Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

PP-IV-19SELECTION OF FAVOURABLE FEED COMPOSITION OF LIGHTNAPHTHA ISOMERIZATIONSzoboszlai Zs.*, Hancsók J.*, Kalló D.**, Holló A.****University of Pannonia, Department of Hydrocarbon and Coal Processing,H-8201 Veszprém, P.O. Box 158, Hungary,Phone: +36-88-624413; e-mail: hancsokj@almos.uni-pannon.hu**Chemical Research Center, Institute of Chemistry, Hungarian Academy of Sciences,H-1515 Budapest, P.O. Box 17, Hungary***MOL Hungarian Oil&Gas Plc. H-2443 Százhalombatta, P.O. Box 1.Several national and international organisations are making efforts to decrease harmfuleffect of expanding traffic [1-3]. In the production of environmentally friendly and humanbiologically favourable blending components of engine gasoline’s isoparaffin fractions havinglow carbon number (C 5 -C 7 ) are indispensable. They have low sulfur content and they are freefrom aromatics and olefins; besides, they have high octane number of low sensitivity andcomprises of clean burning compounds [1-3]. Hence, the demand for isoparaffin fractions isincreasing constantly [3]. The isomerization of light naphtha has the potential to satisfy thesequality and quantity requirements. Therefore, isoparaffins and naphthenes are the mostfavourable gasoline blending components among the groups of hydrocarbon compounds.Availability of naphthenes is strongly limited in gasolines. Their amount depends on theorigin of crude oils and can not be increased. In fact, naphthenes – present in gasolinefractions of low octane number – can not be separated economically from other hydrocarbonsbecause of their close boiling points. Therefore, isomerization of light n-paraffin fractions(C 5 -C 7 ) is needed, so the objective of the research work was to investigate catalysts that areapplicable for the isomerization of selected light naphtha fractions having differentcycloparaffin concentrations. The influence of different feeds on the product composition wasalso investigated [3-6].The investigated Pt/SO 2– 4 /MO x catalyst, and new generation Pt/H-MOR have different n-hexane isomerizing activity depending on process temperature. n-Hexane fractions of variouscycloparaffin content (0.0-15.0 % – Its amount depends on the origin and type of crude oilsand separation system.) were used as feeds. Hydrocarbon composition, water and totalsulphur content of the feeds and products were determined by standard test methods. Theinvestigation of isomerization over the two different catalysts was carried out at differentprocess conditions. Octane numbers of the products are high, compared to those of the feeds.The increase of octane number was very significant, approximately 25-40 units (liquidproduct-feed). This is the result of the underneath mentioned effects:430