Patent ID: 8999012
Filing Date: 2015-04-07
Classification: C10L,G01N,G05D

Abstract:
1. A method to control the manufacture of an oxygenated gasoline stream by: (a) establishing a relationship for a single manufacturing site used for the manufacture of an unoxygenated gasoline subgrade Basestock for Oxygenate Blending (BOB) stream under defined refining conditions used at that site, between (i) the octane number of the BOB stream as determined by an octane engine that is operationally connected to the output of a gasoline blender at the single manufacturing site and (ii) the octane number of the BOB stream when blended with the proportion of oxygenate required by a final oxygenated blend specification; (b) establishing the quality of fit of the established relationship as characterized by the standard deviation of the residuals of the established relationship; (c) establishing a manufacturing target value for the octane number of the finished oxygenated gasoline in accordance with the established relationship such that the final oxygenated gasoline formulated with the manufactured BOB will meet the octane number specification when measured by a test method mandated by the specification at a pre-defined confidence level, and (d) blending the BOB using a process analyzer that is operationally connected to the output of a gasoline blender at the single manufacturing site such that the blend recipe is controlled to meet a calculated instantaneous value or FPAPV for the final oxygenated gasoline octane number matching the established target, based on the relationship established between the BOB and the finished oxygenated gasoline octane number.