Optimization of the propylene content in the propane-propylene fraction fed to benzene alkylation in order to obtain isopropylbenzene

One of the critical units for isopropylbenzene production plants is unit preparation reactant fractions, in particular, used propane-propylene fraction. In accordance with Specifications TU 0272-024-00151638-99, content propylene this fraction must be at least 65% wt. Such a sufficiently low to carry out reaction benzene alkylation leads inefficient use volume reactor. The operation concentration from industrial by considered. study carried using Honeywell UniSim Design modeling system. flow process one distillation column and when two columns simulated. A computational experiment has shown that order obtain (calculated 99.1% wt.) propane (estimated 90% - 4.47% fractions meet parameters current regulatory documents, it possible technological modes: Тlow=31.4 ℃, Тup=21.17 apparatus pressure 1050kPa, reflux ratio R=13.43. When columns, first qualitatively "forms" wt., 0.8% wt.), second practical absence (propane 94.42% 0.03% wt.). developed models schemes can evaluate operating design analyze achieved indicators. Calculations show site, probable cause high resulting about 7% maintenance non-optimal regimes. Values expedient are given.