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Refiner dramatically improves diesel yield by converting to MIDW™ technology

Challenge - Improve diesel yield and quality. A US refiner was using a competitor’s cracking-based dewaxing catalyst in a 3 kbd Diesel Hydrotreating Unit (HDT) to process a local crude that can be fairly sweet but contains a high N-paraffin content in distillate. The diesel yield ranged from 20 to 40 percent based on a cloud point reduction target ranging from 20 to 60°F using cracking dewaxing technology. Respectively, outside of the poor cold flow properties, paraffins provide high octane, low density and low T90.

The major challenge with paraffin-containing distillate feeds and conventional cracking dewaxing technologies is the over-cracking of diesel to less valuable products: LPG and Naphtha. By contrast, isomerization of the paraffin produces a high diesel yield and the isomerized paraffin has a very high diesel quality.

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