1000 resultados para Crèdit comercial
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1850/05/39 (N568)-1850/06/04 (N574).
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1849/11/07 (N370)-1849/11/13 (N376).
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1849/03/06 (N126)-1849/03/13 (N133).
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1849/07/25 (N266)-1849/07/31 (N272).
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1848/11/29 (N29)-1848/12/05 (N35).
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1850/06/26 (N596)-1850/07/02 (N602).
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1849/12/05 (N396)-1849/12/11 (N402).
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1850/03/13 (N493)-1850/03/19 (N499).
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1849/10/10 (N344)-1849/10/16 (N350).
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1850/05/15 (N555)-1850/05/21 (N560).
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1849/04/11 (N161)-1849/04/17 (N167).
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1848/11/15 (N15)-1848/11/21 (N21).
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Ethyl tert-butyl ether (ETBE) is produced by commercial processes to a purity of up to 96%. In recent years, several companies have started to produce ETBE, increasing the demand for standards with higher grades of purity in the area of production control and final product certification. The present work involved the development of a purification protocol for obtaining high purity ETBE from the commercial product used in the formulation of automotive gasolines, using a spinning band distillation column. The ETBE thus produced showed a purity of over 99.5%, its main contaminant being its isomer, ethyl-sec-butyl ether (ESBE).
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The present work aimed modify chemically the chitosan (QTS) surface to obtain a reticulate chitosan quaternary ammonium salt (SAQQR), and compare this anionic exchanger with an commercial ion exchanger in the extraction of available phosphorus in soils. The results showed that the two exchangers are identical, extracting similar and proportional quantities of available phosphorus in the studied soils, and the anionic exchanger of SAQQR provides a high chemical stability, not affected by the pH difference of soils.
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Omega-3 enriched partial acylglycerols are beneficial for human health. The aim of this study was to obtain monoacylglycerols (MAG) and diacylglycerols (DAG) by means of glycerolysis of fish oil catalyzed by a lipase from Rhizomucor miehei in the presence of food grade surfactants (Tween 65, 80 or 85). Glycerolysis was successful in the reaction media for all the tested surfactants, showing their potential for use as additives in such a system. The best results, however, were obtained for the reaction medium in the absence of surfactant whose peroxide value was the lowest after glycerolysis.
