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Previous issue date: 2017-03-23 === In recent years the scientific community has a growing interest in studying
environmentally friendly agents sorption of carbon dioxide to be used in substitution
of chemical solvents based on amines. Among the technologies studied for this
purpose are those which use Ionic liquids that have the advantage of having very low
vapor pressures, higher density than water, a low melting point and a desorption low
energy; These qualities that make them environmentally friendly solvents, compared
with volatile organic solvents. Moreover ionic liquids are chemically and thermally
stable and can be used at relatively high temperatures, its physical-chemical
properties can be designed by varying the substitutive groups of the cation or the
combined ion. These characteristics make ionic liquids potentially important for the
development of new processes focused on the mitigation of global warming.
Otherwise the ionic liquids have a high viscosity, they are expensive making them
economically unfeasible for use in conventional processes with liquid gas absorption
columns. On the other side are available in the market the bubble glass that have
several applications in the industry, have low cost, high chemical and physical
resistance. This work evaluated in isochoric saturation cell, the carbon dioxide
solubility in mixed systems with boron silicate bubble glass, with volumetric
concentrations of 5% to 50%, in the ionic liquids [Bmim][BF4] and [mBmim] [NTf2] as
well as with pure ionic liquids. Data are reported at 27 Bar pressure and at
temperatures 303, 313, and 323 K. Mixed systems with 50% concentration of bubble
glass showed the best results of sorption and cost for both ionic liquids. === Nos ?ltimos anos existe na comunidade cient?fica um crescente interesse em
estudar agentes de sor??o de di?xido de carbono ambientalmente amig?veis para
serem utilizados em substitui??o aos solventes qu?micos baseados em aminas.
Entre as tecnologias estudadas para este fim est?o aquelas que utilizam os l?quidos
I?nicos (LI). Estes compostos apresentam como caracter?stica diferencial baix?ssima
press?o de vapor, densidade maior que a da ?gua, baixo ponto de fus?o e baixa
energia de regenera??o; qualidades estas que os tornam solventes ambientalmente
amig?veis quando comparados com os solventes org?nicos vol?teis. Por?m a alta
viscosidade e custo limitam o uso dos Lis. Estudos realizados com sistemas mistos
de LIs e part?culas s?lidas tem mostrado que tais part?culas podem potencializar a
a??o dos Lis, assim se identificou as microesferas de vidro, dispon?veis no mercado,
onde possuem diversas aplica??es na ind?stria, baixo custo, alta resist?ncia qu?mica
e f?sica. Neste trabalho foram avaliados sistemas mistos (Lis + microesferas de vidro
boro silicato) visando melhorar as propriedades dos Lis. Para avaliar estes novos
sistemas foram obtidos em c?lula de satura??o isoc?rica, dados experimentais de
solubilidade do di?xido de carbono, nas concentra??es volum?tricas de 5% a 50%.
Foram avaliados os LIs [Bmim] [BF4] e [mBmim] [NTf2] para obter os sistemas
mistos, assim como puros. Os dados s?o reportados na press?o de 27 Bar e nas
temperaturas 303, 313, e 323 K. Os sistemas mistos com concentra??o de 50% de
microesferas apresentaram os melhores resultados combinados de capacidade de
sor??o e custo para ambos os l?quidos i?nicos.
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