Diesel paraffin/aromatic content

Identifying the paraffin, olefin, naphthene, and aromatic content of fuel good for gasoline not as accurate for jet, diesel, and other mid-distillates... 

The cracking and hydrogenation balance in the catalyst depends on acid center/metal ratio. In our case, the main target is the diesel quality. The results of diesel PNA analysis are shown in Table 6 for catalysts Cl, CII and CIII operating at 380 °C. The analysis shows that the steam-ammonia treatment increases the paraffins content and decreases naphthenes and aromatics content. This indicates a higher hydrogenation-hydrogenolisis activity in CIII than in CII and Cl. In addition, the NMR analysis indicates... 

Emission standards for diesel vehicles have tightened or are expected to tighten considerably in many countries and regions. These standards have resulted in emission or content limits on sulfur, particulates, aromatics, and nitrogen oxides. Synthetic ultra-clean transportation fuels are virtually free of sulfur and are primarily paraffinic. Therefore, they are considered a potentially... 

From a thermodynamic point of view [145] the manufacture of synthetic transportation fuels should aim at a minimum change of the hydrogen content of the feedstock to that of the product (typically around H/C=2). It means that, in principle, it is more efficient to convert natural gas to paraffinic diesel than to aromatic rich gasoline. For coal the indirect conversion via syngas appears less efficient than the direct hydrogenation routes. However, these theoretical considerations should be supplemented with an analysis of the process steps and selectivities involved [145]. 

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