Kraft lignin depolymerization in sub- and supercritical water using ultrafast continuous reactors. Optimization and reaction kinetics was written by Abad-Fernandez, Nerea;Perez, Eduardo;Martin, Angel;Cocero, Maria J.. And the article was included in Journal of Supercritical Fluids in 2020.Quality Control of 4-Hydroxy-3-methoxyphenethanol The following contents are mentioned in the article:
Kraft lignin was rapidly depolymerised in a continuous reactor using sub- and supercritical water. The reaction yielded an aromatic oil rich in high value aromatic monomers such as guaiacol, vanillin, acetovanillone and homovanillic acid. Different temperatures between 300 and 400°C and reaction times from 60 ms were studied. An increment in reaction time at every temperature studied promoted secondary reactions of repolymn. of the lignin products. Those undesired reactions were more relevant as temperature increased. An optimal temperature of 386°C at a reaction time of 170 ms was found, with a maximum yield in phenolic compounds obtained. At those conditions, a bio-oil containing low mol. weight compounds was obtained with a yield of 44.6%. A selectivity to the four cited monomers of 9.9% was achieved, with little formation of solid residue (3.5%). A simple kinetic model was proposed to describe the yield for the different fractions and fitted to exptl. data. This study involved multiple reactions and reactants, such as 4-Hydroxy-3-methoxyphenethanol (cas: 2380-78-1Quality Control of 4-Hydroxy-3-methoxyphenethanol).
4-Hydroxy-3-methoxyphenethanol (cas: 2380-78-1) belongs to ethers. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Quality Control of 4-Hydroxy-3-methoxyphenethanol
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem