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conditions
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  工艺条件
    PRODUCTION OF PULP AND RECOVERY OF XYLOSE FROM HARDWOOD——Ⅱ. The Optimal Process Conditions for Prehydrolysis of Eucalyptu Citriodora Chips with Dilute Sulphuric Acid and Sulfate Pulping
    用阔叶材生产纸浆和回收木糖的研究——Ⅱ.柠檬桉木片稀硫酸预水解最佳工艺条件和硫酸盐制浆
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    THE OPTIMUM PROCESSING CONDITIONS OF POLYOLEFINE
    关于聚烯烃加工工艺条件优化的讨论
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    Analysis of Optimum Technological Conditions for Dehydrogenation of Ethane
    乙烷裂解反应最佳工艺条件分析
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    On the Technological Conditions of Extracting Hypo from Phenolic Waste
    苯酚下脚料制取海波工艺条件的探讨
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    Study on the Technological Conditions for Synthesizing Vinyl Acetate from Acetylene
    乙炔法合成醋酸乙烯工艺条件的研究
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    SYNTHESIS OF (±) METHYLDOPA BY DICHLOROCARBENE REACTION IN PTC CONDITIONS
    应用相转移催化二氯卡宾反应合成(±)甲基多巴
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    Optimization of Operating Conditions of Ethylene Plant
    乙烯生产装置的优化操作
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    Quality Control of Cystine and It’s process Conditions
    胱氨酸的质量控制——如何通过工艺操作来实现
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    The Effect of PP Structure under the Different Oxidizing Conditions
    PP老化形式对结构的影响
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    Study on the Pre-oxidation of Pitch Fibre (Ⅱ)──the Investigation of Stabilization Conditions
    沥青纤维的预氧化研究(Ⅱ)──对氧化规律的探索
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  conditions
As a consequence, the action is linearizable if certain topological conditions are satisfied.
      
An algebraicG-varietyX is called "wonderful", if the following conditions are satisfied:X is (connected) smooth and complete;X containsr irreducible smoothG-invariant divisors having a non void transversal intersection;G has 2r orbits inX.
      
Here we provide certain conditions (more general than those in [Ka1]) which guarantee preservation of the topology under a modification.
      
We express the vanishing conditions satisfied by the correlation functions of Drinfeld currents of quantum affine algebras, imposed by the quantum Serre relations.
      
We discuss the relation of these vanishing conditions with a shuffle algebra description of the algebra of Drinfeld currents.
      
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Aureomycin (Ⅰ) on reduction with zinc-acetic acid gives desdimethylaminoaureomycin (Ⅱ) under mild conditions and desdimethylaminodesoxyaureomycin (Ⅲ) under more drastic conditions. Ⅱ can be converted into Ⅲ by further reduction. Treatment of Ⅰ, Ⅱ or Ⅲ with concentrated hydrochloric acid or methanolic HCl produces anhydroaureomycin (Ⅳ), desdimethylaminoanhydroaureomycin (Ⅴ) or desdimethylaminodes- oxyanhydroaureomycin (Ⅵ) respectively. Compound (Ⅴ) can be obtained from Ⅳ by hydrogenolysis, and,...

Aureomycin (Ⅰ) on reduction with zinc-acetic acid gives desdimethylaminoaureomycin (Ⅱ) under mild conditions and desdimethylaminodesoxyaureomycin (Ⅲ) under more drastic conditions. Ⅱ can be converted into Ⅲ by further reduction. Treatment of Ⅰ, Ⅱ or Ⅲ with concentrated hydrochloric acid or methanolic HCl produces anhydroaureomycin (Ⅳ), desdimethylaminoanhydroaureomycin (Ⅴ) or desdimethylaminodes- oxyanhydroaureomycin (Ⅵ) respectively. Compound (Ⅴ) can be obtained from Ⅳ by hydrogenolysis, and, similarly, Ⅵ from either IV or V. All the above compounds, (Ⅰ), (Ⅱ), (Ⅲ), (Ⅳ), (Ⅴ) and (Ⅵ), when subjected to zinc dust distillation, form naphthacene. A comparison of the ultra-violet absorption spectra of Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ and Ⅵ affords a supplementary evidence for the location of the angular-OH group in the structure of aureomycin.

金黴素(I)在冰醋酸與甲醇溶液中,用鋅粉氫解,在温和條件下,產生脫二甲胺金黴素(II);較劇烈條件下,則生成脫二甲胺脫羥金黴素(III)。III從II經鋅粉醋酸氫解得到。 I,II,III分別與濃鹽酸或甲醇鹽酸處理相應地得到脫水金黴素(IV),脫二甲胺脫水金黴素(V)及脫二甲胺脫羥脫水金黴素(VI)。脫水金黴素(IV)經鋅粉醋酸氫解亦產生V與VI。VI亦可從V製成。 I,II,III,IV,V或VI和鋅粉共同蒸餾,皆得到并四苯。 從紫外吸收光譜測定,對金黴素結構中二甲胺基及角羥基的位置有補充的說明。

In the present investigation, water in bleaching powder was found to play a leading role in determining the stability of the latter. In order to compare the stability of various samples of bleaching powder, we determined the content of the available chlorine before and after a sample kept in a small glass-stoppered tube at 90℃ for 8 hours. The ratio of residual to the original content of available chlorine when expressed in percentage is defined as the index of stability.The samples of bleaching powder and raw...

