Optimization of technological regimes of the deisopentanizer column for the preparation of the feed stream of the low-temperature isomerization unit PGI-DIG/280-NK

Raw fractions used in isomerization plants contain isopentane, which is the target product, and its presence feed as “ballast” occupies useful volume of reactor. To optimize composition processed raw materials, a number enterprises have included deisopentanizer column technological scheme. The paper evaluates possibility optimizing regimes design parameters for low-temperature unit that does not scheme extracting isopentane from feedstock. studies were carried out using Honeywell UniSim Design modeling system. properties fraction components calculated Peng-Robinson method. Calculations made two types materials containing 8.7÷19.7% wt. isopentane. performed calculations established order to achieve almost complete recovery stream hydrotreating section, distillation should 63 theoretical plates, minimum reflux ratio be Rmin = 12.3. At same time, normal pentane distillate will exceed 0.07% wt., bottom content also operation simulated, 80 plates (the efficiency contact device 0.8), plate 33. feedstock consumption 62550 kg/h, temperature 40°C pressure 294.2 kPa. convergence iterative processes by environment was obtained active specifications: cube 0.0007wt. share share. modes provide extraction material, namely 99.37÷99.7%, while industrial conditions it essential implement profile along height column. with diameter exhaustive strengthening parts shown.