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yield up
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  收率
    The optimum conditions are molar ratio of benzaldehyde to 1,2propanediol was 1:1.5, the quantity of catalyst was equal to 0.3% feed stock, and the reaction time was 1.0 h. TiSiW12O40/TiO2 was an excellent catalyst to synthesize benzaldehyde 1,2propanediol acetal with a optimal yield up to 90.0%. 
    实验表明:TiSiW12O40/TiO2是合成苯甲醛1,2-丙二醇缩醛的良好催化剂,在苯甲醛与1,2-丙二醇的摩尔比为1:1.5,催化剂用量为反应物料总质量的0.3%,环己烷为带水剂,反应时间1.0h的优化条件下,苯甲醛1,2-丙二醇缩醛的收率可达90.0%.
短句来源
    Suitablereflux ratio and quantities of additives were discussed and determined. Geraniolproduct was gained with purity above 90% and yield up to 86%, and nerol productwas gained with purity above 90% and yield up to 60%.
    确定了适宜的变回流比、络合剂用量等条件,获得了含量90%以上的单一产品,橙花醇产品的单程收率为 86%,香叶醇的收率为 60%。
短句来源
    By one-pass distillation operation under the condition described above,nerol and geraniol were gained with yield up to 65% and purity above 90%. The experimental results provided an important basis for technique innovation in factories,for the total cycle time is adoptable and the process is steady without thermal decomposition.
    实验结果显示,单塔精馏即可得到含量大于90%的橙花醇和香叶醇,收率在65%以上,提高20%无热分解现象,过程稳定,为工业生产奠定了基础。
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  “yield up”译为未确定词的双语例句
    Ferment conditions of strain L29-9,including carbon source,nitrogen source,pH,and culturing time,were studied and the optimum conditions were as follows: citric acid 2g/L,yeast extract 5g/L,pH7.0,culturing for 40h. Biotransformation using whole cells of the strain was inducted at 30℃ for 12h,giving(-)-γ-lactam as enantiopure product with yield up to 40% and 99.5% e.e.
    结果表明:当选择碳源柠檬酸2g/L、氮源酵母提取物5g/Lp、H 7.0、培养时间40h时,通过完整细胞转化,在30℃下经过12h的反应,产物(-)γ-内酰胺产率达40%,ee值99.5%。
短句来源
    The factors of influencing reaction were investigated. Experimental results indicated that the optimum conditions of esterification reaction are the molar ratio of hexanoic acid isopentanol and p-tolueue sulphonic acid 1:3:0.074,the reaction timel 15min,and the yield up to 98.92%.
    考察了影响反应的因素 ,实验结果表明酯化反应的最佳条件 :己酸、异戊醇、对甲苯磺酸的摩尔比为 1:3:0 0. 74 ,反应时间 15~2 0min。 产率可达 98 .92 %。
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  yield up
The RNA-1 components of all three viruses were translated to yield polyproteins of Mr 250k, which were autocatalytically processed to yield up to five cleavage products.
      
Unsaturated 1-pyrazoline3 obtained from diazocyclopropane and norbornadiene decomposes at 330-370°C with elimination of cyclopentadiene to give 3(5)-vinylpyrazole in a yield up to 75%.
      
Salts of 2-halosubstituted 1,3-diketones form more highly enolized cyclic 1,3-diketones - 1,3-cyclohexanedione and dimedone under analogous conditions, with a yield up to 90%.
      
In the presence of a mediator (sodium iodide) acetylacetone dimerizes with the formation of 3,4-diacetylhexane-2,5-dione, with a yield up to 90%.
      
The formation of a certain conformation of the DHDP chain produced by the central atom of the metal complex-former permits the asymmetric synthesis of N-acetylphenylalanylmethionine with the optical yield up to 40%.
      
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In this article, the reaction mechanism of esterification of tosylchloride with menthanetriol in anhydrous pyridine to form 2 tosyloxy 1,8 p menthanediol, and factors influencing the synthesis were studied. Detosylation of 2 tosyloxy 1,8 p menthanediol via C—C bond rearrangement to produce 2 (3 acetylcyclopentyl) 2 propanol was studied. This reaction could be proceeded smoothly in methanolic KOH at room temperature at yield up to 90.7%. The cause for the formation of cis and trans isomers...

In this article, the reaction mechanism of esterification of tosylchloride with menthanetriol in anhydrous pyridine to form 2 tosyloxy 1,8 p menthanediol, and factors influencing the synthesis were studied. Detosylation of 2 tosyloxy 1,8 p menthanediol via C—C bond rearrangement to produce 2 (3 acetylcyclopentyl) 2 propanol was studied. This reaction could be proceeded smoothly in methanolic KOH at room temperature at yield up to 90.7%. The cause for the formation of cis and trans isomers of cyclopentane hydroxy ketone was discussed. The products were purified by vacuum distillation, recrystallization and preparative TLC. Structures of the products were identified by GC,IR,MS, 1H NMR, 13 C NMR and physical constants, such as melting point, boiling point, refractive index and density were determined respectively . Among them, MS and 13 C NMR of 2 tosyloxy 1,8 menthanediol and cyclopentane hydroxy ketone have not been hitherto reported in the literatures. The odor characteristics of cyclopentane derivatives had been reported in literatures . This paper provides an experimental base for further synthesing a series of cyclopentane derivatives as a new class of perfumery materials.

