Liquid holdup and flow dispersion in zeolite packed beds

Inglezakis, VJ; Lemonidou, M; Grigoropoulou, HP

dc.contributor.author	Inglezakis, VJ	en
dc.contributor.author	Lemonidou, M	en
dc.contributor.author	Grigoropoulou, HP	en
dc.date.accessioned	2014-03-01T01:16:40Z
dc.date.available	2014-03-01T01:16:40Z
dc.date.issued	2001	en
dc.identifier.issn	0009-2509	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14164
dc.subject	Carborundum	en
dc.subject	Clinoptilolite	en
dc.subject	Dispersion	en
dc.subject	Liquid holdup	en
dc.subject	Packed bed	en
dc.subject	Peelet number	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	Dispersions	en
dc.subject.other	Packed beds	en
dc.subject.other	Porous materials	en
dc.subject.other	Reynolds number	en
dc.subject.other	Trace analysis	en
dc.subject.other	Zeolites	en
dc.subject.other	Liquid holdup	en
dc.subject.other	Residence time distribution	en
dc.subject.other	Chemical engineering	en
dc.subject.other	ion exchange	en
dc.subject.other	packed bed	en
dc.subject.other	porosity	en
dc.subject.other	zeolite	en
dc.title	Liquid holdup and flow dispersion in zeolite packed beds	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0009-2509(01)00189-0	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0009-2509(01)00189-0	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	A simple tracing method, based on residence time distribution measurements, is presented for the evaluation of the liquid holdup and dispersion in zeolite packed beds. Two tracers and two different materials. one porous (zeolite clinoptilolite) and one non-porous (SiC), were used in experiments on seven packed beds of different dimensions, operating under downflow or upflow condition, in the range of superficial velocities from 0.04 to 0.61 x 10(-2) m/s. The corresponding superficial Reynolds number is between 0.6 and 8.50. Drainage and tracing methods are experimentally compared. The tracing techniques tested are reliable and applicable for the determination of liquid holdup and dispersion in clinoptilolite beds. Liquid holdup, as % of void volume of the bed, is 90 +/- 10% for upflow condition, independent of the superficial velocity. For downflow condition it reaches 80% for superficial velocities greater than 0.4 x 10(-2) m/s. Peclet numbers were determined, giving different trends for upflow and downflow conditions. For superficial velocity near 0.4 x 10(-2) m/s (Reynolds number near 4) and greater, Peclet numbers are identical and in the vicinity of 0.12. A discussion is conducted in order to clarify this observation. Approximate correlations are proposed for liquid holdup and Peclet number in zeolite packed beds. (C) 2001 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Chemical Engineering Science	en
dc.identifier.doi	10.1016/S0009-2509(01)00189-0	en
dc.identifier.isi	ISI:000171260900008	en
dc.identifier.volume	56	en
dc.identifier.issue	17	en
dc.identifier.spage	5049	en
dc.identifier.epage	5057	en