REACTOR FOR LIQUID-PHASE SYNTHESIS OF ISOPRENE Russian patent published in 2013 - IPC C07C11/18 C07C1/20 C07C2/86 B01J10/00 B01J14/00 

FIELD: chemistry.

SUBSTANCE: invention relates to apparatus for liquid-phase synthesis of isoprene from material which contains isobutylene and formaldehyde and/or substances which are sources thereof, for example, trimethyl carbinol and 4,4-dimethyl-1,3-dioxane, in the presence of an aqueous solution of an acid catalyst. The apparatus is a reactor system consisting of a shell-and-tube reactor which is heated by steam through the inter-tube space and is connected in series to a hollow vertical reactor, possibly fitted with a pump for forced circulation of the reaction mass between reactors, wherein there are distribution devices in the reactors for feeding material. The apparatus is also characterised by that it has at least three reaction zones defined by points of feeding material. In the hollow reactor, there are distribution devices for the entire stream of reaction mass above the points of feeding material, wherein the distance between a point of feeding material and a distribution device of the entire stream is at least 0.1 m, preferably 0.5-2.0 m.

EFFECT: use of the present apparatus enables more flexible control of the process of synthesis of isoprene with reduced formation of by-products and also increases efficiency of using the reaction volume, thus reducing capital and operating costs.

5 cl, 1 dwg