METHOD OF ISOPRENE PRODUCTION Russian patent published in 2008 - IPC C07C11/18 C07C1/20 

FIELD: chemistry.

SUBSTANCE: isoprene is obtained by liquid-phase interaction of trimethylcarbinol or its water solutions and formaldehyde or substances which are its sources, for instance 4,4-dimethyl-1,3-dioxane, in presence of water solution of acid catalyst, realised at higher temperature and pressure in one or several steps of contact, using at the last step of contact reaction-separation apparatus, which includes zone of heat supply, reaction zone and separation zone, with removal of reaction products and water from separation zone in form of vapour flow, with further cooling, condensation and separation, with output of liquid flow of water catalyst solution for extraction, with further return to heating zone, and is characterised by the following: pressure in reaction zone is supported higher than pressure of saturated water vapour, corresponding to temperature in reaction zone, and pressure in separation zone is kept lower, than pressure of saturated water vapour, corresponding to temperature in reaction zone, performing throttling of reaction flow during passage from reaction zone to separation zone.

EFFECT: carrying out process at optimal reaction conditions.

5 cl, 7 ex, 6 dwg