Retrofitting internal heat integration to a distillation column

Colin Pritchard, T Caldwell, W Morton

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The objective of this research was to develop a method of internal heat integration that could be retrofitted to an existing tray column. Hitherto, all designs for heat-integrated distillation columns (RIDiC) have relied on heat transfer through a heat-conducting wall separating a high-pressure rectifying section from a (concentric) lower-pressure stripping section. This method gives rise to major problems in scale-up, which have impeded its adoption in any industrial plant.

We have developed a method in which heat is transferred at each tray, or selected trays, to or from a circulating refrigerant mixture whose temperature glide in evaporation and condensation approximately matches the temperature profile in the rectification and stripping sections of the column respectively. Refrigerant vapour generated by absorption of heat and creation of internal reflux in the rectifying section is compressed externally, and the high-pressure vapour circulated through heat exchangers in the rectifying section, where it condenses and causes internal reboiling. The distillation column and its controls remain unchanged save for the installation of on-tray heat exchangers; the refrigerant circulation system is also self-contained and may be controlled independently.

Original languageEnglish
Title of host publicationEnergy-Efficient, Cost-Effective and Environmentally-Sustainable Systems and Processes, Vols 1-3
EditorsR Rivero, L Monroy, R Pulido, G Tsatsaronis
Place of PublicationMEXICO
PublisherINST MEXICANO DEL PETROLEO
Pages127-135
Number of pages9
ISBN (Print)968-489-027-3
Publication statusPublished - 2004
Event17th International Conference on Efficiency, Costs, Optimization, Simulation and Environmental Impact of Energy and Process Systems (ECOS 2004) - Guanajuato
Duration: 7 Jul 20049 Jul 2004

Conference

Conference17th International Conference on Efficiency, Costs, Optimization, Simulation and Environmental Impact of Energy and Process Systems (ECOS 2004)
CityGuanajuato
Period7/07/049/07/04

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