One, at present, the synthetic method of isoeugenol all has the relatively complicated production technique, and the production cost is high, or the reaction waste liquid pollutes the environment, or the problem that the cis-isoeugenol content is too high. CN201410100405.2 provides a method for synthesizing isoeugenol, aiming at solving the complicated production process and high production cost in the current synthesis method of isoeugenol, or the reaction waste liquid pollutes the environment, or the content of cis-isoeugenol is too high high problem. Include the following steps:
(1) Add clove powder to 1 mol/L potassium hydroxide solution and ethanol, and place at 100-130 °C under the action of ultrasonic waves for 1-2 hours to obtain a decomposition solution; wherein, the clove powder, potassium hydroxide solution and ethanol The mass-to-volume ratio is (20-30) kg: (5-10) L: (5-10) L;
(2) After stirring and mixing the decomposed liquid and toluene, heat and distill in a vacuum state, control the temperature of the distillation heating place to be 50-90°C, control the volatilization outlet temperature of the distillation gas to be 35-45°C, and condense the distilled gas with a condenser After collection, low-boiling impurities are obtained; wherein, the volume ratio of the decomposed liquid to toluene is (5-10): (3-4);
(3) Continue to distill the remaining filtrate after removing low-boiling impurities in the step (2), control the temperature of the distillation heating place to be 100°C to 120°C, and control the volatilization outlet temperature of the distillation gas to be 90 to 105°C. Isoeugenol is obtained after condenser condensation and collection.
In the present invention, the required amount of alkali liquor is greatly reduced, and the reaction process liquid can be directly used for distillation without extraction and separation, and the operation is simpler; It is more commonly used, and the production cost is very low; more importantly, the content of the trans-isoeugenol obtained by the present invention in the isoeugenol can reach more than 95%.
2. CN201410811548.4 provides a method for preparing isoeugenol by utilizing ruthenium-based or rhodium-based catalysts to catalyze pyrolysis of biomass. According to the method provided by the present invention, using biomass as raw material, biomass and ruthenium-based or rhodium-based catalysts are mechanically mixed in a mass ratio of (10:1) to (1:3), and then under anaerobic conditions at 250 Rapid pyrolysis is carried out at ~400°C, and a liquid product rich in isoeugenol can be obtained after the pyrolysis gas is condensed. The ruthenium-based or rhodium-based catalysts used in the present invention can greatly promote the formation of isoeugenol during the pyrolysis of Pinaceae, Cedaraceae, Cedaraceae or Araucaria biomass, and simultaneously inhibit the pyrolysis of cellulose and hemicellulose. Forms volatile organic products and inhibits the pyrolysis of lignin to form other phenolic products. Therefore, the composition of the liquid product obtained is relatively simple, and the purity of isoeugenol is higher, which greatly simplifies its subsequent separation and purification process. Secondly, the catalyst has stable performance and can be separated from the pyrolysis residue by a mechanical method to realize recycling. In addition, the present invention controls the pyrolysis temperature at 250-400°C, and the pyrolysis product is less at a lower pyrolysis temperature, which is not only beneficial to control the product composition and further improve the selectivity to isoeugenol, but also affects the equipment and reaction conditions. The requirements are lower, which is conducive to reducing production costs.