查询词典 acid reaction

The same methods were used to study toluene dinitration, and the results indicated that the thermal runaway risks of these reactions were low too; prolonging dosing duration was helpful to the conversion of all nitrotoluene; decreasing the molar ratio of nitric acid to mononitrotoluene would make an insufficient conversion; among the given temperatures, rising reaction temperature couldn\'t markedly change the yield coefficient, but lead more heat generation and higher thermal runaway risk.

采用同样的方法对二段硝化反应进行研究，结果表明：二段硝化反应的热失控危险性也较低；延长加料时间，有利于反应完全；而随着硝酸与一硝基甲苯摩尔比的减小，硝化难以进行完全；在选定温度范围内升高温度，产物得率无显著变化，反而易导致放热加剧，增加体系的热失控危险。

In pH=2.0 sulfuric acid solution, 2,2′bipyridine, an almost nonluminescent compound was transformed into a highly fluorescent compound (λex=340 nm,λem=430 nm) when attacked by ·OH generated by Fenton reaction.

在酸性介质中，Fenton反应产生的羟基自由基能将几乎无荧光的2，2′-联吡啶氧化成强荧光物质，羟基化产物的最大激发和发射波长分别是340 nm和430 nm。

The experiment results showed that the optimum reaction condition were as follow: concentration of H_(2)SO_(4) was 0.5 mol/L, calcinations time were 4 h at the temperature 550℃, the molar ratio of acrylic acid to octadecyl alcohol was ...

丙烯酸十八酯的优化工艺条件为：丙烯酸与十八醇的摩尔比为1.2，固体超强酸及对苯二酚的用量分别为6%、0.8%，反应温度为120℃，反应时间为3 h。在此反应条件下，酯化收率可达97%。

The production was further verified with IR.The experiment results showed that the optimum reaction condition were as follow:the molar ratio of acrylic acid to octadecyl alcohol was 1.2∶1,the amounts...

由实验得出的最佳合成条件是：丙烯酸与十八醇的摩尔比为1.2∶1，固体超强酸及对苯二酚的质量分数分别为6%，0.8%，反应温度为120℃，反应时间为3 h，在此反应条件下，酯的产率可达97%。

The product synthesized under the optimum conditions as follows had final acid value of 0.494 mgKOH/g,and conversion of reatants up to 99.59%,molar ratio of isooctanol to phthalic anhydride 3∶1,the dosage of both aluminium oxide and stannous octoate as catalyst 0.2%(based on the total mass of reactants),reaction time 2.5 hours.

考察了工艺条件对合成DOP的影响，结果表明，在异辛醇与苯酐摩尔比3∶1，氧化铝/辛酸亚锡复配催化剂用量分别占反应物总量的0.2%，反应温度230℃，反应时间2.5h的最佳工艺条件下，产品终点酸值0.494mgKOH/g，反应物转化率达99.59%。

Oilstock ; soapstock ; hydrolysis reaction ; mixed fatty acid

油脚；皂脚；水解反应；水解工艺；混合脂肪酸

Olid super acid of SO_4~(2-)/ZrO_2 and SO_4~(2-)/SnO_2 type have attracted much attention for its strong acidity and good performance in catalyzing organic synthesis reaction, while fewer reports on modification and application of SO_4~(2-)/Fe_2O_3 have been made.

O_4~(2-)／ZrO_2、SO_4~(2-)/SnO_2型固体超强酸因其较强的酸性，在催化有机合成反应中具有较高的活性而备受关注，而关于SO_4~(2-)／Fe_2O_3固体超强酸的改性及应用的报道相对较少。

On such basis, a new porous structured heteropoly acid catalyst is obtained by salt-gel reaction, using tetraethyl orthosilicate as the silicon source.

在此基础上，以正硅酸乙酯为硅源，利用&盐—凝胶&法得到一种新型介孔结构的杂多酸催化剂。

In a DMF solution of CuCl〓-ethanolamine-acetic acid (1: 2: 2), 27 formed a highly oxidized heterocyclic compound 2-hydroxymethyl-naphtho [1, 2-a] oxazole (30) by the carbon-nitrogen coupling and carbon-oxygen coupling with the ligand of ethanolamine, which brings a chance to develop a novel approach to this heterocyclic compound via one-pot reaction of phenols under mild condition.

在氯化铜—乙醇胺—乙酸（1：2：2）的DMF溶液中，27与配体乙醇胺发生碳氮偶合与碳氧偶合，生成深度氧化的杂环化合物：2-羟甲基-萘并[1，2-a]〓唑（30）。这可望为酚类一锅化直接转化为30及其类似物提供一种简便的新合成路线。

Azobis-4-cyanopentanoyl chloride was prepared by reaction of 4,4'-azobis-4-cyanopentanoic acid and phosphorus pentachloride.

采用4，4'-偶氮二（4-氰基戊酸）与五氯化磷反应制备了4，4'-偶氮二（4-氰基戊酰氯）。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。