Regeneration of hydrogen fluoride alkylation catalyst

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

1994-02-24

1996-08-20

Pal, Asok

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

585723, 585730, B01J 2034

Patent

active

055479090

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 include 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.

REFERENCES:
patent: 2551881 (1951-05-01), Hachmuth
patent: 2914590 (1959-11-01), Van Pool
patent: 3721720 (1973-03-01), Chapman et al.
patent: 3793394 (1974-02-01), Chapman
patent: 3975164 (1976-08-01), Brown, Jr.
patent: 4199409 (1980-04-01), Skraba
patent: 4454369 (1984-06-01), Hutson, Jr. et al.
patent: 4663026 (1987-05-01), Louie et al.
Perry et al. "Chemical Engineers' Handbook", Fifth Edition, 1973, pp. 18-3 to 18-5.

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