Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

PP-III-2Initial conditions: С i (0)= С i,0 ; T(0)= T en ,where С i – i-component concentration [mol/м 3 ]; Т – temperature, °К; ρ - mixture density,[kg/м 3 ]; Ср – mixture heat capacity, [кJ/mol*К]; ΔH j – j-hydrocarbon enthalpy, [кJ/mol];W j – j-hydrocarbon reaction rate.During the investigations the inverse kinetic problem was solved and rate constants ofmain reactions going in pentane-hexane fraction isomerization process were obtained. Forcalculations we used experimental data from L-35-11/300 unit of «Kirishinefteorgsintez» Ltd.The program realization of the model was done in integrated environment Delphi 7.ИОЧ82Зависимость ИОЧ от состава сырья9281,89081,68881,4ИОЧ86ИОЧ81,284818280,880120 130 140 150 160 17080,611.08.2006 31.08.2006 20.09.2006 10.10.2006 30.10.2006 19.11.2006 09.12.2006 29.12.2006 18.01.2007темпера тура, °Ссреднее ИОЧдатаFigure 1 – The octane number dependence on rawmaterial compositionFigure 2 – The octane number dependence on processtemperatureThe influence of raw material composition on octane number was examined with constanttechnological parameters. The change of octane number has chaotic character within quitelarge interval of 1.0-1.5 points (figure 1) while all other parameters are constant. Elaboratedcomputer modeling system allows to detect raw material composition influence onisomerizate octane number.Temperature increase provides obtaining of isomerizate with higher octane number. Atthe same time it leads to decrease of catalyst service cycle because of coking reaction rateincreasing, also the fraction of side hydrocracking reactions increases. The obtained resultsagree with theoretical ideas. Moreover temperature selection allows to change the isomerizateoctane number in a wide range.Using mathematical modeling method it is possible to find the optimal conditions ofprocess running, to calculate and to design reactor blocks for isomerization process.306