Preparation of Benzaldehyde by Micelle-catalytic Hydrolysis of Cinnamon Oil
|Course||Physical and chemical|
|Keywords||Cinnamon oil Natural Benzaldehyde Micellar catalysis Thermokinetic|
Benzaldehyde as the main raw material of the spices in food and beverage , widely used in food , beverage , health care products , pharmaceutical and other industries . Due to the need of safe and delicious food additives to a higher demand for natural degree of benzaldehyde . Traditional production methods for the production of raw materials containing amygdalin nuts benzaldehyde , due to the removal of hydrocyanic acid process demanding more processes , coupled with limited sources of raw materials , high cost of production , greatly limiting their food industrial applications . This requires looking for a production of natural benzaldehyde replaced by the natural product pathways . Practice has proved that the natural cinnamon oil rich in cinnamic aldehyde under alkaline conditions , hydrolysis of natural benzaldehyde in the process is feasible , but the yield is not high , the reaction conditions are difficult to control . The laboratory selection of this reaction has a characteristic of micellar catalysis cationic surfactant cetyltrimethylammonium bromide (CTAB), and triethanolamine instead of part of sodium carbonate . Meanwhile, the control of certain speed slow dropwise cinnamon oil, and after a certain time of the reaction , side reactions edge new process for fractionation product . Laboratory cinnamic aldehyde hydrolysis reaction , reaction temperature, reaction time, pH, and selection of different surface active agents of the impact of each of the reaction conditions . The results show that the new process with increased reaction rate, reduce side effects , and improve the yield of the obvious advantages . When the reaction temperature is 368K ~ 375K, selection of sodium carbonate and mixed alkali of triethanolamine as the pH was adjusted = 10 m ( cinnamic aldehyde ) : m ( water ) = 1:4 , C ( CTAB ) = 2.03 * 10 -3 sup> mol · L -1 sup>, reaction time 14h , benzaldehyde yield up to 61% . Microcalorimetric method to study the catalytic effect of sodium dodecyl sulfate and cetyl trimethyl ammonium bromide micelles on the alkaline hydrolysis of natural cinnamon oil . To a calorimetry data processing , laboratory that the thermal spectrum curve of peak height values ??need to be corrected before substituting calculated and seek to forget the reaction rate constant and the activation energy . Investigated changes in the nature of the surface charge by the Zeta potential measurement . The experimental results show that , CTAB not only have the effect of reducing the surface tension of the solution , on the OH- at the same time there is a strong enrichment . Finally, this paper also proposed reaction mechanism more in line with the experimental results .