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Download e-book for kindle: Distillation Troubleshooting by Henry Z. Kister

By Henry Z. Kister

This booklet transforms a long time of hands-on studies right into a convenient reference for pros and scholars keen on the operation, layout, examine, development, and administration of large-scale distillation

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5%. It should have been (and was in previous runs) 200 ppm. Investigation The feed was analyzed by GC per normal procedure. The concentration levels of different components looked good. No significant deviation was found. Then some changes in the distillation were performed, such as • increasing the "lights fraction" in the batch distillation, • increasing the reflux ratio during the lights fraction, and • decreasing the vapor load during the lights fraction. These changes yielded no significant improvement.

Simulation prediction (both vendor and general options) predicted a much higher capacity. Tower Β This was a chemical tower equipped with random packing with a packing factor of 18. 67 in. KbO/ft packing. 87 from Equation 1. The measurement was slightly lower than the prediction because the vapor load varied through the packings, so much of the bed operated at lower pressure drop. Simulation prediction (both vendor and general options) predicted a much higher capacity. 14, the plant initially theorized that the shortfall in capacity was due to vapor maldistribution.

The last several assay points are often poor, particularly when coming from laboratories that cut back on quality control for increased productivity. Crude oils have very high boiling point material. Even light crude oils have material boiling above 1500°F. Extrapolation should be done with percent distilled on a probability-type scale, particularly for light crudes where the slope increases very rapidly on a linear scale. Solution A new boiling point curve was developed. Another assay was used up to 1000°F cut point, thus reducing the needed extrapolation range.

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Distillation Troubleshooting by Henry Z. Kister

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