查询词典 reaction engine

When the reaction temperatures were 303.15, 308.15, 313.15, 318.15, 323.15 and 328.15 K, respectively, the apparent reaction rate constants of abietic acid were 0.0036, 0.0041, 0.0062, 0.0087, 0.011 and 0.0157 min^(-1), respectively. Its reaction activation energy was 50.29 kJ/mol.

枞酸的氧化反应温度为30，35，40，45，50和55℃时，表观速率常数分别为0.0036，0.0041，0.0062，0.0087，0.011和0.0157min^(-1)，表观反应活化能E为50.29kJ/mol。

The optimum reaction conditions were as follows: rosin 5 g, m: in: m 1:2:2, palladium chloride 0.090 %, n: n1:10, hydrogen pressure 5 MPa, reaction temperature 160℃ reaction time 3 h, mass fraction of abietic acid could be under 1%, mass fraction of dehydroabietic acid was 5.6%, which conforms to the national standards. The regeneration of catalyst was investigated. After cycling five times, the product of hydrogenated rosin still conforms to the national standards without any treatment of catalyst.

在松香5g、m：m：m1：2：2、氯化钯0.090%、n：nl：10、氢气压力5MPa，反应温度160℃，反应时间3h的较佳工艺条件下，产物氢化松香中极酸的质量分数小于1%，去氢枞酸的质量分数5.6%，符合GB/T 14020-2006国家标准；并对催化剂的重复使用性能进行了考察，催化剂相不经过处理直接重复使用5次后，产品氢化松香仍然符合国家标准中关于枞酸和去氢枞酸的指标要求。

By using GC/MS, the process of oxidizing reaction of atractylone is studied, and five decomposition products are obtained, which is greatly different from the references-only two decomposition products, and the mechanism of oxidizing reaction of atractylone is investigated. The hypothesized mechanism of reaction is: atractylone is readily to additively react with water and to generate the semiacetalhydroxyl at 1, 4-site.

利用GC/Ms法跟踪分析了苍术酮纯品的分解过程，得到5种分解产物―与文献报道的苍术酮转变成2种产物存在较大的差异；研究了苍术酮的氧化反应机理：苍术酮与水易进行1，4加成反应，生成半羧醛羟基。

For the synthesis reaction of chalcone, cyclohexanone aldolization and biodiesel,γ-Al_2O_3-NaOH-Na solid superacid has a satisfactory catalytic activity. With hypnone and phenylaldehyde as raw material, amount of catalyst 7.5% wt% of material, mole ratio of hypnone and phenylaldehyde 1:1.1, reaction temperature 40℃, after 3 hours, the yield of chalcone can be up to 96.88%. With cyclohexanone as raw material, amount of catalyst 10% wt% of material, reaction temperature 190℃, after 3 hours, dimmer of cyclohexanone can be up to 85.66%.

将该固体超强碱催化剂应用于查尔酮、环己酮自缩合以及生物柴油的合成反应中，该改性固体超强碱催化剂表现出了良好的催化活性：以苯乙酮和苯甲醛为原料，反应温度为40℃，催化剂用量为反应物总质量的7.5％，苯甲醛与苯乙酮摩尔比为1：1.1，反应3h查尔酮产率可达96.88％；以环已酮为原料，催化剂用量为原料总质量的10％，反应温度为190℃，反应3h，二聚物的总收率可达85.66％；以动物油和甲醇为原料，醇油摩尔为9：1，催化剂用量为动物油质量的2％，反应温度为70℃，反应3h后，生物柴油的收率可达91.8％。

It was found that the alkoxy of the aluminium alkoxide can be exchanged to the arkoxy of the raw material or product in the process of reaction. The alcohol producing in the exchange reaction reduces the yield of furan phenol by the further by-reaction of the alcohol with the raw material or product.

结果表明，醇铝在催化单醚合成呋喃酚过程中，醇铝中的烷氧基与原料单醚和产物呋喃酚的芳氧基发生了交换，交换生成的醇与单醚或呋喃酚发生副反应降低了呋喃酚收率。

The terminal allylation reaction was studied which was influenced by reaction time, reaction temperature, category and dosage of allylation reagent and molecular weight of polyether.

其次对双羟基聚醚的端烯丙基化反应进行研究，讨论了反应时间、反应温度、聚醚分子量、烯丙基化试剂的种类和用量对反应的影响。

The experiments on the chemical synthesis of DL-phenylalanine employed the Modified Aniline way, the Diazo Reaction, Hydrolysis Reaction, and Aminate Reaction in turm to synthesize the DL-phenylalanine.

混旋苯丙氨酸化学合成实验部分首先采用改进苯胺法，经重氮化反应、Meerwein反应、水解反应、氨化反应，合成混旋苯丙氨酸，收率达到84％。

The yield was 84%. With OP-10, NPE as the the catalyzer for the diazo reaction, the use of hydrolyzed propenenitrile instead of propenoic acid, and OP-10 as the catalyzers of the aminate reaction, these experiments showed the feasibility of industralization, due to the much reduced costs, shortened reaction time and a higher yield.

采用壬基酚聚氧乙烯醚（OP-10）、萘磺酸甲醛缩合物作重氮化反应催化剂，丙烯腈加成、水解替代丙烯酸，OP-10做氨化反应催化剂，通过四因子三水平正交试验法实验，得到较佳反应参数，反应时间、收率、成本都大大降低，适宜工业化生产。

The proper synthetic technology are as follows: molar ratio of P-aminobenzene sulfonic acid/phenol/formaldehyde is 1∶2∶9, concentration of P-aminobenzene sulfonic acid is 0.4mol·L~-1 , pH of reaction system is 8.0, reaction temperature is 95℃ and reaction time is 3.5h. aminobenzene sulfonate ; dispersant ; ceramic grind additives

国外在磨矿行业已大量使用高效减水剂助磨并取得了显著效果，国内关于这方面的研究起步较晚，主要采用如碳酸钠、硅酸钠、磷酸钠等无机盐，而且也主要是用于有色金属选矿方面，在硅酸盐工业原料加工中有部分采

As to the curing reaction of the modified phenolic epoxy resins, there is the etherification reaction between phenolic hydroxyl groups and epoxy groups. When the secondly modified epoxy resins are cured at higher temperatures respectively, the absorbance increasing at 1670Cm〓 and 1640Cm〓 are indicative of aminolysis reaction.

对于改性酚醛环氧树脂的固化反应，有酚羟基和环氧基间的醚化反应，二次改性环氧树脂在较高的温度固化时，1670Cm〓和1640Cm〓吸收峰的增加说明有氨解反应。

The receding calculations and experiment analyses in this subject are built on the blood cast of pig tongue.

本研究课题的前期工作是采用猪舌血管铸型模拟人舌而进行的数值计算与实验分析。

"Each human infection constitutes an opportunity for genetic modification of the virus through reassortment, mutation, or both...."

&每一次人类的感染都暗藏着一次基因修改的机会，无论是通过病毒的整合、突变或者兼而有之。。。。&