Enhancement in the fuels quality and contaminants withdrawal

The adoption of more modern, efficient automotive engines requires the continuous enhancement of gasoline quality. In this context, octane number is one of the key parameters for refiners, since it conveys better performance to the vehicles. The dependence on high octane cracked naphtha stocks becomes still more pronounced by the presence of progressively more stringent sulfur specifications, since most of the post-treatments designed for gasoline sulfur withdrawal inevitably also lower its octane number. 

The Fábrica Carioca de Catalisadores portfolio contains products that aid refiners in meeting the present gasoline quality requirements, as for example, the ISOZOOM, an additive enabling the enhancement of the octane number and the RESOLVE 950, an additive to lower sulfur compounds in cracked naphtha. 

Additive for enhancing gasoline octane number 

To meet the demand for gasoline higher octane number, refiners can choose as strategy the use of ZSM-5 -based zeolite additives. This zeolite low-diameter pore system only allows the inlet of linear compounds in the range of naphtha and LCO, which are cracked within the crystal, yielding high-octane-number species. 

What renders the ISOZOOM additive different from the conventional ones is its formulation and production technology, which enable a more selective reaction mechanism to isomerization relative to cracking. The prevalence of the isomerization mechanism over the olefin cracking possesses an additional advantage: whenever these molecules are hydrogenated in the HDS unit, they become branched paraffin compounds, preserving the gasoline octane number. 

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Additive for sulfur compounds reduction in the cracked naphtha 

RESOLVE 950 is an effective solution for refiners having interest in reducing sulfur compounds in the cracked naphtha and simultaneously obtain SOx emission control in the regenerator. 

For the high-hydrogen content molecules present in the light gasoline fractions the additive approach is the adsorption and direct cracking to H2S by means of a high-activity system. Sulfur compounds in the FCC gasoline medium and end range are of different nature, being hydrogen-deficient and of more aromatic nature. With the final goal of saturating a few of these compounds and impart them higher chances of being converted into H2S, a few RESOLVE 950 components have higher ability to selectively adsorb these molecules, enabling higher contact time for performing the additional hydrogen transfer. Further components of its formulation are able to alkylate thiophene compounds. Saturated, substituted thiophene compounds are significantly more reactive that thiophene itself, enabling enhanced conversion to H2S.  

The use of additives for sulfur reduction in cracked naphtha, such as the RESOLVE FCC S.A. technology may aid in up to 35% sulfur reduction in the FCCU gasoline.

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