METHOD OF PRODUCING ISOPRENE, ISOBUTYLENE AND FORMALDEHYDE Russian patent published in 2011 - IPC C07C1/20 B01J19/32 C07C11/18 C07C11/09 C07C47/04 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of decomposing high-boiling by-products of production of isoprene from isobutylene and formaldehyde by mixing high-boiling by-products with superheated water vapour and contact with a catalyst in one or two deck-type reactors while heating to obtain isoprene, formaldehyde and isobutylene, characterised by that liquid high-boiling by-products are first evaporated and superheated to temperature 300-350°C together with water vapour in ratio 1:1.0-1.2 in the convection part of a vapour-superheating furnace in a system of straight pipes fitted with a self-contained collector, and then mixed in a mixer with superheated water vapour to weight ratio 1:3.0-4.0, and then fed at 400-450°C into a reactor, in the over-catalyst zone of which there is a clearing-distribution grid with common clear area of 15%, having 20 mm holes and caps with diameter of 100 mm and height of 80 mm.

EFFECT: use of the present method enables to loser specific consumption of water vapour when splitting high-boiling by-products with simultaneous increase in output of desired products.

2 cl, 3 ex, 1 dwg