| At present, only 1-2 components of the reformate raffinate oil were separated by ordinary distillation and azeotropic distillation by most domestic manufacturers, however, reformate raffinate oil contains pentane, isohexane, n-hexane, n-heptane, cyclopentane, methylcyclopentane and other high value components. The production of reformate raffinate oil in Lanzhou petrochemical refinery factory is about 120000 tons/year, however, just one component,70% purity of Industrial Hexane, was separated, and its production was only 8000 tons/year by Additives factory. The main components are not deep separated and just as topped composition to ethylene plant, the economic benefits are not complete expression.According to the production status of Lanzhou Petrochemical reformate raffinate oil, raffinate oil detailed separation process was studied in the laboratory. The experimental on raffinate oil of specific composition are analyzed in detail, the raffinate oil content of olefin about 3%, the content of benzene about 0.01%, n-hexane about 10%, isohexane 10-20%, n-heptane 5-7%, the remains was 120# solvent oil and heavy consitituent. The hydrogenation experiments was done with a fixed bed microreactor, The effects of space velocity, hydrogen flux, temperature and pressure on the hydrogenation reaction were studied, the optimal reaction temperature of 150℃, and the pressure is 1.0 Mpa were obtained. hydrogenation oil no longer contains the olefin and benzene of C6-C7.The separation experiments of hydrogenated fractions were carried out with efficient distillation towers, and several products were obtained, such as industrial isohexane, high purity isohexane, industrial n-hexane, high purity n-hexane,120# solvent oil, n-heptane and C8-C9 residual heavy consitituent and Aromatics. The effects of temperature, reflux ratio, plate number and other effects on the product composition were studied, and the optimal parameters were obtained for distillation process. |
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