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XXXI.—Thermal Diffusion in some Aqueous Solutions

Published online by Cambridge University Press:  14 February 2012

Archibald C. Docherty  and
Mowbray Ritchie
Archibald C. Docherty
Affiliation:
Chemistry Department, University of Edinburgh
Mowbray Ritchie
Affiliation:
Chemistry Department, University of Edinburgh
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Summary

Thermal diffusion in aqueous solutions of raffinose, sucrose, glucose, xylose, glycerol and acetone was studied in respect of variation of concentration and of temperature. Initial rates of separation were determined as produced by an apparatus consisting of two vertical concentric glass tubes of length 130 cm. and mean annular separation o·68 mm.

With a solution of glucose of 1·7 gm. mol. per litre, the initial rate of separation for the extremes of temperature which could be experimentally applied was found to be independent of the column length for lengths greater than 100 cm.

With the exception of acetone, all the solutes concentrated at the column foot. In singlesolute solutions a maximum rate was observed at an intermediate concentration, which in the sugar series was at a lower molar concentration the higher the molar weight of the solute. With the two-solute solutions sucrose-glucose and sucrose-glycerol little or no relative separation was obtained, contrary to expectation based on the single-solute data.

Initial rates increased with rise in mean temperature and with increase in the applied temperature gradient.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh Section A: Mathematics , Volume 62 , Issue 3 , 1948 , pp. 297 - 304
Copyright
Copyright © Royal Society of Edinburgh 1946

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References

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