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A flash vaporizing flow calorimeter for the measurement of enthalpy increments. Test measurements onn-hexane atT =  473.2 K andT =  510.2 K and pressures up top =  5.2 MPa

✍ Scribed by C.J. Wormald; M. Massucci; G. Malliband; A. Simpson

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
183 KB
Volume
31
Category
Article
ISSN
0021-9614

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✦ Synopsis

A new design of flow calorimeter for the measurement of enthalpy increments is reported. The novel feature is that the calorimeter is a flash vaporizer mounted in a small bath of heated silicone oil. Cold liquid pumped into the calorimeter is vaporized and electrical energy supplied to the oil-bath is adjusted by a computer to offset exactly the incremental enthalpy change and maintain the oil at a constant temperature. The apparatus is designed to operate over the temperature range T = 240 K to T = 523 K at pressures up to p = 10 MPa. A measurement of the incremental enthalpy change can be made in 30 min. Test measurements on n-hexane at pressures up to p = 5.2 MPa have been made in the liquid and gaseous regions at the temperature T = 473.2 K, and in the supercritical region at T = 510.2 K. The accuracy of the measurements is Β± 2 per cent.

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