Change search
ReferencesLink to record
Permanent link

Direct link
Influence of different scales of mixing in reaction crystallization
KTH, Superseded Departments, Chemical Engineering and Technology.
2001 (English)In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 56, no 7, 2459-2473 p.Article in journal (Refereed) Published
Abstract [en]

Experiments on semibatch reaction crystallization of benzoic acid are reported. The conditions in an agitated tank are simulated by a loop reactor by which feed point mixing conditions can be controlled separately from the macroscale circulation rate. Hydrochloric acid is fed into a circulating solution of sodium benzoate and the influence of macromixing, mesomixing and micromixing on the product crystal mean size is evaluated. The product mean size increases with increasing circulation rate in the loop, with increasing feed point mixing intensity, with decreasing feed rate and with decreasing feed pipe diameter. Increased mixing intensity on any level leads to larger product crystals, but especially the rate of mesomixing is of importance. The influence of the feed pipe diameter is opposite to predictions by available theories and cannot be explained by backmixing into the feeding pipe. All results can be correlated quite well against a dimensionless mixing efficiency defined as the ratio of the reactant feeding time to the mixing time. The mixing time is the sum of the time constants for mesomixing and micromixing. A new mesomixing time constant is defined as being proportional to the ratio of the feed pipe diameter and the velocity of the bulk flow passing the feed pipe.

Place, publisher, year, edition, pages
2001. Vol. 56, no 7, 2459-2473 p.
Keyword [en]
reaction crystallization, precipitation, benzoic acid, macromixing, mesomixing, micromixing, semibatch, loop reactor, backmixing, colour experiments, feed semibatch precipitation, stirred-tank reactors, chemical-reaction, model, prediction, size
URN: urn:nbn:se:kth:diva-20610ISI: 000168599100021OAI: diva2:339306
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Rasmuson, Åke C.
By organisation
Chemical Engineering and Technology
In the same journal
Chemical Engineering Science

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 19 hits
ReferencesLink to record
Permanent link

Direct link