Chemical Engineering & Technology

Cover image for Vol. 38 Issue 12

Impact Factor: 2.442

ISI Journal Citation Reports © Ranking: 2014: 33/135 (Engineering Chemical)

Online ISSN: 1521-4125

Associated Title(s): Chemie Ingenieur Technik, ChemBioEng Reviews, Energy Technology

Editors' Choice

Every month, the Editors select two papers referring to current discussions in the scientific, public and economic communities and in view of the potential for further developments. The papers are freely accessible for one month.

Precipitation in a Micromixer – From Laboratory to Industrial Scale

November 13, 2015


Precipitation technology is widely applied in chemical and fine chemical industry, especially for making functional materials like catalysts and pigments. If very fine particles with a narrow particle size distribution are desired, the homogeneous route should be promoted. This is a difficult task since nucleation of solid particles and consumption of reagents reduces the driving force. Therefore, high levels of supersaturation can only be obtained for a short time and within limited volumes of solution. Such a rapid change of composition and conditions can be easily achieved in micromixers. This technology is also interesting for making particular functional materials that are larger in size. The application of micromixers for precipitation has already been reported; however, even though different types of micromixers were tested, clogging was observed. L. Mleczko et al. developed a micromixer-based precipitation technology for preparation of a heterogeneous catalyst. The so-called valve-assisted micromixer allowed in the synthesis of a carbon nanotube catalyst stable operation without clogging. With this design that has already been scaled up, precipitation at throughput rates up to 300 L h-1 is possible.

Aurel Wolf, Volker Michele, Oliver F.-K. Schlüter, Frank Herbstritt, Joachim Heck, and Leslaw Mleczko
Precipitation in a Micromixer – From Laboratory to Industrial Scale
Chem. Eng. Technol. 2015, 38 (11), 017–2024.
DOI: 10.1002/ceat.201500040