Exxonmobil Research and Engineering Company

Tian Chong Lau

James M Brown

Francis X Kelly

A method for controlling the manufacture and certification of an oxygenated gasoline product is carried out by manufacturing a gasoline Basestock for Oxygenate Blending (BOB) at a refinery site in accordance with an empirical relationship, valid for at that site under typical manufacturing conditions, between (i) a property value of the BOB stream such as octane as determined by an on-site online process analyzer and (ii) the corresponding instantaneous value or FPAPV property value as determined by the test method mandated by the product specification for the final gasoline stream when blended with the required proportion of oxygenate. The quality of fit of this empirical relationship is calculated according to the standard deviation of the residuals of the relationship and a confidence level is fixed so that the final oxygenated gasoline formulated with the BOB will meet the required property specification when measured by the test method mandated by the specification. The final oxygenated gasoline blend is certified as having a property value conforming to the required specification based on the predicted property value for the finished gasoline.

Quality certification of oxygenated gasoline

The present invention uses the one or more on-line process analyzers that monitor the manufacture of petroleum products, such as gasoline or diesel fuel, to analyze and/or certify that the manufactured product meets regulatory and/or contractual requirements. The analysis is performed by re-introducing a manually or automatically collected sample that is representative of the manufactured product back into the one or more process analyzers. The results obtained for the representative sample from the on-line process analyzers are then used to represent the quality of the manufactured batch of petroleum material to certify that the manufactured batch meets regulatory, specification and/or contractual requirements.

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Tian Chong Lau