A green process for glycerol valorization to glycerol carbonate over heterogeneous hydrotalcite catalyst

Review on recent progress in catalytic carboxylation and acetylation of glycerol as a byproduct of biodiesel production

“…Specific reaction-influencing paramters such as temperature, which affects energy demand in transesterification; catalyst loading; and stoichiometric ratio of gycerol/DMC must be optimized to determine the conditions controlling the rate of adsorption, desorption, and surface reaction of transesterification of glycerol with DMC. Yadav et al [18] reported that transesterification with a hydrotalcite catalyst for GC synthesis are mainly controlled in three steps: adsorption of glycerol and DMC into the catalyst pores, surface reaction in the active sites between the basic sites and glycerol/DMC, and desorption of the produced GC. A pausible and popular method adopted by most researchers to optimize these parameters is by varying one variable or parameter while keeping the other parameters constant.…”

“…Studies on heterogeneous solid base catalysts, such as alkali metal oxide or alkali-mixed metal oxide catalysts, alkali-metal-functionalized zeolite catalysts, and hydrotalcite catalysts, provide insights into the catalysis and reaction mechanisms of base-catalyzed transesterification of glycerol with DMC to produce GC [18,55,59,64,65,78,79]. A three-step reaction mechanism has been identified in the transesterification reaction [18] When a highly basic catalyst (basicity H_418) is involved in transesterification, GC formed in situ in the reaction medium decomposes and forms glycidol, as reported by Pan et al [65]. The various reaction pathways proposed are conceptual and based on the peculiarity of applications.…”

“…Glycerol (1,2,3-propanetriol) [10][11][12][13][14][15] is the major byproduct of BD production, that is, 10 kg of glycerol is produced for every 100 kg of BD [16][17][18]. As such, glycerol supply linearly increases with increasing BD demand.…”

Effect of Hydrotalcite on Bromine Content in Oil Produced from the Pyrolysis of Acrylonitrile-Butadiene-Styrene Plastics

“…The adsorption of anions onto HT is known to proceed via the formation of inter-layer outer sphere complexes upon an anion exchange reaction [43]. Additionally, HT has been generating interest as a catalyst in bio-diesel fuel production, whereby a noted increased yield from 62% to 77% has been observed in the presence of HT catalyst [44], [45]. The catalytic activity of HT has been further demonstrated in the aerobic oxidation of benzyl alcohol [46].…”

Kinetics of the production of glycerol carbonate by transesterification of glycerol with dimethyl and ethylene carbonate using potassium methoxide, a highly active catalyst

“…In this line, several authors have tried to approach this reaction using K 2 CO 3 [28,34], CaO [35] or Al-Mg and Al-Ca based hydrotalcites [36,37] as catalysts.…”