Hydrotreating with catalyst particles using length and density grading
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United States of America Patent
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Jan 21, 1992
Issued Date -
N/A
app pub date -
Mar 12, 1990
filing date -
Mar 10, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mixture of shaped catalysts, catalyst supports or sorbents comprising generally cylindrical, free flowing particles of regular geometric shape having substantially the same diameter and of varying length are length graded into a first group of particles having a length below a predetermined length, L.sub.1, in the range of fromn 0.8 to about 24 millimeters and an L/D greater than one, and a second group of particles having a length greater than L.sub.1, by feeding the mixture into a rotating cylindrical drum having inwardly opening indentations in its cylindrical wall having a transverse diameter of substantially L.sub.1. The drum is rotated about its longitudinal axis at speeds sufficient to entrap in the indentations and convey particles having a length below L.sub.1 comprising the first group upwardly to a height permitting the particles to fall into a fixed, upwardly opening trough, while retaining the second group of particles having a length above L.sub.1 in a bottom portion of the drum for separate recovery of the two groups of particles.
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