微通道反应器中环己烷液相氧化反应工艺的研究  

Liquid-Phase Oxidation of Cyclohexane in a Microchannel Reactor

作　　者：余锡孟[1,2] 沈忠权 杜锡勇 陈纪忠 

机构地区：[1]浙江省化工高效制造技术重点实验室,浙江大学化学工程与生物工程学院,浙江杭州310027 [2]绍兴市质量技术监督检测院,浙江绍兴312366 [3]嘉兴学院生物与化学工程学院,浙江嘉兴314001

出　　处：《高校化学工程学报》2017年第6期1372-1378,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：浙江省先进催化技术创新团队基金(2009R50020)

摘　　要：以纯氧为氧化剂、环己酮为引发剂和环烷酸钴(II)为催化剂,研究了内径为0.762 mm、长度为20 m的微通道反应器内环己烷液相氧化的反应行为,考察了表观气体流速、表观液体流速、反应温度、压力和催化剂用量等因素对环己烷转化率和产物选择性的影响。在氧气和环己烷表观流速分别为1.80 m?s-1和0.004 m?s-1、温度165℃、压力1.4 MPa、环己酮加入量0.2%(wt)和催化剂钴(II)浓度为10 ppm时,环己烷的转化率为4.57%,环己醇、环己酮和环己基过氧化氢的选择性分别为61.72%、34.87%和1.12%,己二酸的选择性小于3.0%。结果表明,微通道反应器中进行环己烷液相催化氧化,能有效提高气液相界面积,加快环己烷氧化反应速率,降低副产物的生成。Liquid-phase oxidation of cyclohexane by oxygen was studied using cobalt naphthenate （II） as the catalyst and cyclohexanone as the initiator in a stainless steel microchannel reactor （inside diameter, 0.762 mm and length, 20 m）. Effects of superficial gas velocity, superficial liquid velocity, reaction temperature, pressure and catalyst concentration were observed. Under conditions of superficial oxygen velocity = 1.80 m.s-1, cyclohexane velocity = 0.004 m-s-1, reaction temperature = 165~C, pressure = 1.4 MPa, mass fraction of cyclohexanone = 0.2%（wt） and catalyst concentration = 10 ppm, results of cyclohexane conversion = 4.57%, cyclohexanol, cyclohexanone and cyclohexyl hydroperoxide selectivity = 61.72%, 34.87% and 1.12%, respectively, and adipic acid 〈 3.0% were obtained. The experimental results show that a microchannel reactor can improve gas-liquid mass transfer and is feasible for liquid-phase catalytic oxidation of cyclohexane by oxygen with less byproducts.

关 键 词：环己烷 液相氧化 微通道反应器 纯氧 

分 类 号：TQ342.1[化学工程—化纤工业]