Made available in DSpace on 2014-12-17T14:09:18Z (GMT). No. of bitstreams: 1
FatimaRDF_TESE.pdf: 1276993 bytes, checksum: e49848d3c2dd72aa79cb38ebe1d84d84 (MD5)
Previous issue date: 2012-11-26 / Since the beginning of the National Program for Production and Use of
Biodiesel in Brazil, in 2004, different raw materials were evaluated for biodiesel
production, trying to combine the agricultural diversity of the country to the desire to
reduce production coasts. To determine the chemical composition of biodiesel
produced from common vegetables oils, international methods have been used widely
in Brazil. However, for analyzing biodiesel samples produced from some alternative
raw materials analytical problems have been detected. That was the case of biodiesel
from castor oil. Due the need to overcome these problems, new methodologies were
developed using different chromatographic columns, standards and quantitative
methods. The priority was simplifying the equipment configuration, realizing faster
analyses, reducing the costs and facilitating the routine of biodiesel research and
production laboratories. For quantifying free glycerin, the ethylene glycol was used in
instead of 1,2,4-butanetriol, without loss of quality results. The ethylene glycol is a
cheaper and easier standard. For methanol analyses the headspace was not used and
the cost of the equipment used was lower. A detailed determination of the esters
helped the deeper knowledge of the biodiesel composition. The report of the
experiments and conclusions of the research that resulted in the development of
alternative methods for quality control of the composition of the biodiesel produced in
Brazil, a country with considerable variability of species in agriculture, are the goals of
this thesis and are reported in the following pages / No Brasil, desde o in?cio do Programa Nacional de Produ??o e Uso do
Biodiesel, em 2004, diversas mat?rias primas foram avaliadas para a sua produ??o,
tentando aliar a diversidade agr?cola do pa?s ao desejo de diminuir os custos de
produ??o. Para determinar a composi??o qu?mica de amostras de biodiesel produzidas
a partir dos ?leos mais comuns, os m?todos internacionais t?m sido largamente
utilizados no Brasil. Por?m, para an?lises de biodiesel produzido a partir de algumas
mat?rias primas alternativas, alguns problemas anal?ticos foram detectados. Esse foi o
caso do biodiesel de mamona. Devido ? necessidade de contornar esses problemas,
novas metodologias foram desenvolvidas, utilizando colunas cromatogr?ficas, padr?es
e diferentes m?todos para quantifica??o, privilegiando a sempre simplifica??o dos
equipamentos, a realiza??o de an?lises mais r?pidas, diminuindo os custos e facilitando
a rotina dos laborat?rios de pesquisas e de produ??o do biodiesel. No caso das an?lises
para quantifica??o da glicerina livre, o etilenoglicol, padr?o muito mais barato e de
f?cil aquisi??o, foi utilizado no lugar do 1,2,4-butanotriol, sem perda da qualidade dos
resultados. Nas an?lises do metanol a n?o utiliza??o do headspace, diminuiu os custos
do equipamento utilizado. A determina??o detalhada dos ?steres presentes ajudou o
conhecimento mais profundo da composi??o de amostras de biodiesel provenientes de
mat?rias primas alternativas. O relato dos experimentos e as conclus?es das pesquisas
que resultaram no desenvolvimento de metodologias alternativas para controle de
qualidade da composi??o do biodiesel produzido no Brasil, pa?s com enorme
variabilidade de esp?cies na agricultura, s?o os objetivos dessa tese e est?o relatados
nas p?ginas seguintes
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/13036 |
| Date | 26 November 2012 |
| Creators | Faria, Fatima Regina Dutra |
| Contributors | CPF:42314070453, http://lattes.cnpq.br/1595902438130772, Ara?jo, Ant?nio Souza de, CPF:35530502415, http://lattes.cnpq.br/9770622597949866, Ursini, Cleber Vinicius, CPF:07953167808, http://lattes.cnpq.br/6126021095539502, Castro, Francisco Laerte de, CPF:77862589491, http://lattes.cnpq.br/2913544384537886, Gabardo, Irene Terezinha, CPF:27460266949, http://lattes.cnpq.br/7734138385292211, Fernandes J?nior, Valter Jos? |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia do Petr?leo, UFRN, BR, Pesquisa e Desenvolvimento em Ci?ncia e Engenharia de Petr?leo |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
Page generated in 0.0025 seconds