钨酸

In the absence of organic solvent and phase-transfer catalyst, the catalytic oxidation of cyclohexene to adipic acid with aqueous 30% hydrogen peroxide by weight can be efficiently catalyzed by tungstenic acid /inorganic acidic ligand.

以钨酸／无机酸性配体为催化体系，在无有机溶剂和相转移剂的情况下，催化过氧化氢(质量分数30％)氧化环己烯合成己二酸。

Cyclohexene ; adipic acid ; tungstenic acid ; inorganic acid ; catalytic oxidation

环己烯；己二酸；钨酸；无机酸；催化氧化

Hydrogen peroxide(H_2O_2)was used as oxidant,oxalic acid as complexing agent and tungstic acid (H_2WO_4)as catalyst.

研究了以环戊烯为原料、草酸为有机络合剂、H2O2为氧化剂，在催化剂钨酸(H2WO4)的作用下一步合成戊二酸的绿色新过程，考察了氧化剂的含量、反应物配比、催化剂用量、反应温度、反应时间等对反应的影响。

A set of high pressure esterification reaction apparatus has been designed and established. By comparison of ten kinds of esterification catalyst, ammonium molybdate and sodium tungstate were chosen as properly catalyst of this reaction.

自行设计、安装了一套高压酯化反应装置，经比较、筛选十种酯化反应催化剂，确定钼酸铵、钨酸钠为该反应适宜的催化剂。

D. aimed at synthesizing luminescent materials of phosphates, tungstates, aluminates and other related materials in a hydrothermal and a solvotherml system.

我们在水热体系中合成了磷酸盐类，钨酸盐类，铝酸盐类及相关发光材料。

With the improvement of Si/Al ratio, total BET surface area decreased and mesopore volume increased, which favored the diffusion of feed/isomerized products, avoided too much secondary reaction and improved the selectivity of isomers.

磷钨酸可以使得分子筛的孔道阻塞，使其内部的酸中心和金属中心无法得到体现，因此，催化剂的金属功能受到限制，烷烃的氢解反应减少，产物中的甲烷和庚烷量下降。

Synergistic effect was observed when these inhibitors compounded with sodium molybdate, sodium tungstate and azimino-benzene, respectively.

这3种缓蚀剂分别与钼酸钠、钨酸钠、苯并三唑复配后的缓蚀效果均好于单独使用缓蚀剂时的效果。

Sodium tungstate ; cyclohexene ; catalytic oxidation ; adipic acid ; acidic ligand ; reaction kinetics

钨酸钠；环己烯；催化氧化；己二酸；酸性配体；反应动力学

It was found from orthogonal experiment that the recombination of sodium benzoate, ammonium benzoate, cinnamic acid and sodium tungstate had good synergistic reaction. Based on the orthogonal experiment, a kind of new prescription of vapor phase corrosion inhibitor for DI material is found, which is not only high effective but also friendly to environment.

通过正交试验发现：苯甲酸钠、苯甲酸铵、肉桂酸与钨酸钠的复配使用，表现出很好的协同作用，从而得到了一种新的环保、高效的用於DI材的气相缓蚀剂配方。

The results indicate that sodium benzoate, ammonium benzoate, cinnamic acid inhibited anodic process significantly. Pure sodium tungstate was less effective.

结果表明：苯甲酸钠、苯甲酸铵、肉桂酸对DI材的阳极过程有明显的抑制作用；单纯的钨酸钠对DI材的缓蚀效果不佳。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。