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Leaching and Drying of Neem Flakes (Azadirachta indica) to Obtain a Botanical Insecticide
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Transport Phenomena. (Drying)
Faculty of Chemical Engineering, National University of Engineering (UNI), Managua, Nicaragua.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Transport Phenomena. (Drying)
Faculty of Chemical Engineering, National University of Engineering (UNI), Managua, Nicaragua.
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2008 (Spanish)In: Nexo, ISSN 1818-6742, Vol. 21, no 2, 54-64 p.Article in journal (Refereed) Published
Abstract [en]

The purpose of this work is to experimentally study the feasibility of improving the processing of neem flakes in columns by performing the leaching of insecticide without intermediate removal of the non-polar solvent and by performing simultaneously both leaching steps. The drying of the solvents remaining in the neem flakes is also experimentally studied. The parameters chosen to be studied in the leaching part of this work is leaching time, thickness of the flakes, volume ratio of solvents, and total volume of solvents. They were all shown to have a great influence on the yield of insecticide components, but the influence of solvent ratio was the most important one. It was shown that more methanol than hexane had to be used to obtain a large yield of insecticide compounds. The yield of oil was mainly influenced of the flake thickness. In the drying part obvious conclusions are difficult to make. What can be said is that the temperature of the incoming airflow has influence on the process. Conclusions about the drying time or the drying rate are not possible to make from the results of the experiments. The variations in drying time are too large and the drying rate seems to be independent of the conditions of the previous leaching step.

Place, publisher, year, edition, pages
Managua, Nicaragua: National University of Engineering (UNI) , 2008. Vol. 21, no 2, 54-64 p.
Keyword [en]
Natural insecticide; Leaching yield; Drying kinetics; Neem flakes; Non-polar solvent
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-85610OAI: oai:DiVA.org:kth-85610DiVA: diva2:500083
Note
QC 20120217Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2012-02-17Bibliographically approved

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http://www.doaj.org/doaj?func=abstract&id=398723&recNo=3&toc=1&uiLanguage=en

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