碱性反应

The catalyst Ti-MCM-41 is used in epoxidation of propylene, in which cumenen hydroperoxide is used as oxidant, alkalescence of solution, reaction temperature and solvent are tested.

将所合成的Ti-MCM-41催化剂用于CHP氧化丙烯的环氧化反应中，对反应液的酸碱性、反应温度及溶剂进行了考察。

The effects of above-mentionedconditions on alkylene reaction are studied to obtain the optimum reactive conditionsby orthogonal experiments having seven factors and three levels. GCLE is chosen as material to prepare 7-phenyl acetamideyl vinyl cephalkyl acidp-methoxy benyl eatsr in the experiment. The process is as follow: GCLE reacts withiodide in solvent, and produce 3-iodid, then reacts with PPh_3 to produce Witting agent,and reacts with HCHO to produce 7-phenyl acetamideyl vinyl cephalkyl acid p-methoxy benyl eatsr in alkaline conditions.

试验选用GCLE作为原料制备7-苯乙酰氨基-3-乙烯基头孢烷酸对甲氧苄酯，反应过程如下：GCLE与碘化物、PPh3在溶剂中反应生成3位膦盐，在碱性条件下生成Wittig试剂再与HCHO反应生成7-苯乙酰氨基-3-乙烯基头孢烷酸对甲氧苄酯。

The results show that, the static interfacial polymerization was conducted in organic phase. The optimized conditions for NF membrane preparation were obtained: the concentration of PDMAEMA was 2%, the concentration of p-xylylene dichloride was 1 ~ 1.5%, NaHCO_3 can be used to maintain alkalescence, The polymerization can be carried out at room temperature and the reaction time was 5 hour.

研究结果如下：此界面聚合反应在有机相中进行；较优的制备条件为：PDMAEMA浓度为2%，对二氯苄浓度为1～1.5%，应加入少量的NaHCO_3来维持溶液的微碱性，室温下反应即可进行，反应时间为5小时。

The results showed that, both diene and alkaline nitrogen-containing compounds had negative influence on the aromatization stability of the catalyst.

用小型固定床加压反应器研究了液化石油气（C4 LPG）中的丁烯在纳米ZSM-5型催化剂DLG-1上的低温芳构化反应，重点考察了原料中二烯烃和碱性氮杂质，以及反应温度、压力和C4 LPG进料重量空速条件对催化剂芳构化反应活性及稳定性的影响。

Advances in the catalysts for synthesis of ethylene glycol ethers via etherification were reviewed, and some suggestion were made for development of new catalysts.

介绍了醚化反应法合成乙二醇醚催化剂的研究进展，并对催化剂的开发提出了建议。在进行环氧乙烷与醇的醚化反应时，使用传统的碱性催化剂，反应容易形成多醚；使用传统的酸性催化剂，反应容易形成有毒物质二烷。

In order to obtain 3-methoxy-4-hydroxymandelic acid with high quality and high yield, guaiacol was condensed with glyoxylic acid in an alkaline aqueous solution using solid acid as catalyst. The reaction temperature and reaction time was 15℃ and 18 hours respectively.

为了得到高质量和高收率的3-甲氧基－4-羟基苯乙醇酸，使愈创木酚和乙醛酸在碱性水溶液中在固体酸催化剂存在下进行缩合反应，反应温度15℃，反应时间18h。

The surplus Na2CO3 will later react with nepheline to formalkaline nepheline [(Na2O)0.33NaAlSiO4].The optimal reation condition wasdetermined by the experiments as follows: the ratio of the high-alumina fly ash toNa2CO3 is 1.8:1 by mass,and that the optimal temperature is 850℃ for 90min.The dissolution reaction of nepheline in HCl solution is also thermodynamicallyanalyzed.

对高铝粉煤灰与Na_2CO_3的固相热分解反应的实验研究表明：当Na_2CO_3过量时，过量的Na_2CO_3会与生成的霞石发生反应，生成碱性霞石(Na_2O)_0.33NaAlSiO_4；通过实验确定了Na_2CO_3的最佳用量为：高铝粉煤灰： Na_2CO_3=1.8：1，反应的最佳温度和时间分别为850℃和90min。

This complex reaction was phenolic electronic substitution reaction, so reaction rate was related with the positive electricity of pro-electronic reagent, as well as the form of aromatic hydrocarbons. Rates of chlorination of phenol and 2-monochlorophenol were faster in alkaline water than that in weak acid water, so 2,4-dichlorophenol and 2,4,6-trichlorophenol formation concentrations increased with the reaction time.

该复合反应属于酚类电子取代反应，反应速率与亲电子试剂的阳电性以及芳香烃的形式有关，碱性水环境中氯取代苯酚和2-一氯酚的速率要快于在弱酸性水环境；随着pH的升高，2，4-DCP和2，4，6-TCP的生成浓度也不断增加。

The thermodynamics and the dynamics mechanism have been studied.The results show that it is advisable for the HCHO and NaH_2PO_2 as the reduction due to the electrode potential of the reduction is more negative than that of Cu~ 2+ from the analysis of data in thermodynamics.It is advantage for the reaction of electroless copper in the alkaline solution. According to the analysis of Tafel slope of a cathodal polarization curve,...

结果表明：从热力学数据分析看，还原剂的电极电位皆比铜离子负，用甲醛、次亚磷酸钠做还原剂还原Cu2+在热力学上是可行的，在碱性溶液中对化学镀铜反应有利；从阴极极化曲线的Tafel斜率分析看，Cu2+=Cu+步骤为阴极反应的速度控制环节；从镀液的旋转圆盘电极测试结果分析看，电子跃迁步骤H2CO-ad rdsHCOOH+1/2H2+e-为镀液中阳极反应速度的控制性步骤。

The general formulas of these compounds are as follows:The strobilurin derivatives were synthesized from substitutedβ-keto esters (2) as starting material which were prepared from substituted ketones (1) and dimethyl carbonate. The ester (2) and methyl hydrazine or substituted amidine were dissolved in methanol and the mixture was heated to reflux to obtain the substituted 5-hydroxy-1H-pyrazole (3) or 4-hydroxy-pyrimidine (4). The title compounds were prepared by reacting the intermediates (3 and 4) with substituted halomethylphenyls which contain four active group under basic conditions.

本论文所合成的strobilurin化合物均是以β-酮酸酯类化合物(2)为起始原料合成的，该中间体(2)是由酮类化合物(1)与碳酸二甲酯在碱性条件下反应生成的，中间体(2)与甲基肼或取代脒类化合物在甲醇中回流制得取代的1H-5-羟基吡唑(3)或4-羟基嘧啶(4)，中间体(3和4)再与包含四种活性基的苄卤中间体在碱性条件下制得目标化合物。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。