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Precise laboratory fractionation an automatically controlled column

โœ Scribed by Highet, H. C. ;Godin, G. W. ;Philpotts, A. R. ;Twigg, G. H.

Publisher
Wiley (John Wiley & Sons)
Year
1950
Weight
653 KB
Volume
69
Category
Article
ISSN
0368-4075

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โœฆ Synopsis

Abstract

This paper discusses a method of reducing heat losses from laboratory fractionating columns. A differential thermocouple in the lagging detects radial heat flow and controls the current passing through an electrical heater winding in the lagging, by means of a galvanometer, lamp and photocell relay system. Thermal and electrical characteristics are calculated for equipment required to maintain a number of columns adiabatic by intermittent inspection and control. In the second part of the paper construction and operation of a column lagging jacket, controller and inspection unit arc described. Heat losses are reduced to negligible dimensions and up to six jackets have been controlled simultaneously at temperatures up to 265ยฐ c. The equipment has been in use for three years with little attention.

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