FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing isoprene through liquid-phase reaction of tert-butyl alcohol, 4-methyl-5,6-dihydropyran and 4,4-dimethyl-1,3-dioxane with aqueous formaldehyde solution in the presence of a solid acid catalyst and molar excess of tert-butyl alcohol with respect to formaldehyde with continuous outlet of the formed products and subsequent separation thereof. The method is characterised by that synthesis is carried out in a single reaction zone in a homogeneous phase at temperature 120-150°C and pressure 12-15 atm.
EFFECT: use of the present method simplifies the process, optimises characteristics of the process: selectivity and output of isoprene and by-products, eliminates the energy-consuming step for recuperation of formaldehyde.
4 cl, 11 ex, 1 tbl, 3 dwg
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