sulfuric acid followed by vacuum distillation yields technical-grade vanillin, which must be recrystallized several times to obtain food-grade vanillin.Water, to which some ethanol may be added, is used as the solvent in the last crystallization step....
Early synthetic route is that safrole oil as raw material, the alcohol solution of potassium hydroxide reacted hot pressing enable to open ring, and then used sodium ethyl sulfate to make the hydroxy ethylation, finally in the ethanol solution with sulfuric acid hydrolysis to obtain the vanitro...
A mixture of heptanone, ethanol, and sulfuric acid (a volume ratio 4 : 5 : 1) was proposed as a developing agent. Different eluents and developing agents used for the separation of vanillin and ethylvanillin were compared; the results are presented. Solutions of vanillin and ethylvanillin and...
Method A: Solvent-assisted synthesis. In a conical flask, combine vanillin (0.01 M) with the selected substituted aromatic amines (0.01 M). To this mixture, add a few drops of concentrated sulfuric acid (H2SO4) and approximately 15-20 mL of ethyl alcohol as a solvent. Stir the reaction ...
The present invention is copper sulfate was added to the ethanol was heated to reflux, stir, add dissolved in ethanol amino N, N-dimethyl aniline, a solution of sulfuric acid, sodium nitrite, and the reaction to stabilize, add distilled water, ethanol, After cooling with ice water, sodium ...
sulfuric acid followed by vacuum distillation yields technical-grade vanillin, which must be recrystallized several times to obtain food-grade vanillin.Water, to which some ethanol may be added, is used as the solvent in the last crystallization step....
Reaction conditions: 80 °C; 0.84 g cyclopentanone (0.98 g cyclohexanone), 3.04 g vanillin, 0.10 g concentrated sulfuric acid and 10 mL ethanol. The objective of this work is to synthesize biomass liquid fuel. Considering that the 2,5-bis(4-hydroxy-3-methoxybenzylidene) cyclopentanone contains...