Kinetic modelling of Prileschajew epoxidation of oleic acid under conventional heating and microwave irradiation
Kinetic modelling of Prileschajew epoxidation of oleic acid under conventional heating and microwave irradiation
复制标题
DOI：
10.1016/j.ces.2019.01.035
复制
发表时间：
2019-05-18
影响因子：
4.7
通讯作者：
Salmi, Tapio
中科院分区：
文献类型：
--
作者：
Aguilera, Adriana Freites;Tolvanen, Pasi;Salmi, Tapio
在常规加热和微波辐射下，在循环反应器系统中研究了过乙酸（PAA）对油酸的环氧化反应。该反应系统由几个步骤组成。因此，通过研究每个反应步骤：PAA 合成和分解、环氧化和开环，开发了一种减少待估计参数数量的动力学建模策略。微波加热的能量平衡与微波吸收物质的浓度和微波的总输入功率相关。环氧化反应在剧烈搅拌釜反应器中在50-70℃的温度范围内等温条件下进行。有机相含量为32-45％v/v。界面传质被认为比抑制传质相关性使用的固有反应动力学更快。使用非线性回归来估计动力学参数。分别针对微波和传统加热开发了两种模型。过水解反应是最慢的反应，其次是环氧化和开环。微波辐射的使用导致了环氧化过程的相当大的过程强化。通过采用微波加热，水相中的过水解步骤得到增强，并且在最佳情况下反应时间减少了 50%，这意味着微波技术可以减小反应器尺寸。 (C) 2019 Elsevier Ltd. 保留所有权利。
Epoxidation of oleic acid by peracetic acid (PAA) was studied in a recycled reactor system under conventional heating and microwave irradiation. This reaction system consists of several steps. Thus, a kinetic modelling strategy to diminish the number of parameters to be estimated was developed by investigating each reaction step: PAA synthesis and decomposition, epoxidation and ring-opening. The energy balance for microwave heating was correlated with the concentration of the microwave-absorbent species and the total input power of the microwaves. The epoxidation reaction was conducted in the vigorously stirred tank reactor under isothermal conditions within a temperature range of 50-70 degrees C. The organic phase content was 32-45% v/v. The interfacial mass transfer was supposed to be faster than the intrinsic reaction kinetics suppressing the use of mass transfer correlations. Nonlinear regression was used to estimate the kinetic parameters. Two models were developed for microwave and conventional heating respectively. The perhydrolysis showed to be the slowest reaction, followed by the epoxidation and the ring-opening. The use of microwave irradiation resulted in considerable process intensification for the epoxidation process. By employing microwave heating, the perhydrolysis step in the aqueous phase was enhanced, and the reaction time was reduced by 50% in best cases, which implies that the reactor size can be diminished by microwave technology. (C) 2019 Elsevier Ltd. All rights reserved.