METHOD FOR PROCESSING BY-PRODUCTS OF SYNTHESIS OF 4,4-DIMETHYL-1,3-DIOXANE Russian patent published in 2020 - IPC C07C11/18 

Abstract RU 2712964 C1

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of processing by-products of synthesis of 4,4-dimethyl-1,3-dioxane formed from isobutylene and formaldehyde and / or substances which are sources thereof, when decomposed on an aluminosilicate catalyst in the presence of water vapor at temperature of 400–480 °C. Method is characterized by that before decomposition, by-products of synthesis step of 4,4-dimethyl-1,3-dioxane are mixed with demineralized water and aqueous layer of condensate of reaction mass of liquid phase synthesis of isoprene in ratio of HBP : demineralized water : aqueous layer of condensate of reaction mass of liquid-phase isoprene synthesis equal to 1:(0.1–0.28):(0.01–0.06) respectively, obtained mixture is hydrolyzed at temperature of 100–155 °C and pressure from atmospheric to 1.0 MPa with subsequent evaporation of obtained hydrolyzate in water vapor flow at temperature of 190–250 °C and pressure of 0.2–1.0 MPa, formed gas is fed for catalytic decomposition.

EFFECT: increase of total output of useful products, reduction of coke content, increase of heavy residue conversion.

1 cl, 2 ex

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Authors

Dates

2020-02-03Published

2019-07-24Filed