Higher School of Industrial Technologies, Department of Second Cycle, P.O. Box 218, 23000 Annaba, Algeria.
Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, 11421 Riyadh, Saudi Arabia.
Ultrason Sonochem. 2021 May;73:105469. doi: 10.1016/j.ultsonch.2021.105469. Epub 2021 Jan 22.
The present paper reports a numerical investigation of the feasibility of a hybrid concept associating the 1-Butyl-3-methylimidazolium Acetate [Cmim][CHCOO] to sonication, in terms of cavitation formation and generated extreme conditions allowing cellulose decomposition in the second reactivity site. The results of the proposed model revealed an acoustic power threshold of 1.8 atm, in order to expect a transient cavitation in the ionic liquid, leading to harsh conditions of 1559.8 K and 49 bar within the bulk volume of the acoustic cavitation bubble. The spatial and temporal variation of the temperature was simulated within the bulk volume of the bubble as well as in the thermal boundary layer jointly with the chemical kinetics. The first stage of the polymerization reduction was clearly attained and demonstrated through the decomposition rate of cellulose and the molar rate of emergence of anhydrocellulose, reaching the respective orders of magnitude of 1.71 × 10 mol/m⋅s and 7.91 × 10 mol/m⋅s.
本文报道了一种将 1-丁基-3-甲基咪唑醋酸盐 [Cmim][CHCOO]与超声结合的混合概念的可行性的数值研究，就空化形成和生成允许纤维素在第二反应部位分解的极端条件而言。所提出模型的结果表明，声功率阈值为 1.8 atm，以期望在离子液体中产生瞬态空化，从而在声空化泡的体相内产生 1559.8 K 和 49 bar 的苛刻条件。在气泡体相内以及热边界层内模拟了温度的时空变化，并结合了化学动力学。通过纤维素的分解速率和无水纤维素出现的摩尔速率，明显达到并证明了聚合还原的第一阶段，分别达到了 1.71×10 mol/m⋅s 和 7.91×10 mol/m⋅s 的数量级。
