Dissertation > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aromatic compounds > Aromatic aldehydes,aromatic ketones and their derivatives,quinones and their derivatives > Aromatic aldehydes and their derivatives

Preparation of Benzaldehyde by Micelle-catalytic Hydrolysis of Cinnamon Oil

Author PengBo
Tutor ChenLiangTan
School Xiamen University
Course Physical and chemical
Keywords Cinnamon oil Natural Benzaldehyde Micellar catalysis Thermokinetic
CLC TQ244.1
Type Master's thesis
Year 2007
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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 mol · L -1 , 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 .

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