FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing isoprene by reacting components of a raw material containing formaldehyde, isobutylene, isobutylene derivatives and isoprene precursors in the presence of a solid-phase acid catalyst which contains niobium phosphate, followed by separation of the end product. The method is characterised by that reaction of formaldehyde with isobutylene, isobutylene derivatives and isoprene precursors is carried out in molar ratio of isobutylene and derivatives thereof to formaldehyde of (3.5-8):1, molar ratio of isobutylene derivatives to isobutylene of (0.75-3.5):1, molar ratio of formaldehyde to isoprene precursors of (4-10):1, the raw material is fed into the reactor at temperature of 140-160°C and pressure of 13-17 atm in form of a continuous gas-liquid stream with volume rate of the gas phase of 20-250 h-1 and of the liquid phase of 10-25 h-1.
EFFECT: use of the present method increases isoprene output and reduces output of high-boiling by-products.
3 cl, 1 dwg
