METHOD FOR DEHYDRATION ISOMERISATION OF SOURCE MIXTURE OF PRIMARY ALCOHOL SUBSTITUTED IN POSITION 2 WITH ALKYL GROUP, ON CATALYST CONTAINING ZEOLITE OF FER TYPE Russian patent published in 2019 - IPC C07C1/24 C07C11/08 C07C11/09 C07C5/27 B01J29/65 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for isomerisation of dehydration of an initial mixture containing 40 to 100 wt. % of a primary alcohol substituted in position 2 with an alkyl group selected from isobutanol, 2-methyl-1-butanol and mixtures thereof. Method includes at least the following stages: a) compressing the starting mixture and then heating the compressed initial mixture by heat exchange with a dehydrated stream from step c), in a heat exchanger to obtain a heated initial mixture; b) evaporation of the heated initial mixture by mixing with a dilution stream coming from step f), wherein the ratio of the weight flow rates of the diluting stream and the heated initial mixture is in range of 5/95 to 60/40; c) dehydration of stream coming from step b) in at least one dehydration reactor in gas phase at weighted average temperature in range from 250 to 375 °C, at pressure in range from 0.2 to 1 MPa and WHSV in range of 1 to 18 h^-1 in the presence of a catalyst containing ferrierite-type zeolite, wherein said catalyst is pre-coked in situ or ex situ, in order to obtain a dehydrated stream at the outlet; d) cooling the effluent dehydrated stream in at least three successive steps of heat exchange with at least a stream of water coming from step e), then compressing the initial mixture of step a) and then with the coolant to obtain a cooled effluent stream; e) decantation of the cooled effluent stream with separation into aqueous and organic fractions, wherein one part of the aqueous fraction is discharged in form of blow for treatment outside the dehydration method, and the other portion forming the outflow of water is recycled through step f); f) recirculating water flow coming from step e) and at least partial evaporation by heat exchange in a heat exchanger with a dehydrated stream coming from step c), separating the liquid fraction, if any, and then compressing and overheating the vapour fraction to form a dilution stream, wherein the dilution stream is recycled to step b); g) separating the organic fraction recovered at step e) in at least one distillation column to obtain an exit stream of alkenes and an effluent stream of heavy hydrocarbons.

EFFECT: use of the proposed method enables conversion of alcohols to the desired product with content of linear alkenes in the alkene fraction which is significantly higher than the value expected for thermodynamic equilibrium, with complete alcohol conversion and selectivity for common alkenes exceeding 97 %.

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