Influence of impurities on the epoxidation of allyl alcohol to glycidol with hydrogen peroxide over titanium silicate TS-1

Enhancing allyl alcohol selectivity in the catalytic conversion of glycerol; influence of product distribution on the subsequent epoxidation step

“…Titanium silicate‐1 catalyst was synthesised as per Taramasso et al . and reported previously by us where 37.99 g (0.182 mol) of tetraethylorthosilicate (Merck) and 0.61 g (0.003 mol) tetratethylorthotitanate (Merck) were mixed at 35 °C. The mixture was then cooled in an ice bath, and 39.54 g (0.194 mol) of tetraethylammonium hydroxide template (40 wt% in water, Merck) was added dropwise using a burette.…”

“…The fine, white product was recovered and washed by centrifugation and dried overnight at 393 K before being calcined in air at 823 K for 4 h and heated with a ramp rate of 2 K per minute. X‐ray diffraction using a Philips X'pert Pro diffractometer with Cu K α incident radiation ( λ = 1.5406 Å) and that diffraction pattern have been compared with samples synthesised by others and have been published elsewhere …”

“…deposited alkali metals on zirconia–iron oxide catalysts for glycerol conversion, while we previously reported correlations between acidity/basicity and allyl alcohol production . In this contribution, the focus is to link the effects produced by alkali catalyst modification in the first reaction to the epoxidation of glycidol, because the formation of certain impurities (promoted/impeded by changes in acidity/basicity) has found to influence the epoxidation reaction . The unsaturated alcohol produced from glycerol may be epoxidised to produce glycidol.…”

First Attempt of Glycidol‐to‐Monoalkyl Glyceryl Ethers Conversion by Acid Heterogeneous Catalysis: Synthesis and Simplified Sustainability Assessment

“…[12,13] Glycidol was also recently recognizeda sa ni nteresting and valuable starting chemicalt op roduce MAGEs. [21] In the past, different alternative strategies have been investigated such as the basic treatment with KOH of 3-chloro-1,2-propanediol in alcoholic solution, [22,23] and the epichlorohydrin treatment with caustic [24] without any industrial developments. with different industrial applications.…”

“…[17][18][19][20] Nowadays, the worldwide glycidol market is based on the fossil-based route that involves the oxidation of allyl alcohol, obtained in turn from propylene, promoted by titanium silicate (TS-1) catalysti nt he presence of H 2 O 2 with ac onversiono f 47 %a nd as electivity of 92.5 %t owardg lycidol. [21] In the past, different alternative strategies have been investigated such as the basic treatment with KOH of 3-chloro-1,2-propanediol in alcoholic solution, [22,23] and the epichlorohydrin treatment with caustic [24] without any industrial developments. More recently, new synthetic processes (glycerol carbonated ecomposition and glycerolt ransesterification with dimethylcarbonate catalyzed by mixed oxides, mainly Ba and lanthanides) have been proposed, but they seem to be, at the moment,n ot economically and environmentally viable.…”