OP-II-3

PP-I-16DEVELOPMENT OF MODELING SYSTEM FOR CALCULATIONOF STAGES OF LINEAR ALKYLBENZENES PRODUCING BASEDON RECYCLING RAWDolganov I.M., Kirgina M.V., Ivashkina E.N.Tomsk Polytechnic University,Lenin av. 30, Tomsk, Russia, 8(3822)563443, dolganovim@sibmail.comCurrently, the world has substantially increased the need for various detergents,so production of the main component of synthetic detergents (SD) –alkylbenzosulphonate and linear alkyl benzene (LAB and LABS) will grow also.Alkylbenzosulphonate are anionic surfactants and have good cleaning ability,allowing them to hold the leading position among other detergents. Thus, there is anobvious need to increase the production of LAB [1].The aim of work is the creation of a unified computer system simulating variousoptions for reconstruction of chemical-technological systems, including closed ones,containing recycling materials.Complex for LAB and LABS production includes three technology-related reactorunits: dehydrogenation of n-paraffins, dehydration of hydrogenation processby-products – diolefines - to monoolefines, and alkylation. In the process ofdehydrogenation of a relatively low conversion of n-paraffins – 12-13% (in fact 10%)is adopted by the project, so the alkylation unit receives a significant amount ofnormal paraffins, which, after alkylation are returned as recirculation todehydrogenation unit. But other options for recycling of unreacted paraffins (afterdehydrogenation reactor, after the hydrogenation reactor) are also possible [2].Fig. 1. Scheme ofdehydrogenation process withrecycle of unreacted paraffins:M – mixer; DR – dehydrogenationreactor; S – separatorMathematical model of recirculation:G4 G4x1i= (1 −ϕ) ⋅ x0i + ϕ⋅ x4i; x3i= (x2i −ϕ⋅x 4i)/(1 −ϕ);ϕ = = , ϕ = 0..1; (1)G G2 1Here G n – total mass flow, x ni – mass fraction, %, n – flow number, n = 0...4;i – component number, i =1...N, N – number of components in the flow.248