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Preliminary Study on Enzymatic Modification of Protein──Study on Plastein Reaction of Soybean Protein with Sesame Protein;2. Utilizing alkaline hydrolysate of rice protein as substrate,the effect of plastein reaction condition on the yield of plastein was studied.

以大米蛋白的碱性蛋白酶水解产物为原料,研究了反应条件对类蛋白反应产率的影响,采用正交试验优化了类蛋白反应的条件,并分析了最佳条件下类蛋白的氨基酸组成。

The best reaction conditions of the second step was confirmed by the orthogonal experiment. Its yield was 90.5% when the reagents were refluxed for 3.0 h at 120℃.

第一步反应很快,回流30 min即可;通过正交试验得出第二步反应的最佳条件为:反应体系在120℃回流3.0h,产物的产率为90.5%。

It showed that, compared with other catalysts, SO(superscript 2- subscript 4)/TiO2-ZrO2 was more active to bring about more than 95% conversion rate of stillingia oil under the transesterification conditions of 150℃, molar ratio of methanol to oil 12:1, catalyst amount 5% and reaction time 6h.

结果表明,催化剂SO(上标 2-下标 4)/TiO2-ZrO2表现出了较高的催化活性,SO(上标 2-下标 4)/TiO2-ZrO2催化的最佳酯交换反应条件为:反应温度150℃,醇油摩尔比12:1,催化剂用量5%,反应时间6h,此时乌桕籽油的醋化率超过95%,且催化剂重复和再生使用效果良好。

Molybdophopsphoric Acid Catalysis in the Oxidative Cleavage of Olefins by the Hydrogen Peroxide Oxidative cleavage of the double bond could be catalyzed by H_3PMo_(12)O_(40) using H_2O_2 as oxidant, various trisubstituted olefins were oxidized to aldehydes or ketones in high yields. The system was not satisfied for electron-deficient olefins such as trans-(2-nitrovinyl) benzol or chalcone. The reaction of aliphatic olefins did not occur under the same conditions.

二、磷钼酸催化过氧化氢对烯烃的氧化断裂反应用过氧化氢(30%)作为氧化剂,磷钼酸可以催化氧化碳碳双键的断裂反应,三取代的烯烃被氧化生成醛或酮,产率较高;此体系对于缺电子烯烃如查尔酮,不饱和硝基化合物的断裂反应效果较差,脂肪族烯烃在此体系下的氧化并不发生。

The similar nicotinoyltrifluoroacetones are synthesized from acetylpyridine and ethyl trifluoroacetate through Claisen reaction.The influnences of alcoholic natrium,reaction temperature and solvent on reaction yield is studied.The subliming method is improved.

本文以乙酰吡啶和三氟乙酸乙酯为主要原料,利用克莱森酯缩合反应,合成了三种相似结构的吡啶甲酰三氟丙酮化合物,考察了碱性试剂醇钠、反应温度和溶剂等因素对反应产率的影响,改进了纯化产物的方法。

A yield of 88% for TMH can be obtained by using the optimized synthetic conditions as follows: molar ratio of formaldehyde to octylaldehyde 4.5: 1.0, molar ratio of sodium hydroxide to octylaldehyde 1.4: 1.0, aldol condensation temperature 35℃ and time 240min Cannizzaro reaction temperature 55℃ and time 180min.

结果表明,优化的合成三羟甲基庚烷的反应条件是,n/n=4.5,n/n=1.4,羟醛缩合反应温度和时间分别为35℃和240min,康尼扎罗反应温度和时间分别为55℃和180min,摩尔产率可达88%。

This paper mainly studies the synthesis of 2-Isopropyl-5-Methyl-2-Hexenal from the optimum reaction conditions of from self aldol condensation of Isovaleraldehy,with NaOH solution as the catalyst of the condensation.

本文以NaOH水溶液为催化剂,探讨了异戊醛Aldol缩合制备可可醛(2异丙基5甲基2己烯醛)的最佳反应条件:反应温度50℃、反应时间9h、催化剂NaOH水溶液的浓度2mol.L1、OH-/异戊醛为1/1,主产物可可醛的产率为92.2%。

The optimal operation condition of Friedel-Crafts acylation for product Ⅰ was determined by orthogonal experiment: 0.02mol N-ethyl- carbazol, n Benzoyl chloride/n N-ethyl- carbazol=1.2, n AlCl3/n N-ethyl- carbazol=1.2 , at 25 oC for 3.5h. The yield was 94.6%.

通过正交设计实验,探讨了产物Ⅰ的Friedel-Crafts 酰化的最佳反应条件:N-乙基咔唑为0.02mol时,反应物苯甲酰氯与N-乙基咔唑摩尔配比为1.2。,催化剂AlCl3与N-乙基咔唑摩尔配比为1.2, 25℃下反应3.5h,产率可达94.6%。

Reaction of L-tyrosine with benzyl bromide in the presence of copper sulfate led to the protection of phenol group on the side chain of L-tyrosine to give H-Tyr-OH in 45% yield via a copper complex intermediate.

酪氨酸与溴化苄在硫酸铜存在下反应,选择性地在其侧链酚羟基上引入苄基保护基,通过反应条件的优化,反应产率达到45%。

Effects of reaction temperature, reaction time, the amount of alkali, benzyl chloride and quaternary ammonium on grating rate of benzylated natural bamboo fiber have been discussed.

以接枝率为考察目标用正交试验探索了反应温度,碱用量,反应时间,氯化苄及助剂季铵盐的用量5个因素对天然竹纤维苯甲基化改性的影响,确定了最佳反应条件。

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