September 2007

Special Report: Refining Developments

Update: Additives improve green-diesel performance

Lessons learned from past winter season provide innovative solutions for ultra-low-sulfur diesel

Taracha, J., The Lubrizol Corp.

In October 2007, one year will have passed since the full-scale introduction of ultra-low-sulfur diesel (ULSD) fuel for onroad diesel engines in most of North America. ULSD, which can contain a maximum of 15-ppm sulfur (S), is required to protect the advanced-emissions systems of the newest (2007) diesel engines. However, due to its reduced S content, ULSD has some inherent limitations. And not all ULSD is the same. Each refinery uses a different processing configuration. In particular, ULSD's physical and performance properties also depend on the crude oil processed and the refining processes used to develop the diesel blendstocks. Good news. The unique composition of ULSD fuels provides

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