反应率

In the course of oxidation, reaction temperature should rise step by step, and in the late stage, reduced pressure distillation should follow so that the concertration of gly oxalic acid can rise and production rate of allantoin can rise up to 40%.

在氧化反应的过程中逐步地提高反应温度，反应后期进行减压浓缩，提高了乙醛酸的浓度，缩短了氧化时间，并使尿囊素産率达到40%。

The results show that: for 0.05 mol p-Nitro anisole, the reaction medium is isopropanol, the temperature 70℃, the mole scale n(p-Nitro anisole):n=1:4, the reaction time 130 min and the yield 88.45%.

结果表明：对0.05mol的对硝基苯甲醚，反应介质为异丙醇，反应温度为70℃，物料比为n：n=1：4，反应时间为130min，产率为88.45%。

The capacity is even more prominent in anode of cell.

而反应物到达反应区的质量传递率主要是由反应物在介质中的传递机理决定的[1]。

Benzoin condensation using imidazolium based ionic liquids as solvent for the first time has been successfully achieved. The reaction conditions have been studied in detail. When under 65 and with 0.5 equiv. NaOH in ionic liquid l-butyl-3-methyl-imidazolium tetraborate, benzoin was obtained in excellent yield of 91%. Recycling of ionic liquid has been available.

首次探索并成功实现了在咪唑鎓盐离子液体中进行苯偶姻缩合反应，详细探讨了反应条件，当反应在65℃下和0.5当量NaOH存在下以及在离子液体4-丁基-1-甲基咪唑鎓四氟硼酸盐中进行时，苯偶姻产率可达91％；并对离子液体进行了有效回收再利用。

The reaction of α-hydroxyketone with Michael acceptor nitroalkene.was studied. After many experiments, we then found that in the presence of Zn2 and cinchonine, the α-hydroxyketone could successfully react with nitroalkene. Under our optimized condition, we gained the 95% yield of product with the ratio of syn : anti of 3:1 and 72% ee value for syn-product.

有机碱作用下α－羟基酮对硝基烯烃的加成反应研究研究了α－羟基酮类化合物与Michael受体硝基烯烃类化合物的反应，通过分析和实验发现在Zn2和辛可宁的作用下α－羟基苯乙酮能够与硝基烯烃化合物顺利反应，在优化的条件下以95%产率和3：1的Dr主要得到顺式产物，其中顺式产物的ee值最高为72%。

The optimal conditions were found to be with reaction temperature of 40－50 ℃,the ratio of chitosan to citral of 1∶6 and 10 h of reaction time.

最佳条件为：反应物配比n∶n=1∶6，反应温度40～50 ℃，反应时间10 h，壳聚糖席夫碱的缩合率可达86%，取代度为0.82。

Effect of the ratio of chitosan to citral,reaction time and temperature on the yield and the degree of substitution has been investigated.

采用[L9（33）]正交实验探讨了反应时间、反应温度及反应物配比对壳聚糖席夫碱缩合率和取代度的影响。

The reaction of polyfluoroalkyl iodides with 4-pentenoic acids in the presence of sodium dithionite at room temperature in aqueous acetonitrile solution [CH〓CN: H〓O=3: 1 ] to gave the corresponding adducts, the latter could form γ-lactones 31～51 in the same medium in 62～92％ yield.

室温下，在乙腈/水[3：1]的介质中，多氟烷基碘化物在连二亚硫酸钠的存在下与4-戊烯酸及其在2或3位上具有取代基团的衍生物进行反应，反应2～5h，起先生成两者的加成物，该加成物无需分离，在同一介质中，可进一步反应得到相应的多氟烷基取代的γ-丁内酯31～51，产率62％～92％。

The results indicated that the highest yield of BOC-indigo was 97% in CH2Cl2, and the lowest one was in PGMEA. It showed that the yield of BOC-indigo increased with high polarity and low molecular volume of solvent.

从实验结果得知，以极性较强且分子体积较小的二氯甲烷作为反应溶剂，其合成隐性颜料产率可达到97.2%，较四氢呋喃产率多4.4%，且较丙二醇甲醚乙酸酯产率多7.4%。

The conversion of CaO in CaO-kaolin is improved much more than that of pure CaO by 26% when reacting at 100?9?℃. The grain model of reaction kinetics is used to describe the sulfur fixing process of CaO-kaolin. Because of incr...

研究表明，CaO 超细高岭土复合固硫剂有着较好的固硫率，特别是高于1000℃时在固硫反应后期的产物层扩散控制阶段呈现很好的固硫率增长，1009℃下固硫率较CaO提高达26%。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。