earth metal, acting as heterogeneous catalyst, which substantially does not dissolve in raw materials containing alpha acids or in the phase of the product representing iso-alpha-acids, under conditions of absence of dissolvent or in presence of water, carbon dioxide or organic dissolvent or their mixture, besides, reaction of isomerisation takes place at temperature in the range between 293 and 383 K, molar ratio of alpha acid to alkali-earth metal is in the range between 0.1 and 40, the surface area of heterogeneous catalyst on the basis of alkali earth metal makes at least 10 m²/g, besides, upon completion of isomerisation reaction the method provides for separation of heterogeneous catalyst from produced product, representing iso-alpha-acids, which is performed by separation of liquid and solid phases.

EFFECT: invention relates to improved method of isomerisation of hop alpha-acids.

11 cl, 17 tbl, 18 ex