山梨酸正丁酯的合成研究

以山梨酸与正丁醇为原料,对甲苯磺酸为催化剂合成了山梨酸正丁酯,用乙酸丁酯作带水剂,4A分子筛作除水剂,酯化收率可达97.5%.     

Simulation of partial oxidation of natural gas to synthesis gas using ASPEN PLUS

Conversion of natural gas to liquid fuels is a challenging issue. In SMDS process natural gas is first partially oxidized with pure oxygen to synthesis gas (a mixture of H₂ and CO) which is then converted to high quality liquid transportation fuels by utilizing a modernized version of the Fischer-Tropsch reaction. This paper presents a computer simulation of the first stage of the process, i.e. the synthesis gas production from natural gas. ASPEN PLUS equipped with a combustion databank was used for calculations. Concentrations of over 30 combustion species and radicals expected in the synthesis gas have been calculated at equilibrium and several non-equilibrium conditions. Using a sensitivity analysis tool, the relative feed flow rates and reactor parameters have been varied searching to maximize the CO/O₂ yield as well as to minimize the undesired nitrogen compounds in the product stream. The optimum reactor temperature for maximizing the CO mole fraction in the synthesis gas was also calculated.     

Ca_(0.6)Mg_(0.4)Zr_4(PO_4)_6低膨胀陶瓷的制备与烧结

采用分步沉淀法合成了Ca_(0.6)Mg_(o.4)Zr_4(PO_4)_6单相粉体。CMZP陶瓷的烧结主要取决于温度和烧结助剂,最大密度达到理论值的98％,借助SEM观察了表面及断口形貌,EDX作元素的半定量分析在1300℃试样表面发生了分解。     

水热法合成(Mn,Zn)Fe_2O_4磁性晶体粉末

采用水热加工技术研究（Ｍｎ，Ｚｎ）Ｆｅ２Ｏ４晶体粉末的合成条件，对水热体系的碱度、温度、时间进行了系统实验．结果表明在ｐＨ＝７～１２．５范围内可有效合成（Ｍｎ，Ｚｎ）Ｆｅ２Ｏ４．当温度在１９０～２２０℃时，完成合成所需的时间为１～２ｈ，提高碱度有利于合成反应．本文还初步探讨了（Ｍｎ，Ｚｎ）Ｆｅ２Ｏ４的合成机理，为扩大实验提供依据．     

新型无污染融雪/冰剂的合成及应用评价

以天然矿石和乙酸为原料 ,采用正交试验法进行了新型无污染融雪 /冰剂的合成工艺研究 ,确定最适宜工艺条件为 :矿石与乙酸溶液的质量比为 1.2 ,乙酸浓度为 2 .6mol/L ,反应温度为 80℃ ,反应时间为 4～ 6h。介绍了新型融雪 /冰剂的机理、效果、对环境的影响 ,以及腐蚀性与毒性     

Removal of mineral material from solvent-refined coal by solvent extractions

Solvent refined coal (SRC), a coal extract which is highly polyaromatic in character and relatively high in N, O and S content, is derived from the direct liquefaction of coal. SRC contains mineral matter in the form of soluble organometallic compounds which can not be removed by filtration. These soluble species can be detrimental to the hydrocracking catalyst used in the upgrading of the SRC to high-value liquid fuels. These species, however, can be separated from the SRC by extraction with benzene or tetralin as solvents so that the mineral matter is mainly concentrated in the solvent-insoluble fraction, the other fraction are then readily hydrocracked, as demonstrated in this work.     

2-乙氧基丙烯的合成

介绍了2-乙氧基丙烯(EPP)的用途及合成方法，采用自制催化剂由2，2-二乙氧基丙烷(DEP)合成2-乙氧基丙烯．总收率达到84．5％。     

2-苯基-1,2-苯并异硒唑-3-(2H)-酮的合成研究

在N2保护下,采用水合肼的碱性水溶液还原硒粉制备了K2Se2,不经分离直接与邻氨基苯甲酸的重氮盐反应得到了中间体2,2'-二硒化苯甲酸;在环合反应合成2-苯基-1,2-苯并异硒唑-3-(2H)-酮(Ebselen)时改用了乙醚-水为反应体系,K2CO3水溶液作为副产物HCl的吸收剂,促使胺解关环反应顺利进行,产物易分离、纯化得2-苯基-1,2-苯并异硒唑-3-(2H)-酮。     

4,4'-二氨基二苯醚的合成与应用

本文介绍了4,4'-二氨基二苯醚(ODA)几种合成方法,并作适当比较,并简要介绍了其在化学工业合成中的应用。     

Synthesis, characterization of bimetallic Sn-Zn-MCM41 and its catalytic performance in the hydroxylation of phenol

A series of Sn-Zn modified-MCM41 has been synthesized by direct hydrothermal method and characterized using ICP, XRD, TG/DTA, FT-IR, HRTEM and N_2-adsorption techniques. Catalytic performances of the obtained materials were evaluated in the hydroxylation of phenol with H₂O₂. Results indicated that all the samples exhibited typical hexagonal arrangement of mesoporous structure with high surface area and the heteroatoms were probably incorporated into the framework of MCM41. Catalytic tests revealed that the bimetallic incorporated materials were effective catalysts in the hydroxylation of phenol. The conversion of phenol could be reach to 56.8% for the catalysts with Sn: Zn: Si = 2.69: 4.57: 100 (molar ratio) under the optimized reaction conditions. Moreover, the materials containing Sn and Zn exhibited higher catalytic activity than monometallic Sn and Zn modified MCM41.