October 2012

Special Report: Process Control and Information Systems

Optimize desulfurization of gasoline via advanced process control techniques

This case history describes the development of the inferential models used in open-loop and closed-loop applications, laboratory and analyzer update mechanisms, and APC model generation.

Yadav, V., Dube, P., Shah, H., Debnath, S., Indian Oil Corp., Ltd.

At Indian Oil Corp.’s (IOC’s) Mathura refinery, a selective desulfurization unit was commissioned to reduce the sulfur content of fluidized catalytic cracked (FCC) gasoline—a blending component for finished motor spirit (MS). The objective of this new unit was lowering the sulfur content of FCC gasoline from 500 ppmw to 100 ppmw, thus meeting Euro IV product specifications for the refinery-gasoline blending pool. However, along with desulfurization, some undesirable olefin saturation reactions occurred, resulting in octane losses for the product gasoline. As per design, the octane loss in the desulfurization reactors is 1.3 units. With Euro IV specifications in place, the oc

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