Gauze ring

An excellent but expensive packing for columns consists of Dixon gauze rings. They are small gauze rings of Lessing shape made of Staybrite (stainless steel) gauze. A useful size is X 5 one pound of these occupies about 750 ml. 

The packing consists of stainless steel Dixon gauze rings jV X 1 5", or of 4 mm. glass helices. 

An early CO distillation pilot plant described by Johns (in London (1961), reading list), used a two section vacuum insulated column packed with wire gauze rings. The upper section was 5.2 m long with a diameter of 3.2cm, the lower 4.6 m x 1.9 cm. The column contained about 600 plates. An intermediate boiler re-evaporated part of the downward flowing liquid at the junction. This plant accumulates product in the liquid and enriches toward the bottom. Enriched CO (0.4 g day-1 of 65% 13C and 0.05 g day-1 of 5% lsO) was withdrawn from the bottom... 

Disulphides, 1078 dialkyl, 496, 498 Dithizone, 955 Di-p-tolyl ketone, 930, 931 Dixon gauze rings, 97 n-Dodecane, 237 n-Dodecyl bromide, 282 n-Dodecyl chloride, 275 n-Dodecyl p-toluenesuiphonate, 825 Doebner reaction, 463, 465, 710, 711, 719... 

Pressure drop found with wire gauze rings (3x3 mm) as a function of the throughput at atmospheric pressure. Column diameter j25 mm average height of packing 1 m (measurements by Thiirkauf)... 

Fig. 346/, Raschig gauze rings, with or without partition, 3 — 10 mm ...

Tests with bronze wire-gauze rings, 3x3 mm, single turn, no partition, by Kinchbaum Column diameter 100 mm packed layer 1000 mm test mixture n-heptane-methylcyclohexane u = cc... 

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