2 research outputs found
Autocatalytic Production of 5‑Hydroxymethylfurfural from Fructose-Based Carbohydrates in a Biphasic System and Its Purification
An
efficient autocatalytic process for the production of 5-hydroxymethylfurfural
(HMF) from fructose-based carbohydrates has been investigated without
the addition of any external catalysts in a methyl isobutyl ketone/water
biphasic system, leading to elevated HMF yield through continuous
extraction of HMF from an aqueous solution. The results show that
both the reaction temperature and time have significant effects on
fructose conversion and HMF yield; 96.8% of fructose can be converted
into 73.6% of HMF with a small amount of levulinic acid and formic
acid formed at a point of compromise between the reaction temperature
and time (160 °C for 2 h). In addition, this autocatalytic system
is suitable for other fructose-based feedstocks, such as sucrose and
inulin, to achieve acceptable HMF yield. Moreover, a simple and efficient
purification strategy for as-prepared HMF, viz., the NaOH neutralization
method, has also been tested, achieving more than 99% of HMF recovery
with more than 98% of purity correspondingly
Synthesis of Ionic Liquid-SBA-15 Composite Materials and Their Application for SO<sub>2</sub> Capture from Flue Gas
A series of 1,3-bispropyltriethoxysilane-imidazolium
chloride (FILs)-modified
SBA-15 adsorbents have been prepared, characterized, and applied in
SO<sub>2</sub> capture for the first time. At low FILs loadings, significant
levels of grafting were observed, while higher loading levels resulted
in retention of a greater fraction of FILs precursors, as evidenced
by FTIR spectroscopy. Textural properties gradually declined as FILs
content increased, in conjunction with an apparent change in the regular
nature of the SBA-15 pore structure and bulk particle morphology,
as demonstrated by XRD, TEM, and SEM. SO<sub>2</sub> adsorption breakthrough
curves indicated that all materials possessed rapid and facile adsorption
properties, with <i>t</i><sub>0.9</sub> values 1–2
orders of magnitude lower than those obtained over comparable materials
under more favorable conditions. The largest total SO<sub>2</sub> adsorption
was achieved over 10%FILs@SBA-15, which exhibited a maximized FILs
adsorption contribution that remained constant at higher loadings.
Corrections against surface area demonstrated that a continual increase
in adsorption were apparent, verifying the importance of the change
in nature of the FILs at higher loadings. The optimized adsorbent
demonstrated few strong SO<sub>2</sub> binding sites, as indicated
by excellent stability during adsorption–desorption cycles