Use of ionic liquids in recycle of palladium catalysts for synthesis of polyketone

Room temperature ionic liquids as solvents for palladium-catalyzed copolymerization of carbon monoxide and styrene were prepared by reaction of aqueous lead tetrafluoroborate with correspond-ing chloride or bromide salts. The recyclability of palladium composite catalyst in various ionic liquids was investigated.[Pd(bipy)2][BF4]2 showed a lower catalytic activity than [Pd(bipy)2][PF6]2 in similar conditions, although the catalytic activity of each composite catalyst in ionic liquids still existed after 4 successive recycles. It was shown the catalytic activity of palladium composite catalyst was higher than that of the catalyst formed in situ from palladium acetate, 2,2'-bipyridyl, and HA (A=PF6-, BF4-) in ionic liquids. The effects of volume of ionic liquids, reaction time, and the dosage of benzoquinone on the copolymerization were also studied.     

废加氢催化剂脱油处理方法的研究

利用表面活性剂的渗透功能,研究了一种方便快捷、成本低廉的方法来处理工业加氢催化剂废弃物,处理效果显著,废加氢催化剂洗涤效率可达72.9%,含油量由原来的17.4%降低至2.8%,实现了脱油的目的。并摸索出最佳工艺条件为:表面活性剂质量分数3%、氯化钠1%、氢氧化钠3%、油/水体积比为1:2、加热温度80±2℃、超声波作用下搅拌反应2h。     

磁性固体酸催化合成丁酸苄酯的研究

磁性固体酸催化合成丁酸苄酯,通过正交实验得出其最佳合成条件为：丁酸0．1mol时,苄醇0．15mol,磁性固体酸1．5g,带水剂（甲苯）10mL,反应时间1．5h,其酯化率达96．1％以上;同时利用催化剂的磁性可将催化剂迅速分离回收,并能重复使用．     

复合固体超强酸SO4^2-／ZrO2-Ce2O3的制备及催化合成丁酸异戊酯的研究

合成了复合固体超强酸SO4^2-／ZrO2-Ce2O3,研究了Ce2O3的最佳添加量,并将其应用于催化合成丁酸异戊酯的反应,探索到了最佳反应条件．Ce2O3的最佳添加量为2．0％,最佳反应条件为0．10mol丁酸使用1．0g复合固体超强酸催化剂,醇酸摩尔比2．0,反应时间为2．5h,丁酸的酯化率可达96％以上,并且不污染环境．     

几种稀土固体超强酸催化合成异戊酸异戊酯的研究

采用稀土元素对SO2-4／TiO2固体超强酸的改性，制备出一系列稀土固体超强酸催化剂，用于合成异戊酸异戊酯的反应中，筛选出最佳催化剂为：SO2-4／TiO2/Sm^3 ，并研究了SO2-4／TiO2/Sm^3 的再生及合成异戊酸异戊酯的催化性能。     

微波辐射相转移催化合成对羟基苯甲酸杉酯的研究

以对羟基苯甲酸和氯化苄等为原料,以十六烷基溴化铵为相转移催化剂合成对羟基苯甲酸苄酯。通过实验考察了催化剂用量及物料配比等因素对酯化反应的影响。结果表明:微波辐射功率350W,辐射时间3min,n(对羟基苯甲酸)∶n(氯化苄)=1∶2,n(正十六烷基三甲基溴化铵)∶n(对羟基苯甲酸)=0.025,产率可达96.7%。     

Recovery of Dilute Acetic Acid by Catalytic Distillation Using NKC-9 as Catalyst

The reaction kinetics of dilute acetic acid with methanol using NKC-9 as catalyst was studied at temperatures of 308 K, 318 K, 323 K, 328 K. The kinetic model based on Langmuir-Hinshel-wood rate model was derived and the activation energy was 6.13×104 kJ/kmol. The experiment of recovery of dilute acetic acid was conducted in a packed bed catalytic distillation column. The optimal process parameters and operational conditions determined to make up to 85.9% conversion of acetic acid are as follows:the height of catalyst bed is 1 100 mm, reflux ratio is 4:1, and the ratio of methanol to acetic acid is 2:1. The method can be used as a guide in industrial scale recovery of 15%-30% dilute acetic acid.     

高分子催化剂研究进展

以高分子催化剂的组成、性能及制备等为线索介绍了近些年来高分子催化剂的研究进展情况.对高分子负载络合催化剂、可溶性金属络合物催化剂、高分子保护催化剂、模板聚合物催化剂以及稀土、相分离催化剂等作了较为全面的概括论述.     

固体酸催化环己醇脱水制备环己烯

评述了对甲苯磺酸、五水四氯化锡、二水氯化亚锡、六水三氯化铁、一水合硫酸氢钠、Ti4+-阳离子交换树脂、固体超强酸、杂多酸和沸石分子筛催化环己醇脱水制备环己烯的方法,并指出固体超强酸、杂多酸和沸石分子筛是环己醇脱水制备环己烯的优良催化剂.     

酸催化丙烯醛水合规律的研究

以磷酸、硫酸及磷酸-三乙胺缓冲溶液为催化剂进行丙烯醛水合反应,考察了温度、时间、酸度、不同类型酸等因素对水合收率的影响。在间歇反应器中,当温度为70℃,时间为3h时,催化水合效果较好,结果表明催化效果与体系酸度成正比,H 的来源与催化活性无关,同时研究发现以缓冲溶液为催化剂效果要优于单酸催化。