Regeneration of hydrogen fluoride alkylation catalyst

Details Regeneration of hydrogen fluoride alkylation catalyst Regeneration of hydrogen fluoride alkylation catalyst

1994-08-30

1996-06-18

Pal, Asok

Chemistry of hydrocarbon compounds

Saturated compound synthesis

By condensation of a paraffin molecule with an olefin-acting...

585723, C07C 262, C07C 704

Patent

active

055279805

ABSTRACT:
An improved process for the regeneration of an ASO-containing HF catalyst by the removal of ASO from said catalyst through the utilization of a separation column equipped with fixed valve fractionation trays. The separation column defines a separation zone having a top zone, an intermediate zone, and a bottom zone wherein contained within the bottom zone is a series of vertically spaced, fixed valve fractionation trays, wherein each of the fixed valve fractionation trays includes a plate defining a plurality of apertures and wherein fixedly spaced above each of the apertures is a valve having a shape substantially the same as the apertures for directing the flow of gas passing upwardly through the apertures of the plate into the direction substantially parallel to the plate. One important aspect of the invention includes the use of the fixed valve fractionation trays in combination with the recycling of the bottoms stream in order to minimize the amount of hydrogen fluoride that passes with the ASO of the bottoms stream of the separation column. Further embodiments of the process include the formation and provision of multiple liquid phases in the bottom zone of the separation column with the liquid phases each having a different concentration of HF. The liquid phase with the lowest HF concentration is withdrawn as a product and the liquid phase with the larger HF concentration is recycled to the intermediate zone of the separation column.

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Perry et al. "Chemical Engineers' Handbook". Fifth Edition, 1973 pp. 18-3 to 18-5.

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