METHOD OF PRODUCING ALKYLBENZINE Russian patent published in 2012 - IPC C07C2/58 C07C9/16 B01J8/04 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing alkylbenzine via alkylation of isobutane with olefins in a catalytic reactor at high temperature and pressure, where isobutane is fed into the top section of the reactor then successively passed through all sections with a catalyst, and olefin-containing material is distributed into several streams, the number of which is equal to the number of catalyst sections and then simultaneously fed into the section containing catalyst in parallel streams in order to conduct an alkylation reaction. A hydrocarbon stream containing unreacted isobutane and reaction products is divided into two streams: a vapour stream obtained by evaporating isobutane, which is then condensed and taken for recycling, and a liquid stream which is the reaction product coming from the reaction system or partially taken for recycling. Temperature and pressure in each reactor section is kept so as to ensure an equilibrium vapour-liquid state of the mixed hydrocarbon stream passing through the reactor. The olefins used in the method are C₂-C₄ olefins. The number of sections ranges from 2 to 10. Before entering the section containing catalyst, the olefin-containing stream is mixed with isobutane in ratio of 1:(250÷1000), and 50-99.9 wt % vapour stream from the overall stream coming out of the last reactor section is taken for recycling.

EFFECT: method enables to increase the cycle length of the catalyst and reduce power consumption.

4 cl, 8 ex, 1 tbl