查询词典 zinc blende

Different from many other researches the Henkel-Esterification process was studied here which starts from 1,8-naphthalenedicarboanhydride. In the Henkel reaction of 1,8-naphthalenedicarboanhydride to 2,6-naphthalenedicarboxylic acid (abbreviated as 2,6-NDA) non-cadmium catalytic system was used. In atmosphere of carbon dioxide 1,8-naphthalenedicarboanhydride can be effectively converted to 2,6-NDA in the temperature range of 300~340℃ with zinc carbonate as catalyst and the yield of 2,6-NDA can reach more over 62%.

和国内外绝大多数研究不同的是，论文结合公司自身的原料资源优势和长远规划，提出了从工业苊深加工产品—1，8-萘二甲酸酐出发，经过非镉系催化剂催化转位，然后再进行非酸催化酯化合成2，6-萘二甲酸二甲酯的工艺路线，并对工艺过程中涉及的成盐过程、催化转位反应、酯化反应等进行工艺参数的重点考察，对合成产物进行分析确证。

Basic zinc carbonate; grain size; depth purification; nanocrystalline

碱式碳酸锌；晶粒度；深度净化；纳米微晶

The precursor was prepared with ammonium zinc phosphate and lithium carbonate as materials via solid state reaction at room temperature.The target product was got after baking the non crystals precursor of the compound.

人们从对有层状结构的磷酸盐性质的研究中获知，大量具有层状结构的磷酸盐化合物能够承受离子交换而且还具有良好的催化性能。

The particle size of nanosized zinc carbonate is between 5 nm and 40 nm, and its kinetic parameters of thermal decomposition reaction---activation energy E and reaction order n are 110 kJ.mol－1 and 0.9, respectively.

用透射电子显微镜观察1号、2号和3号纳米碳酸锌粒子，可以看到粒子形状为椭球形，大小均匀，分散性好，没有明显的团聚现象，粒径分别在20～40nm、6～10nm、5～8nm之间；并且用微粒度测定仪测得了粉体的粒度分布图，表明纳米碳酸锌粒子的分布很窄。

In esterification of 2,6-NDA obtained from Henkel reaction of 1,8-naphthalenedicarboanhydride catalyzed non-cadmium catalyst zinc carbonate, the effect of process parameters like esterification catalyst and its amount used, reaction temperature and time, and methanol/anhydride molar ration, etc, was investigated.

在碳酸锌催化和二氧化碳气氛中1，8-萘二甲酸酐于300～340℃反应3～4小时，可以较高收率地获得2，6-萘二甲酸粗品，收率达到62％，该产物可以直接用于合成双酯的酯化反应中。

A variety of aldehydes were converted into acylals in good yields with anhydride in the presence of a catalytic amount of zinc bromide under solvent-free conditions.

以醛和酸酐为原料，溴化锌为催化剂，无溶剂条件下高产率地合成了偕二酸酯（其中醛与苯甲酸酐的反应是首次报道）。

In the natural mineral salt includes many kinds to the human body beneficial ingredient, for example: Potassium, magnesium, sodium, zinc, sulfur, bromide, chloride and trace element and so on.

天然矿物盐中含有多种对人体有益成份，如：钾、镁、钠、锌、硫磺、溴化物、氯化物和微量元素等。

High-density fluids include solids-free, potassium chloride, sodium chloride, calcium chloride, zinc bromide and calcium bromide formulations.

高密度液体包括无固体的氯化钾、氯化钠、氯化钙、锌、溴铵和溴化钙制剂。

Then, it was condensed with-valine methyl ester to form a chiral imine, which was reacted with allyl zinc bromide in the presence of CeCl3·7H2O to afford the corresponding chiral homoallylic amine with high optical activity.

-N-Boc-3-苯基-2-氨基丙醛与-缬氨基酸甲酯缩合生成手性亚胺，在七水合三氯化铈（CeC13·7H2O）催化以及底物的手性诱导作用下，该手性亚胺与烯丙基溴化锌经不对称加成反应合成了高光活性的单烯丙基化手性胺。

Organic matter, pH, cation exchange capacity and contents of potassium, sodium, magnesium, copper, zinc, manganese, cobalt, iron, selenium, iodin and fluorin were determined of rock and soil samples from six main geological background areas within the main ruminant production base, in Yunnan Province, China. Results showed: 1 the red earth area of Paleozoic basalt and red earth area of carbonate the highest; the yellow-red earth area of mixture of carbonate, clasolite and basalt follows, except for its content of Co, which is relatively lower; and the purple earth area of Mesozoic clasolite, the yellow-red earth area of clasolite and the dark red earth area of Precambrian metamorphite are the lowest

对云南省反刍动物生产基地所属的6个主要地质背景区的土壤和岩石样品的K、Na、Mg、Cu、Zn、Mn、Co、Fe、Se、I和F元素及土壤的有机质、阳离子交换量和pH进行测定分析，结果表明：晚古生代玄武岩红壤区和碳酸岩盐红壤区土壤各种矿质元素都比较高，有机质含量与CEC都较高，特别是Ⅴ区最为显著；碳酸岩盐、碎屑岩和玄武岩混合型黄红壤区除了Co含量较低外，其他元素含量都居中等或偏上水平，有机质含量与CEC仅次于第1类背景区；碎屑岩紫色土区、变质岩赤红壤区和碎屑岩黄红壤区大多数矿质养分相对都比较低，有机质含量与CEC最低。

But this is impossible, as long as it is engaging in a market economy, there are risks in any operation.

但是，这是不可能的，只要是搞市场经济，是有风险的任何行动。

We're on the same wavelength.

我们是同道中人。