PRODUCTION OF PETROL THROUGH POLYMERISATION OF OLEFIN WITH ALKYLATION OF AROMATIC COMPOUNDS Russian patent published in 2011 - IPC C07C2/66 C10G50/00 C10G35/09 C10L1/06 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of obtaining a product with the boiling range corresponding to a gasoline fraction from a stream of material from a mixture of light olefins containing ethylene, propylene and butene, and a stream of liquid aromatic material containing monocyclic aromatic compounds which contain 5-60 wt % benzene, involving: (i) separation of the stream of material from the mixture of light olefins to obtain two streams of material; (ii) reaction one of the said two streams of material in liquid phase at temperature 90-250°C and excess pressure not higher than 7000 kPa, in a fixed catalyst bed for condensation of olefins, which contains MWW zeolite as the active component, to obtain a polymer product with boiling range which corresponds to a gasoline fraction, through polymerisation of olefins in the stream; (iii) extraction of olefins from the other of the two streams of material from the mixture of light olefins through counterflow contact between the stream of olefin material and a stream of aromatic material to dissolve olefins in the stream of liquid aromatic material and formation of a stream of aromatic compounds rich in propylene and butene, and an olefin output stream containing ethylene; (iv) passing the stream of aromatic compounds containing extracted propylene and butene to the liquid-phase alkylation step on which the aromatic compounds are alkylated with extracted olefins in liquid phase at temperature 90-250°C on a solid fixed bed catalyst based on molecular sieves, which contains MWW zeolite, to form a first output stream containing alkylaromatic compounds with boiling range corresponding to the gasoline fraction; (v) passing the olefin output stream containing ethylene with the output stream from the liquid-phase alkylation step to the alkylation step on which the stream of aromatic compounds is kept in the vapour phase, on an alkylation catalyst which contains ZSM-5 zeolite, at temperature 200-325°C to obtain a second output stream containing alkylaromatic compounds with boiling range corresponding to the gasoline fraction; (vi) merging the polymer product with boiling range corresponding to the gasoline fraction with the second output stream which contains alkylaromatic compounds to obtain a product with boiling range corresponding to the gasoline fraction.

EFFECT: present invention enables to use light olefins which are processing products from a catalytic cracking apparatus in a fluidised bed for use in production of petrol.

6 cl, 5 tbl, 4 dwg