Light Olefin Oligomerization

The oligomerization of propylene and butenes to gasoline range olefins is a technology which began in the 1930s with the work of Ipatieff on phosphoric acid in 

Zeolite S1O2/ AI2O3 ratio Metal (wt%) Feed Hj/HC WHSV Temperature 

SSZ-25 (MWW) 30 Pt (1.0) Hydrocracked north slope VGO, pour point 100°F (63°C) 343 °C 2150 psig Pour point 10°F, Lube yield 69% [29] 

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Mantilla, A., Ferrat, G., Lopez-Ortega, A., Romero, E., Tzompantzi, F., Torres, M., et al. (2005a). Catalytic behavior of sulfated Ti02 in light olefins oligomerization. Molecular Journal of Catalysis A Chemical, 228, 333—338. 

Furthermore, the major problem of reducing aromatics is focused around gasoline production. Catalytic reforming could decrease in capacity and severity. Catalytic cracking will have to be oriented towards light olefins production. Etherification, alkylation and oligomerization units will undergo capacity increases. 

A light diesel fuel was produced by distillate hydrotreating of the straight-run Fe-HTFT material, while the heavier fraction was hydrocracked over a dewaxing catalyst, which produced a heavy diesel (Table 18.10). Some diesel fuel was also produced by C3-C4 olefin oligomerization over solid phosphoric acid by recycling the naphtha thus produced. It has previously been pointed out that solid phosphoric acid is not well suited for distillate production,42 and the hydrogenated... 

The oligomerization of light olefins such as ethylene for the production of synthetic fuels using zeolites as catalysts has been extensively studied.[25-28] In general, it has been found that the rate of oligomerization of ethylene over ZSM-5 zeolite is slower compared with other olefins and higher reaction temperatures are necessary. The catalytic performance of this reaction is related to the nature and number of acid sites of the zeolite. 

Inui, T. and Kim, J. B. High quality gasoline synthesis by selective oligomerization of light olefins and successive hydrogenation. Stud. Surf. Sci. Catal., 1996, 100, 489 498. 

Bellusi, G., Cavani, F., Arrigoni, V. and Ghezzi, R. Process for oligomerizing light olefins. EP Patent 0463673, 1992. 

The polyaddition of light olefins (ethylene, n-opylene. butenes), gives rise to oligomeric olefins with a molecular weight that is a multiple of the starting olefin. The following can be distinguished... 

HIGH QUALITY GASOLINE SYNTHESIS BY SELECTIVE OLIGOMERIZATION OF LIGHT OLEFINS AND SUCCESSIVE HYDROGENATION... 

In the MOGD reaction, ZSM-5 oligomerizes light olefins, from either refinery streams or MTO, into higher molecular weight olefins that fall into the gasoline, distillate, and lubricant range. 

Light olefins are oligomerized in the MOGD unit to coproduce gasoline and distillate. The distillate is hydrotreated (HTD unit) to produce the final distillate product. 

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