查询词典 catalyst

With the raw material of glucose and catalyst of amide, the technology of the preparation of acidproof caramel color was studied.

对以葡萄糖为原料，复合氨基化合物为催化剂制备耐酸型焦糖色素的工艺进行了研究，在单因素实验基础上，通过正交实验得出较好的工艺条件为糖液浓度60%、保温温度145℃、保温时间3h、催化剂用量5%，得到色率达163626，带负电荷的耐酸焦糖色素产品。

The reaction process in methanol solvent can be deduced from the computational results with CPCM solvent model and the supermolecular handling, namely the reaction involves four steps in the methanol solvent. The nucleophilic addition of trimethylamine to acraldehyde generates an enolate. Nucleophilic attack of the enolate on the aldehyde forms the carbon-carbon bond, followed by the proton-transfer process and the further elimination generating the product and liberating the trimethylamine catalyst.

对于CH3OH对反应体系的影响，可以综合考虑CPCM溶剂模型及超分子模型下的研究结果，即CH3OH溶剂中反应按四步进行，催化剂三甲胺首先与丙烯醛发生亲核加成，生成的两性离子中间体与甲醛发生类似于Aldol的醛醇缩合，形成碳-碳键，之后发生分子内质子转移，最后经E1cb消除得到产物，并释放催化剂三甲胺。

So, the addition of Te to MoBiO/SiO2 catalyst promoted the acrolein selectivity greatly.

因此，Te添加量有一最佳范围，n/n为0.05-0.1时催化剂具有较好的催化性能。

The homogeneous hydrogen transfer of acrolein to allyl alcohol was carried out with aluminium isopropoxide as catalyst.

采用异丙醇铝为催化剂，丙烯醛与异丙醇进行均相氢转移反应合成烯丙醇，对催化剂的再利用及催化剂的失活原因进行了研究。

With the H3PW12O40/Al2O3 as catalyst, the conditions of preparing acrolein from glycerol were studied in a continuous fixed bed reactor.

同时利用常压连续流动的固定床反应器考察该催化剂对甘油制备丙烯醛的工艺条件，重点考察了催化剂的种类、杂多酸的负载量、反应温度等条件对反应的影响。

By adopting phosphowolframic acid loaded by Al2O3 as catalyst for preparing acrolein, the corrosion of equipments could be avoided and the environmental pollution was decreased and the glycerol conversion and mole selectivity of acrolein would be increased greatly.

结论］采用Al2O3负载的磷钨杂多酸作为催化剂制备丙烯醛可避免对设备的腐蚀，减少对环境的污染，大大提高甘油的转化率和丙烯醛的摩尔选择性。

The conditions for synthesis of propyl acrylate using strong acidic resin as catalyst were studied.

另外，也与其他催化剂的催化效果进行了比较，说明了强酸性树脂在合成丙酸烯丙酯中的独特优越性。

Bismuth phosphomolybdate is a catalyst in the production of acrylonitrile, an important raw material for fibres and plastics.

磷钼酸铋是一种催化剂，用于丙烯的生产过程，丙烯是生产纤维和塑料的重要原料。

The catalyst is presently produced by in facilities near the acrylonitrile plant.

该催化剂目前由靠近丙烯腈工厂的设备中生产。

The catalyst of the present invention is especially suitable for use in the conditions of low reaction temperature, high reaction pressure and high propylene load, may result in high yield of acrylonitrile, and may be used in industrial production.

本发明催化剂特别适用于在较低反应温度、较高的反应压力和高丙烯负荷条件下使用，且可保持高的丙烯腈单收，可用于工业生产中。

There had been a moment during the breakfast meeting, though, after the backslapping and the small talk and when all of us were seated, with Vice President Cheney eating his eggs Benedict impassively and Karl Rove at the far end of the table discreetly checking his BlackBerry, that I witnessed a different side of the man.

那次早餐会期间，在表示过关心和寒暄以后，我们所有人坐了下来，我注意观察了一下，副总统切尼面无表情地吃着班尼迪克蛋（Eggs benedict，源自美国，以英式松饼、火腿、水煮蛋以及荷兰酱组合而成），卡尔。罗夫在餐桌的远端谨慎地经常查看他的黑莓手机，我目睹了他所不为人知的一面。

Talk Undelete failed; someone else may have undeleted the page first.

Talk 无法删除选定的页面或图像（它可能已经被其他人删除了）。