Study on Ni/C catalysts for vapor phase carbonylation of ethanol

激活支持碳的 Ni 催化剂让乙醇的蒸汽阶段 carbonylation 当倡导者被调查，面对乙醇碘化物支撑离子的酸。在最佳反应条件下面，当时，碳一氧化物和乙醇的变换被测量分别地，是 81.4% 和 98.4% 选择为支撑离子的酸被发现是 98.65% 。催化剂在溪流上的 48 h 以内是稳定的。XRD 和 XPS 方法被用来描绘结构和新鲜、测试的催化剂的表面性质。描述结果显示镍粒子和催化剂表面上的镍碘化物的形成的聚集应该为催化剂的释放负责。

Isobaric vapor–liquid equilibrium for binary system of aniline+methyl-N-phenyl carbamate

In this study,the quasi-static ebulliometric method was used to measure both of the vapor pressures of methyl N-phenyl carbamate(MPC),and the isobaric vapor–liquid equilibrium(VLE) data of the aniline and MPC binary system.The measured vapor pressure data of MPC,at different temperature ranging from 369.60 to 389.54 K,fitted well with the Antoine equation.The VLE data for the aniline and MPC system at(2.00,4.00,6.00,7.00 and 8.00) k Pa were correlated by both of nonrandom two-liquid(NRTL) and Wilson models.The parameters of the two models were obtained by regressing the experimental data,with the absolute temperature deviations of 0.54 K and 0.53 K,respectively.The relative volatility of the binary system calculated was all far more than 1,which gives the conclusion that the high purity MPC can be separated from aniline and MPC binary system by rectification or distillation technology.

Molecular Weight and Distribution of Cellulose and Cellulose Microspheres

[ Objective ] This study aimed to provide basic data for studying the relationship between structure and property of cellulose microspheres by measuring molecular weight of cellulose and cellulose microspheres with viscosity method and gel permeation chromatography （GPC） method. [ Method] In viscosity method, cadmium ethylenediamine was used as the solvent, intrinsic viscosity η of the solution was determined at 25 ℃ by using a Ubbelohde viscometer, to calculate the molecular weight of cellulose; in GPC method, 8% LiC1 / N, N-dimethylacetamide （LiC1/DMAc） was used as the solvent and 0.5% LiC1/DMAc was used as the mobile phase to determine the relative molecular weight and distribution of cellulose and cellulose microspheres. In addition, the determination results were analyzed to compare these two methods. [ Result ] Viscosity-average molecular weight Mr/ of cellulose and cellulose microspheres determined with viscosity method were 224,532 and 16,686, respectively; weight-average molecular weight Mw of cellulose and cellulose microspheres determined with GPC method were 284,196 and 22,345, respectively. [ Conclusion] The determination results of （;PC method are relatively close to the actual value and could truly reflect the characteristics of molecular weialat distribution of eellulose and cellulose mierosr, heres.

茶树茎段不定芽高效发生体系的建立

茶树(Camellia sinensis)是重要的经济作物,杂合度高且变异度大,其高效离体再生体系鲜见报道。以舒茶早茎段为起始外植体,进行不定芽高效发生影响因子研究。结果表明,MS+2 mg·L^(-1)6-BA为定芽诱导的最适配方,定芽诱导率为84.44%,吸收底盘膨大率为80%,利于后续不定芽诱导;MS+2 mg·L^(-1)6-BA+0.2 mg·L^(-1)NAA+0.1 mg·L^(-1)KT+1 mg·L^(-1)脯氨酸为不定芽增殖诱导的适宜配方,不定芽诱导率为88.89%,平均芽数为7.8。不定根诱导的适宜配方为1/2MS+3 mg·L^(-1)IBA,生根率为85.56%。采用RAPD和ISSR技术对再生植株进行分子检测,在连续2代离体再生植株中未发现明显变异。

己二胺与碳酸二乙酯催化羰化合成己二氨基甲酸酯

以碳酸二乙酯(DEC)、1,6-己二胺(HDA)为原料、无水醋酸锰为催化剂,合成了1,6-六亚甲基二氨基甲酸乙酯(HDEC)。通过红外光谱、核磁共振氢谱、气相色谱确定HDEC标样的结构和纯度,并建立了定量分析方法。进一步采用气质联用对反应的主副产物进行定性分析,推测反应路径。同时,对合成工艺进行反应参数优化,并推测反应机理。结果表明,该反应通过两步实现,首先HDA与DEC反应生成单取代的1-(6-氨基)-六亚甲基单氨基甲酸乙酯(HMEC)中间体,HMEC进一步与DEC羰化反应生成HDEC目标产物,同时反应过程中DEC与HDA以及HMEC反应生成脲类副产物。在最佳反应条件原料DEC与HDA摩尔比为3.5:1、反应温度120℃、无水醋酸锰催化剂用量为HAD初始用量的15%、反应时间5 h、转速400 r/min下,HDA转化率为100%,HDEC收率达89.6%。本研究为非光气法合成六亚甲基二异氰酸酯(HDI)重要中间体HDEC提供理论借鉴。