Oxidative desulfurization offers route to ultralow-sulfur diesel

Heightened concerns for cleaner air are leading to more stringent regulations on sulfur content in transportation fuels. That in turn is making desulfurization in hydrocarbon processing more important.Here's the first formation (left photo) of the emulsion mixture (Fig. 1). The lower layer opaque emulsion (right photo) formed a white milk-like layer once the mixture temperature reached 70°C. (Fig. 2).The result has placed pressure not only on refiners but also on governments and legislatures. The sulfur problem is becoming more serious in general, particularly for diesel fuels, as the regulated sulfur threshold in the next few years is already aimed at virtually sulfur-free liquid.Alt...

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