Research octane number reforming

Figure 5.5 Comparison of activities of alumina-supported platinum-iridium and platinum-rhenium catalysts for the reforming of a 70-190°C boiling range Persian Gulf naphtha at 490°C and 28.2 atm to produce 98 research octane number reformate (33). (Reprinted with permission from Elsevier Scientific Publishing Company.)...

In Figures 5.7 and 5.8, data are presented for the reforming of a 65-150°C boiling range Persian Gulf naphtha at a temperature of 488°C to produce 96 research octane number reformate (33). The pressure was 28.2 atm, except for a period at 35.0 atm in the approximate time interval from hour 1460 to hour 1710 in each run. The naphtha had a density of 0.7243 g/cm3 and contained, on a liquid volume percentage basis, 70.2% alkanes, 21.1% cycloalkanes, and 8.6% aromatic hydrocarbons. 

Reforming at 28.2 atm and 490°C to produce 98 research octane number reformate. The yields are averages for 1600 hours on stream. 

As a complementary process to reforming, isomerization converts normal paraffins to iso-paraffins, either to prepare streams for other conversions nCi —> /C4 destined for alkylation or to increase the motor and research octane numbers of iight components in the gasoiine pooi, i.e., the C5 or Cs-Ce fractions from primary distillation of the crude, or light gasoline from conversion processes, having low octane numbers. 

The effects of pressure when reforming paraffinic and naphthenic naphthas at 100 research octane number are given in Table X. The lower pressure gives a higher incremental gasoline yield with the more... 

Fig. 7.3. Development of Research Octane Number of two grades of gasoline in Germany, with the technologies responsible for the changes. The octane quality of the original unprocessed hydrocarbon (S.R. tops) was improved and augmented by material from cracking and reforming processes, from tetra-alkyl lead addition and by alcohols which were used at times of crisis because they could be produced from internal resources.

The data show the research octane number of the C5+ liquid reformate... 

In Figure 5.4, the temperature required to produce 100 research clear octane number reformate is shown as a function of time on stream in the reforming of a 99-17VC boiling range naphtha containing approximately 43, 45, and 12% by volume, respectively, of cycloalkanes, alkanes, and aromatic... 

In Figures 5.5 and 5.6, data on the platinum-iridium and platinum-rhenium catalysts are shown for the reforming of a 70-190 C boiling range Persian Gulf naphtha to produce 98 research octane number product at a pressure of 28.2 atm and a temperature of 490 C (33). The naphtha contained (on a liquid volume percentage basis) 69.7% alkanes, 18.5% cycloalkanes, and 11.8% aromatic hydrocarbons. The density of the naphtha was 0.7414 g/cm3. The data in Figure 5.5 show that the platinum-iridium catalyst is almost twice as active as the platinum-rhenium catalyst. 

Figure 20 Modifications (through the variation of operational parameters) of the Research Octane Number (RON) of the reformate as a function of the amount of carbon./...

In petroleum refor.ming a metal such as Pt (or Pt / Re) supported on a silica-Alumina or a zeolite catalyst is employed for effecting the hydrocarbon conversions(l-5). The idea is to improve the Research Octane Number (RON) or the Motor Octane Number (MON) of the final reformate. The metal function catalyses several dehydrogenation, dehydrocyclization, aromatization reactions, whereas the acid function effects the skeletal isomerization, mainly through a carbocation mechanism(2-5). 

Catalytic reforming produces a product that fulfills these requirements and produces, with good yields, high octane gasoline (reformates) with research octane numbers in the order of 100. 

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