Thermodynamic properties of the azeotropic mixture of acetone and methanol

The molar heat capacities of the pure samples of acetone and methanol, and the azeotropic mixture composed of acetone and methanol were measured with an adiabatic calorimeter in the temperature range 78–320 K. The solid–solid and solid–liquid phase transitions of the pure samples and the mixture were determined based on the curve of the heat capacity with respect to temperature. The phase transitions took place at 126.16±0.68 and 178.96±1.47 K for the sample of acetone, 157.79±0.95 and 175.93±0.95 K for methanol, which were corresponding to the solid–solid and the solid–liquid phase transitions of the acetone and the methanol, respectively. And the phase transitions occurred at 126.58±0.24, 157.16±0.42, 175.50±0.46 and 179.74±0.89 K corresponding to the solid–solid and the solid–liquid phase transitions of the acetone and the methanol in the mixture, respectively. The thermodynamic functions and the excess thermodynamic functions of the mixture relative to standard temperature 298.15 K were derived based on the relationships of the thermodynamic functions and the function of the measured heat capacity with respect to temperature.     

两种3D微孔Zn-MOF对水溶液中Fe3+、Cr2O72-和丙酮分子的荧光传感(英文)

通过溶剂热法合成了2种三维微孔锌金属有机框架材料,其分子式为[Zn₃(DBA)(OH)(1,10-phen)₂]_n (1)和{[Zn₂(HDBA)(4,4′-bipy)_1.5]·H₂O}_n (2)(H₅DBA=3,5-二(2′,4′-对羧基苯基)苯甲酸;1,10-phen=1,10-菲咯啉;4,4′-bipy=4,4′-联吡啶)。结构分析表明,配合物1为三核锌基金属单元的三维微孔骨架,配合物2为双核锌基的微孔结构。与2相比,配合物1在水中具有较强的发光性能,可作为检测Fe³⁺、Cr₂O₇^2-和丙酮分子的发光传感器,具有较高的选择性和灵敏度。     

Excellent acetone sensing properties of porous ZnO

Porous Zn O was obtained by hydrothermal method.The results of scanning electron microscope revealed the porous structure in the as-prepared materials.The acetone sensing test results of porous Zn O show that porous Zn O possesses excellent acetone gas sensing properties.The response is 35.5 at the optimum operating temperature of 320?C to 100 ppm acetone.The response and recovery times to 50 ppm acetone are 2 s and 8 s,respectively.The lowest detecting limit to acetone is 0.25 ppm,and the response value is 3.8.Moreover,the sensors also exhibit excellent selectivity and long-time stability to acetone.     

叶绿素丙酮溶液中热致暗空间光孤子实验

设计了热致暗空间光孤子的实验光路和偶边界条件的实施方案，在叶绿素丙酮溶液中实现了热致暗空间光孤子实验，并采用分步傅里叶变换法进行了数值模拟，发现两者的结果一致。     

脱水催化剂的改性对浆态床一步法合成二甲醚的影响

 以Cu(NO3)2为前驱体,以水、丙酮或乙二醇为溶剂,以γ-Al2O3为载体,采用等体积浸渍法制备了用于合成气一步法制二甲醚的脱水-变换双功能催化剂,并对其还原性能、晶态分布、还原态的酸性及催化性能进行了研究. H2-TPR结果表明,以乙二醇为溶剂制备的催化剂上可还原氧化铜的量最多. XRD结果表明,以水为溶剂制备的催化剂上,氧化铜并未完全均匀地分散在氧化铝表面,而是有一部分以单质铜或铜铝化合物的形式存在; 而以丙酮或乙二醇为溶剂制备催化剂时,氧化铜分布均匀. 还原态催化剂NH3-TPD结果表明,以乙二醇为溶剂制备的催化剂上,酸性中心主要集中在弱酸位上. 浆态床搅拌釜中合成反应的结果表明,用氧化铜对脱水催化剂进行改性,能改善催化剂的催化性能,提高CO转化率和产物中二甲醚的选择性,抑制副反应的发生. 非水溶剂的使用对CO转化率没有明显的影响,但可改变催化剂上酸中心的分布,提高二甲醚的选择性,并抑制副反应的发生.     

Synthesis and Crystal Structure of H_2Mo_8O_(26)〔(n-Bu)_4N_2〔(CH_3)_2 COHCH_2COCH_3〕_2

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Reaction of 1,3-Dioxanes with Acetone Cyanohydrin

The reaction of 4-phenyl- and 4,4-dimethyl-1,3-dioxanes with acetone cyanohydrin leads to hydrolytically unstable 2-(1-hydroxy-1-methylethyl)-5,6-dihydro-1,3-oxazines, which are readily saponified in alkaline medium to the corresponding 1,3-amino alcohols.     

杂多化合物膜催化异丁烯选择氧化反应

 以多孔钛片为支撑体,将组成为HxCu1．2PAs0．6Mo12Oy的杂多化合物与具有氧溢流效应的氧化物Sb2O4制成催化膜,在特制的膜催化反应器中进行异丁烯选择氧化反应．结果表明,杂多化合物－Sb2O4催化膜具有较高的催化活性;在适宜的条件下,甲基丙烯酸收率可达26.3％,甲基丙烯醛收率可达22.4％,液体产物（即可用产物,包括甲基丙烯酸、甲基丙烯醛、乙酸和丙酮）收率可达67.4％．     

Theoretical study on the vibrational state distribution of product CO in the photolysis of acetoneCH_3 COCH_3 \underrightarrow {hv}2CH_3 + CO

The photolysis of acetone has been studied at 6-311G basis set using unrestricted Hartree-Fock method. The results show that ground state acetone (S_o) cannot easily dissociate. The electrons of acetone undergo n→II transition in laser, and excited acetone (T₁) can easily dissociate: and acetyl can further undergo themolytic dissociation: CH₃CO→CH₃+CO(R₂). The dynamic information (ω_k B _KF V₀(S)) of reaction R₂ is obtained and the vibrational state distributions of product CO are calculated. The calculated value consists with the experimental value. Project supported by the National Natural Science Foundation of China (Grant No. 29773007).