Stedman packing

Stedman Packing Available in metal only, usually used in batch and continuous distillation in small diameter columns not exceeding 24-inches dia. High fractionation ability per unit height, best suited for laboratory work. Conical and triangular types available. Not much industrial data available. 

Stedman packing, see entry under Stedman column. 

Fig. 257). They have also been studied extensively by Westhaver [26], Donnell and Kennedy [27] and recently by Jantzen and Wieckhorst [28], who compared them with columns containing Stedman packing and wire spirals. As shown by Fig. 255, tlie concentric-tube column is superior to the last-named types at loads below KX) ml/h. The loss in pressure in a concentric-tube column can be calculated [21] by...

Data for a column with original Stedman packing and Stedman packing as modified by Koch and van Raay (Column diameter 25 mm column length 1 m)... 

The fractionating column may be a 16-plate Stedman column or a 30-cm. Carborundum-packed column.1... 

Likely impurities are other chlorinated methylsilanes, and tetrachlorosilane (b 57.6°/atm), some of which can form azeotropes. To avoid the latter very efficient fractional distillation is required. It has been fractionated through a 12 plate glass helices packed column with only the heart-cut material used. It has also been fractionated through a 90cm, 19mm diameter Stedman column. Also purified by redistilling from CaH2 before use. [/ACS 70, 4254, 4258 7948 JOC 23 50 7958],... 

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