讨论了对-三醇和对-甲苯磺酰氯起酯化反应得对-二醇单酯的机理,探讨了影响反应的一些因素。结果表明:在无水吡啶中,反应温度为0~10℃,酰氯稍过量情况下起酯化反应,得率为79.3%。还讨论了二醇单酯的脱对-甲苯磺酸根,取代六员环经C—C键重排形成环戊烷羟基酮的反应,此反应在含有氢氧化钾的甲醇溶液中和室温下能顺利进行,产率达90.7%,并探讨了产生环戊烷羟基酮顺、反2种异构体的原因。利用减压蒸馏、重结晶和制备薄层色谱技术纯化合成产物,并进行GC、IR、MS、1HNMR、13CNMR定性和定量分析,测定它们的熔点、沸点、折光率和比重等物理常数,其中二醇单酯和环戊烷羟基酮的MS、13CNMR未见文献报道。环戊烷衍生物的香气已为文献所证实,本文提出的合成方法为合成工艺设计提供了实验基础。

Benzaldehyde 1,2propanediol acetal was synthesized from benzaldehyde and 1,2propanediol in the presence of TiSiW12O40/TiO2. The factors influencing the yield of product and the optimum reaction conditions were discussed. The optimum conditions are molar ratio of benzaldehyde to 1,2propanediol was 1:1.5, the quantity of catalyst was equal to 0.3% feed stock, and the reaction time was 1.0 h. TiSiW12O40/TiO2 was an excellent catalyst to synthesize benzaldehyde 1,2propanediol acetal with a optimal...

Benzaldehyde 1,2propanediol acetal was synthesized from benzaldehyde and 1,2propanediol in the presence of TiSiW12O40/TiO2. The factors influencing the yield of product and the optimum reaction conditions were discussed. The optimum conditions are molar ratio of benzaldehyde to 1,2propanediol was 1:1.5, the quantity of catalyst was equal to 0.3% feed stock, and the reaction time was 1.0 h. TiSiW12O40/TiO2 was an excellent catalyst to synthesize benzaldehyde 1,2propanediol acetal with a optimal yield up to 90.0%.

 以固载杂多酸盐TiSiW12O40/TiO2为多相催化剂,通过苯甲醛和1,2-丙二醇反应合成苯甲醛1,2-丙二醇缩醛,探讨了TiSiW12O40/TiO2对缩醛反应的催化活性,较系统地研究了原料量比,催化剂用量,反应时间诸因素对产品收率的影响。实验表明:TiSiW12O40/TiO2是合成苯甲醛1,2-丙二醇缩醛的良好催化剂,在苯甲醛与1,2-丙二醇的摩尔比为1:1.5,催化剂用量为反应物料总质量的0.3%,环己烷为带水剂,反应时间1.0h的优化条件下,苯甲醛1,2-丙二醇缩醛的收率可达90.0%.

Nerol and geraniol are important fragrant additives widely used in many areas.Both of them are temperature sensitive materials and the difference of the boiling point between them is 2℃ only.Vacuum batch distillation may be preferable for processing temperature-sensitive materials.In the previous study on the purification of nerol and geraniol by vacuum batch distillation,the temperature of still pot was high,the period of experiment was too long and yield was small(46%) though distillate of nerol's purity above...

Nerol and geraniol are important fragrant additives widely used in many areas.Both of them are temperature sensitive materials and the difference of the boiling point between them is 2℃ only.Vacuum batch distillation may be preferable for processing temperature-sensitive materials.In the previous study on the purification of nerol and geraniol by vacuum batch distillation,the temperature of still pot was high,the period of experiment was too long and yield was small(46%) though distillate of nerol's purity above 90% were gained.Distillation at lower pressure results in lower temperature of still pot and higher relative volatility,and operation for a constant product of composition at the column top is mostly applied to separate batches of binaries.In this paper,the effects of operational conditions such as time of total reflux,reflux ratio pressure on the purity of nerol and geraniol are investigated.This research chooses following experimental conditions of distillation:600 to 700Pa operational pressure,temperature of still pot at about 152℃,top temperature at about 80℃,5.5h to 6h time of total reflux,reflux radio varying from 20/1 to 5/1,and (4 800) to (4 900)Pa pressure drop of column.By one-pass distillation operation under the condition described above,nerol and geraniol were gained with yield up to 65% and purity above 90%.The experimental results provided an important basis for technique innovation in factories,for the total cycle time is adoptable and the process is steady without thermal decomposition.

橙花醇和香叶醇是重要的基础香料,沸点差仅为2℃,具有热敏性。以往研究中应用减压间歇精馏分离橙花醇和香叶醇的混合物,一次精馏得到90%以上的产品收率低(仅为46%),且塔釜温度较高,操作周期长,不宜于工业生产。本文针对沸点差较小的热敏性物系,采用减压高效间歇精馏方法对橙花醇和香叶醇的混合物进行了分离研究。通过考察全回流时间、回流比、加热负荷和压力等操作因素对分离效果的影响,确定了适宜的操作条件,塔顶压力为600Pa~700Pa,塔压降为4800Pa~4900Pa,釜温在150℃~152℃之间,全回流6h,采用20 1,10 1,5 1的变回流比操作。实验结果显示,单塔精馏即可得到含量大于90%的橙花醇和香叶醇,收率在65%以上,提高20%无热分解现象,过程稳定,为工业生产奠定了基础。

 
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