METHOD OF OBTAINING ISOPRENE Russian patent published in 2015 - IPC C07C11/18 C07C1/20 C07C2/86 B01J23/652 

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. Isoprene synthesis is carried out in presence of catalyst, which includes mixture of ortho- and pyrophosphoric acids, or ortho- and poly-phosphoric acids, or ortho- and metaphosphoric acids and cations of metals of VI and X group of Mendeleev′s Periodic table of elements, with weight ratio mixture of inorganic acids, counted per orthophosphoric acid:cations of metals of VI group:cations of metals of X group equal 1:(0.01-0.5):(0.003-0.04) respectively.

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

3 cl, 8 ex, 1 tbl