The mixing of liquid propane and liquid normal butane at one atmosphere
The mixing of liquid propane and liquid normal butane at one atmosphere
The mixing of propane, or propane-rich liquids, with n-butane, or n-butane-rich liquids, under 1 atm. pressure in fully refrigerated vessels is widely practised in the liquefied petroleum gas (L.P.G.) industry. A common experience during these mixing operations is that the volume of vapour generated depends on whether the propane is added to the n-butane or vice versa. In general, about twice as much vapour is generated when a propane/n-butane mixture is produced by adding propane to n-butane compared with adding n-butane to propane. This work describes: (a) A rig developed for the mixing of two boiling liquid gases at 1 Atm. (b) Some experimental mixing results carried out on a laboratory scale which demonstrate that the phenomenon is not an artefact. The results obtained showed that: 1. The vapour contains some n-butane. 2. When propane is added to n-butane, with surface and bottom delivery, the boil-off is affected by the delivery rate. 3. When adding propane to n-butane, the volume of vapour evolved is between 1.5 and 2.0 times the volume produced by adding n-butane to propane to produce the same mixture. 4. The volumes of vapour generated are larger when the pure components are mixed. (c) A path-dependent mixing model is developed which predicts the vapour volume generated within the experimental error. The model decouples the vapour generation and liquid mixing processes, and indicates how C3/n-C4 mixing generates much larger volumes of vapour than a n-C4/C3 mixing operation. (D72032/87)
University of Southampton
1986
Tchikou, Ahmed
(1986)
The mixing of liquid propane and liquid normal butane at one atmosphere.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The mixing of propane, or propane-rich liquids, with n-butane, or n-butane-rich liquids, under 1 atm. pressure in fully refrigerated vessels is widely practised in the liquefied petroleum gas (L.P.G.) industry. A common experience during these mixing operations is that the volume of vapour generated depends on whether the propane is added to the n-butane or vice versa. In general, about twice as much vapour is generated when a propane/n-butane mixture is produced by adding propane to n-butane compared with adding n-butane to propane. This work describes: (a) A rig developed for the mixing of two boiling liquid gases at 1 Atm. (b) Some experimental mixing results carried out on a laboratory scale which demonstrate that the phenomenon is not an artefact. The results obtained showed that: 1. The vapour contains some n-butane. 2. When propane is added to n-butane, with surface and bottom delivery, the boil-off is affected by the delivery rate. 3. When adding propane to n-butane, the volume of vapour evolved is between 1.5 and 2.0 times the volume produced by adding n-butane to propane to produce the same mixture. 4. The volumes of vapour generated are larger when the pure components are mixed. (c) A path-dependent mixing model is developed which predicts the vapour volume generated within the experimental error. The model decouples the vapour generation and liquid mixing processes, and indicates how C3/n-C4 mixing generates much larger volumes of vapour than a n-C4/C3 mixing operation. (D72032/87)
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Published date: 1986
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Local EPrints ID: 460749
URI: http://eprints.soton.ac.uk/id/eprint/460749
PURE UUID: d21096c4-4020-4db9-8192-28232f945de6
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Date deposited: 04 Jul 2022 18:29
Last modified: 04 Jul 2022 18:29
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Author:
Ahmed Tchikou
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