METHOD OF OBTAINING ISOPRENE Russian patent published in 2015 - IPC C07C11/18 C07C1/20 C07C2/86 B01J23/85 B01J23/887 

FIELD: chemistry.

SUBSTANCE: isoprene is obtained by liquid-phase interaction of formaldehyde and isobutylene and/or substances, which represent their sources, for instance 4,4-dimethyldioxane-1,3 and trimethyl carbinol, at higher temperature and pressure in presence of water solution of inorganic acid and metal cations as catalyst, with distillation of reaction products and water from reaction zone and further isoprene separation, with carrying out isoprene synthesis in presence of catalyst, which includes mixture of either ortho- and pyrophosphoric acids, or ortho- and poly-phosphoric acids, or ortho- and metaphosphoric acids and cations of metals of VI, VIII and X group of Mendeleev′s Periodic table of elements, content of which constitutes 0.5-6.0 g/l.

EFFECT: method makes it possible to realise process with higher productivity.

3 cl, 1 tbl, 9 ex