The direct electrolytic oxidation of p-tert-butyl toluene in a mixture of sodium fluoborate, acetic acid and methanol using carbon rod as electrode has been studied. The main electrolytic oxidation products, p-tert-bu...The direct electrolytic oxidation of p-tert-butyl toluene in a mixture of sodium fluoborate, acetic acid and methanol using carbon rod as electrode has been studied. The main electrolytic oxidation products, p-tert-butylbenzaldehyde, p-tert-butylbenzyl methyl ether, p-tert-butyl benzaldehyde dimethyl acetal, and methyl p-tert-butylbenzoate were separated and identified by GC/MS. The relation between the oxidation pro- duct and the oxidation time in electrolytic oxidation was examined. The total yield of p-tert-butylbenzaldehyde and p-tert-butyl benzaldehyde dimethyl acetal was over 88% in period of 30 h oxidation.展开更多
采用高活性非均相催化剂,以氧气为氧化剂,进行对叔丁基苯甲醛催化氧化合成。考察各因素对反应的影响,确定了较佳的工艺参数:对叔丁基甲苯1.0 g,乙腈15 m L,催化剂0.15 g,反应温度60℃,反应时间7 h,氧气通入量2 m L/min,N-羟基邻苯二甲...采用高活性非均相催化剂,以氧气为氧化剂,进行对叔丁基苯甲醛催化氧化合成。考察各因素对反应的影响,确定了较佳的工艺参数:对叔丁基甲苯1.0 g,乙腈15 m L,催化剂0.15 g,反应温度60℃,反应时间7 h,氧气通入量2 m L/min,N-羟基邻苯二甲酰亚胺0.06 g,对叔丁基苯甲醛收率达38%以上。该工艺可实现固定床连续化生产,废物排放少,绿色环保,具有良好的应用前景。展开更多
采用NaOH和NaAlO2溶液相结合的处理方法对Hβ沸石进行脱硅补铝处理,制备了一系列不同硅/铝比的Hβ沸石催化剂。采用ICP、XRD、NH3-TPD、FT-IR和27Al MAS NMR等手段,对几种补铝Hβ沸石催化剂的物化性质进行了表征,并在100 ml间歇式不锈...采用NaOH和NaAlO2溶液相结合的处理方法对Hβ沸石进行脱硅补铝处理,制备了一系列不同硅/铝比的Hβ沸石催化剂。采用ICP、XRD、NH3-TPD、FT-IR和27Al MAS NMR等手段,对几种补铝Hβ沸石催化剂的物化性质进行了表征,并在100 ml间歇式不锈钢高压反应釜中考察了其在甲苯与叔丁醇烷基化反应中的催化性能。结果表明,铝原子可以有效地进入Hβ沸石骨架;随着NaAlO2浓度的增加,Hβ沸石的硅/铝比下降,相对结晶度下降,催化剂酸强度呈下降趋势;当NaAlO2浓度为0.15 mol/l时,制备的Hβ3沸石的酸量最大,其对应的催化活性最好。采用Hβ3作为催化剂,研究了各种反应条件对催化剂性能的影响。实验结果发现,在适宜的反应条件下,即反应温度180℃、反应时间4 h、叔丁醇/甲苯摩尔比为4、甲苯/催化剂质量比为5,甲苯的转化率49.6%,对叔丁基甲苯的选择性72.9%。催化剂的再生能力良好,重复使用4次后,甲苯转化率仍达到41.0%。展开更多
文摘The direct electrolytic oxidation of p-tert-butyl toluene in a mixture of sodium fluoborate, acetic acid and methanol using carbon rod as electrode has been studied. The main electrolytic oxidation products, p-tert-butylbenzaldehyde, p-tert-butylbenzyl methyl ether, p-tert-butyl benzaldehyde dimethyl acetal, and methyl p-tert-butylbenzoate were separated and identified by GC/MS. The relation between the oxidation pro- duct and the oxidation time in electrolytic oxidation was examined. The total yield of p-tert-butylbenzaldehyde and p-tert-butyl benzaldehyde dimethyl acetal was over 88% in period of 30 h oxidation.
文摘采用高活性非均相催化剂,以氧气为氧化剂,进行对叔丁基苯甲醛催化氧化合成。考察各因素对反应的影响,确定了较佳的工艺参数:对叔丁基甲苯1.0 g,乙腈15 m L,催化剂0.15 g,反应温度60℃,反应时间7 h,氧气通入量2 m L/min,N-羟基邻苯二甲酰亚胺0.06 g,对叔丁基苯甲醛收率达38%以上。该工艺可实现固定床连续化生产,废物排放少,绿色环保,具有良好的应用前景。
