查询词典 acid reaction

Effects of sonic factors, including dosage of catalyst, calcination temperature of catalyst, nitrated reaction time and recovered catalyst, on the selectivity of toluene in mononitration at the presence of silicotungstic acid catalyst were studied by gas chromatography.

通过气相色谱研究了诸如催化剂用量、催化剂焙烧温度、硝化反应时间、硝化反应温度及催化剂的重复使用等因素对甲苯硝酸硝化区域选择性的影响。

The optimum reaction conditions were: at present of acetic anhydride, a stoichiometric quantity of nitric acid, at room temperature for 40 minutes. Nitration of chlorobenzene gave a,50% yield of mononitro compounds, and an ortho-para isomer ratio 0.20 in product distribution of chlorobenzene mononitration.

结果表明：硅钨酸催化性能较好，催化剂载体以纳米二氧化硅最好，反应条件中醋酸酐用量是主要影响因素；SiW_(12)O_(40)~(4-)／纳米SiO_2催化剂具有强对位选择性：在醋酸酐存在下，氯苯与等当量的硝酸室温下反应40分钟，氯苯一硝化产物中邻／对硝基氯苯异构体的质量比达0.2，产率可达50％。

By a specific process,high quality calcium stearate was prepared by reaction of calcium hydroxide with stearic acid in water under morphemic pressure.

探讨了在常压下水介质中，使用直接法通过由硬脂酸与氢氧化钙反应，制得高质量生物钙强化剂的各种工艺条件。

The chemical analysis result of modified lignin by alkaline-oxygen treatment is as following:The chemical analysis result of modified lignin by alkaline-oxygen treatment showed that the carboxyl group of modified lignin increased, since muconic acid type structure were generated from phenolic structure by ring-open reaction during alkaline-oxygen treatment.

氧碱处理改性木素的化学分析结果见下表；┌────┬────┬─────┬────────────────┬────┐│改性本素│OCH_3│总糖│C_9单元式│COOH │├────┼────┼─────┼────────────────┼────┤│O_4 │8.49 │0.07 │C_9H_(10.45)O_(3.7)(OCH_3)_(053)│10.82 │└────┴────┴─────┴────────────────┴────┘氧碱处理改性木素的化学分析结果表明，改性木素的羧基含量明显增加，在氧碱处理的过程中，由于芳环的开裂，(来源：ABCe6论6d文网www.abclunwen.com)形成了己二烯二酸结构，因此改性木素具有较高的反应活性，易与Al~(3+)形成络合。

Linear dimerization of isoprene to form myrcene ;2. Synthesis of Unsaturated Cyclothioethers byCycloaddition Reactions of Myrcene;3. The traditional synthesis is by the way of Diels-Alder reaction of myrcene with acrolein over Lewis acid catalysts in organic solvent.

二烷基咪唑或烷基吡啶卤化物与ZnCl2 构成一类新型的具有Lewis酸性的离子液体，以其为催化剂和反应介质，通过月桂烯与丙烯醛的Diels Alder反应高区域选择性地合成了对位柑菁醛。

The results show that myristic acid radical anion of precursor Zn0.78 Al0.2220.22c13h27COO0.81H2O can be almost completely replaced by complex anion [La(TiW11 O39)2]^3- under special controlled reaction conditions.

结果表明，该产物中[La(TiW11O39)2](上标 13-)配阴离子沿其长轴垂直于层板的方向分布于水滑石层板间，产物有规整的层状结构、大的层间距(d003=3.29nm)、良好的结晶度和热稳定性，产物对二甘醇与苯甲酸的酯化反应、二甘醇的脱水环化反应和苯甲醛的氧化反应具有良好的催化性能。

By means of the electron microscopic enzymo cytochemistry, it was observed that the activity of acid phosphatase was localized on the autophagic vacuole, the enzyme reaction granules gather to form the vacuolar bodies of various shapes in the cytoplasmic region of the osmiophilic and paraglycogen granules in resting Stylonychia mytilus .

该文应用电镜酶细胞化学方法显示，贻贝棘尾虫休眠包囊中，在胞质嗜锇粒和拟糖原粒区，酸性磷酸酶反应颗粒聚集于具有消化泡作用的泡状体上，葡萄糖 6 磷酸酶反应也定位在自噬泡膜位置。

In this paper, potassium niobate (K4Nb6O17) was prepared by solid reaction and its photocatalytic activities of acid red 3B degradation was studied.

本文采用同相法合成了K_4Nb_6O_(17)并研究了其对酸性红3B溶液的光催化降解性能。

Niobic acid as a solid catalyst can be directly applied in the hydrolysis, esterification, condensation and alkylation reaction etc.

铌酸可直接作为固体催化剂，应用于水解、酯化、缩合、烷基化等反应中；铌酸也作为载体负载金属，应用于F-T合成、氧化反应和加氢等反应中；含铌化合物也可作为负载型催化剂，负载到不同类型的载体上；含铌化合物也作为助剂或光催化剂，广泛地应用于催化多种化学反应。

The experimental method and reaction conditions for synthesis of acetals and ketals on more than 40 catalysts such as solid superacids、 heteropoly acids、 con-exchange、 resins、 molecular sieves、 niobic acid、 vitamin C、 iodine、 sulfate、 chloride、 montmorillonite and etc.

综述了固体超强酸、杂多酸、固载杂多酸、脱铝超稳沸石、树脂、分子筛、铌酸、漆酚衍生物、维生素C、碘、硫酸盐、氯化物、蒙脱土等40多种催化剂催化合成缩醛的方法和反应条件。

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。