Abstract
Abstract In this paper, we investigated the effect of temperature, glycerol etherification concentration with benzaldehyde, organic solvent and catalyst reuse effects using a cationic acidic resin as catalyst for production of green cyclic acetals of high commercial value. The best reaction conditions show a conversion above 93% of glycerol and yield to cyclic acetals above 61%. The highest selectivity elements observed were 2-phenyl-1,3-dioxan-5-ol, in cis and trans isomer forms reaching 80%. The temperature had a positive effect increasing on glycerol conversion, though it also favored the formation of undesired compounds. A high concentration of benzaldehyde reactant kept the selectivity values constant but increased glycerol conversion resulting in higher yields, mainly when organic solvents were used. Reuse of the catalyst resulted in a slight decrease in yield values, which demonstrated stability and durability of the catalyst used.
Highlights
Considering all the biodiesel production chain, it is necessary to observe the glycerin formation, generated as a byproduct
In this paper, we investigated the effect of temperature, glycerol etherification concentration with benzaldehyde, organic solvent and catalyst reuse effects using a cationic acidic resin as catalyst for production of green cyclic acetals of high commercial value
The temperature had a positive effect increasing on glycerol conversion, though it favored the formation of undesired compounds
Summary
Considering all the biodiesel production chain, it is necessary to observe the glycerin formation, generated as a byproduct. According to the Brazilian Ministry of Development, Industry and Foreign Trade, Brazil produced approximately 380,000 tons of glycerin and exported 244,000 tons of crude glycerin and 60,000 tons of refined glycerin (glycerol), indicating internal consumption of glycerol of 76,000 tons [4]. This large production of glycerol must be destined to develop new chemical products to take advantage of its potential and to add economic production values
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