The purchase of benzene credits to offset benzene levels in gasoline in excess of 0.62 vol.% is an expensive method to compensate for suboptimal control of the reformer feed. To minimize the formation of benzene, Naphtha Splitters are utilized for optimal fractionation between Benzene and Heptane (i.e. C7’s).
Optimal fractionation in the Naphtha Splitter requires qualitative analysis of Benzene in the reformer feed and C7’s in the isomerization feed. Located before the Reformer, the tec5USA Raman Online Raman Analyzer and Tidus XP Probe identifies benzene content in heavy Naphtha before sending the feed to the Reformer. Measurement before the Isomerization feed allows for the quantitative measurement of molecules with 7 carbon atoms or greater. Monitoring the reformer and isomerization feed enables immediate optimalization of the reboiler and reflux duties via closed-loop control.
Online Raman Analyzer
Traditional methods for monitoring key parameters within the refinery, and more specifically within the Naphtha Splitter, include differential pressure, differential temperature, laboratory analysis and online Gas Chromatography (GC). These techniques introduce drawbacks such as inaccuracy, significant lag-time, and high maintenance. In contrast to these methods, Raman Spectroscopy, with the tec5USA Raman Analyzer, is a cost-effective, immediate, and accurate method for optimizing the performance of the Naphtha Splitter and improving the fractionation of Benzene and Heptane (C7’s), by providing immediate and accurate chemical analysis at the point of insertion.
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