CONTINUOUS METHOD FOR SELECTIVE CONVERSION OF OXYGENATE TO PROPYLENE USING MOVING BED TECHNIQUE AND HYDROTHERMALLY STABILISED BIFUNCTIONAL CATALYST SYSTEM Russian patent published in 2011 - IPC C07C1/00 C07C11/06 

FIELD: chemistry.

SUBSTANCE: in the method for selective conversion of oxygenate material to propylene, the oxygenate used is oxygen-substituted aliphatic hydrocarbons, having at least one oxygen atom and 1-10 carbon atoms, and involves the following steps: a) reaction of oxygenate material and diluent in amount of 0.1-5 mole diluent per mole of oxygenate with particles of a bifunctional hydrothermally stabilised catalyst, containing a molecular sieve, which can convert at least a portion of oxygenate to C₃-olefin and cause interconversion of C₂- and C₄₊- olefins to C₃-olefin,and dispersed in a phosphorus-containing alumina matrix which contains labile anions of phosphorus and aluminium, in a reaction zone in which there is at least one reactor with a moving bed, where the reaction zone works in oxygenate conversion conditions at temperature ranging from 350°C to 600°C, pressure ranging from 10.1 kPa to 10.1 MPa and weighted hourly space velocity from 0.1 to 100 h^-1,which enable conversion of oxygenate to propylene at a catalyst circulation rate through the reaction zone selected such that, the period of the working cycle of the catalyst is 400 hours or less, as a result of which an output stream is obtained, which predominantly contains C₃-olefin product and by-product water is formed, as well as C₂-olefin, C₄₊-olefins, C₁-C₄₊-saturated hydrocarbons in less amounts and small amounts of unreacted oxygenate, oxygenate by-products, highly-unsaturated hydrocarbons and aromatic hydrocarbons; b) feeding the output stream into the zone with subsequent cooling and division in that zone of the output stream into a vapour fraction rich in C₃-olefin, a water fraction containing unreacted oxygenate and oxygenate by-products, and a liquid hydrocarbon fraction containing heavier olefins, heavier saturated hydrocarbons and small amounts of highly-unsaturated hydrocarbons and aromatic hydrocarbons; c) recirculation of at least a portion of the water fraction obtained at step b) to step a) to provide at least a portion of the diluent used there;d) division of the vapour fraction into a C₂-olefin rich fraction, C₃-olefin rich target fraction and a first C₄₊-olefin rich fraction; e) recirculation of at least a portion of olefins contained in the C₂-olefin rich fraction or the first C₄₊-olefin rich fraction or a mixture of these fractions to step a) and f) removing coke-containing particles of the catalyst from the reaction zone, oxidative regeneration of the removed catalyst particles in the regeneration zone and returning the stream of particles of the regenerated catalyst to the reaction zone.

EFFECT: improved method.

11 cl, 1 dwg