Document Detail


Low quality vegetable oils as feedstock for biodiesel production using K-pumice as solid catalyst. Tolerance of water and free fatty acids.
MedLine Citation:
PMID:  22799882     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Waste oils are a promising alternative feedstock for biodiesel production due to the decrease of the industrial production costs. However, feedstocks with high free fatty acids (FFA) content present several drawbacks when alkaline catalyzed transesterification reaction is employed in biodiesel production process. Nowadays, in order to develop suitable processes capable of treating oils with high free fatty acid content, a two-step process for biodiesel production is being investigated. The major problem that it presents is that two catalysts are needed to carry out the whole process: an acidic catalyst for free fatty acids esterification (first step) and a basic catalyst for pre-treated product transesterification (second step). The use of a bifunctional catalyst, which allows both reactions simultaneously, could minimize production costs and time. In the present study, the behaviour of pumice, a natural volcanic material used as heterogeneous catalyst, was tested using oils with several FFA and water content as feedstocks in the transesterification reaction to produce biodiesel. Pumice as bifunctional solid catalyst, which can catalyze simultaneously the esterification of FFA and the transesterification of fatty acid glycerides into biodiesel, showed to be an efficient catalyst for low-grade, non-edible oil feedstocks.
Authors:
L Díaz; M E Borges
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-16
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  -     ISSN:  1520-5118     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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