Alkylation of Isobutane with C-4 Olefins under Conventional and Supercritical Conditionsстатья
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Дата последнего поиска статьи во внешних источниках: 29 ноября 2015 г.
Аннотация:The solid acid alkylation of isobutane with butylenes on the ultrastable zeolite Y is studied in the temperature range from 120 to 150 degrees C and in a pressure range of 20 120 atm. The catalyst service life becomes longer on passing from the conventional (liquid- and gas-phase) conditions of alkylation to supercritical conditions. The maximum period of complete butylene conversion at 150 degrees C and 120 atm is 3.5 h. The composition of the reaction products is determined by the phase state of the reaction mixture, the reaction time, and the conversion of the C-4 olefins. When the alkylation is carried out under supercritical conditions, the C-8 hydrocarbon selectivity varies between 30 and 40%. Thermoanalytical data suggest that the surface of the spent catalyst contains carbon deposits indicating the formation of oligomeric and cyclic structures.