Increasing the variability of the manufactured commercial products of the catalytic reforming plant

The stable reformat of catalytic reforming plants, in particular CCR plants, contains a large amount (up to 77% by weight). aromatic hydrocarbons, of which one third are xylenes. In industrial installations, when producing commercial gasoline, a situation arises when the octane index exceeds the required value. In this regard, it is possible to isolate the flow of total xylenes from a stable reformat, which will increase the variability of manufactured commercial products and bring the octane index to a normative value. The study of possible variants of the scheme for the separation of xylenes from a stable reformat to increase the variability of manufactured marketable products is carried out. To assess the achieved indicators of possible technological schemes for the separation of xylene fraction from a stable reformat, the following options were considered: a complex column with lateral selection of xylene fraction, a complex column with a stripping section and a scheme of two sequentially connected distillation columns. The study was performed using the UniSim Design modeling system. A two-column technological scheme of the secondary rectification unit of a stable reformat is proposed, which ensures that the content of the xylene fraction in the commercial product exceeds 97% by weight. with 84% selection of xylenes from their content in the feed stream of the proposed technological scheme. The number of valve plates is 50 for the first column and 70 for the second, Taking into account the cost of design and survey work, the supply of material and technical resources, as well as the cost of construction and installation work, the payback period of the proposed project will be 3.5 years.