02024nas a2200241   4500008004100000022001400041245011800055210006900173260000900242300001200251490000600263520120900269653003301478653001601511653001501527653002301542653001401565100001801579700001801597700001801615700002501633856012401658       2020                        eng d  a2365-654900aIntegration of heterogeneous acid and base catalysis for clean synthesis of jet-fuel precursor from carbohydrates0 aIntegration of heterogeneous acid and base catalysis for clean s  cJAN   a392-4000 v53 a<p>C-12 branched alkane fuel precursor was produced from carbohydrates using an efficient integrated solid acid and base catalysis approach involving: i) isomerisation-dehydration of carbohydrates to 5-(hydroxymethyl)furfural (HMF) over solid acid catalyst having both Lewis and Bronsted sites) in a biphasic MIBK (methylisobutylketone): water + DMSO solvent system and ii) Claisen-Schmidt condensation of crude HMF with MIBK over solid base catalyst. Initially, high yield of jet fuel precursor, (E)-1-(5-(hydroxymethyl)furan-2-yl)-5-methylhex-1-en-3-one from pure HMF and MIBK was achieved over basic CaMgAl(231) catalyst. The glucose dehydration to HMF was optimized in biphasic MIBK: H2O-NaCl: DMSO (8:1.5:0.5; v/v/v) system, with complete glucose conversion and 42% HMF yield over Zr-Mont possessing both Lewis and Bronsted acid sites. In an integrated dehydration + Claisen-Schmidt condensation sequence, Zr-Mont catalyst was filtered off and the crude HMF with MIBK underwent Claisen-Schmidt condensation over CaMgAl(231) catalyst. The overall 32% yield of Claisen-Schmidt condensation product was achieved from glucose. MIBK acting also as a product extractant, could be recovered upto 80%.</p>
10aClaisen-Schmidt condensation10adehydration10aintegrated10ajet-fuel precursor10arenewable1 aShinde, Suhas1 aTarade, Komal1 aMitra, Gaurav1 aRode, Chandrashekhar  uhttps://library.ncl.res.in/content/integration-heterogeneous-acid-and-base-catalysis-clean-synthesis-jet-fuel-precursor