In the present investigation, water in bleaching powder was found to play a leading role in determining the stability of the latter. In order to compare the stability of various samples of bleaching powder, we determined the content of the available chlorine before and after a sample kept in a small glass-stoppered tube at 90℃ for 8 hours. The ratio of residual to the original content of available chlorine when expressed in percentage is defined as the index of stability.The samples of bleaching powder and raw calcium hypochlorite investigated in our work contain-ed in the main the following components: Ca(Ocl)_2(S), Ca(OCl)_2·3H_2O(S), CaCl_2·6H_2O(S)and CaCl_2·Ca(OH)_2·H_2O(S). When bleaching powder or raw calcium hypochlorite was thoroughly dried under a vapor pressure of 0.1 mm. Hg at 25°, two of the components were dehydrated according to the following reactions (Figure 5): Ca(OCl)_2·3H_2O(S) = Ca(OCl)_2(S) + 3H_2O(~5mm. Hg) CaCl_2·6H_2O(S)=CaCl_2·H_2O(S) + 5H_2O(~1.0 mm. Hg) and the index of stability attained 100% (Figures 6 and 7). Water which can be removed from a sample under the above conditions is defined as removable water. By the control of amount of the removable water in a sample, the index of stability can be made to vary between 0 to 100%.If we take the percentage of the available chlorine decomposed in an hour at 90 as the rate of decomposition (D %/hr.), the latter seemed to vary linearly with the amount of removable water (W %) (Figure 8). When the samples were heated in a stoppered tube to 90° from 25°, the removable water probably redistributed according to the following scheme: xCa(OCl)_2(S) + y Ca(OCl)_2·3H_2O(S) + z CaCl_2·6H_2O(S) 25° xCa(OCl)_2(S) + (y + (5z)/3) Ca(OCl)_2·3H_2O(S) + z CaCl_2·H_2O(S) 90° Inasmuch as the thoroughly dried samples did not decompose considerably even at 90°, the decomposition of OCl~- seemed to take place almost exclusively in the phase Ca(OCl)_2·3H_2O(S). The linear relationship of D vers. W indicated that the decomposition rate of a sample varied linearly with its content of the component Ca(OCl)_2·3H_2O(S) at 90°. In the light of the above results, an explanation was proposed to account for the decomposition of bleaching powder under the conditions of storage.

本工作肯定,水在漂白粉的稳定性问题中具有极其重要的作用.漂白粉和漂粉精样品在0.1毫米汞柱的蒸气压下可脱去的水称为可脱水.在90°下八小时后样品中有效氯量占原有效氯量的百分数称为其稳定度.稳定度测值指出,样品的可脱水率从0%递增时,其稳定度则从100%递减至0%.根据吸水率-蒸气压图等数据,样品的可脱水主要分布在物相Ca(OCl)_2·3H_2O(S)和CaCl_2·6H_2O(S)中,而在90°下,全部可脱水则集中至前一物相.样品有效氯成分的分解主要在Ca(OCl)_2·3H_2O(S)中,而在Ca(OCl)_2(S)中分解很少.稳定度的数据指出,在90°下,样品有效氯分解率与其中可脱水率成正比,从而亦与其中物相Ca(OCl)_2·3H_2O(S)的含率成正比. 根据上述,作者并从生产实践的意义讨论了漂白粉的稳定性问题.

Design data for high purity toluene recovery from platformate by extractive distillation with phenol, were obtained by a pilot plant study. The extractive distillalations column, 200mm in diameter, possessed 44 bubble cap plates and had a Capacity o?processing 250 kilograms of feed per day. The platformate was first prefractionated to 70-117℃, which contained 0.8% benzene and 48% toluene by weight. The heart cut was then used as the feed for the extractive distillation. The recommended operating conditions...

Design data for high purity toluene recovery from platformate by extractive distillation with phenol, were obtained by a pilot plant study. The extractive distillalations column, 200mm in diameter, possessed 44 bubble cap plates and had a Capacity o?processing 250 kilograms of feed per day. The platformate was first prefractionated to 70-117℃, which contained 0.8% benzene and 48% toluene by weight. The heart cut was then used as the feed for the extractive distillation. The recommended operating conditions were as follows: phenol/feed ratio, 4; reflux ratio, 4-5; feed temperature, 120℃; phenol inlet temperature, 130℃. The actual plates of rectifying, stripping and phenol recovery section were 19, 20 and 5 respectively. The recovery of nitration grade toluene from the feed was 97-98%. When losses in prefractionation, acid washing and redistillation were included, the net recovery of toluene from the platformate was 93%. The result of this study gave the data for designing of full scale production plants.

为了提供以苯酚为溶剂用抽提蒸馏法从铂重整生成油中抽取纯甲苯的工业装置设计依据和操作条件,进行了日处理量为250公斤的中型试验。抽提蒸馏塔为一直径200毫米,拥有44个塔盘的泡帽塔。铂重整生成油先经预分馏切割成70—119℃馏份,其中苯含量为0.8%(重量),甲苯含量为48%(重量)。然后将该馏分进行抽提蒸馏,合理操作条件为酚油比4:1(体积比);回流比4.5;油进口温度120℃;酚进口温度130℃。精馏段塔盘数为19,汽提段塔盘数为20,酚回收段塔盘数为5。产品经酸碱洗涤和再蒸馏后为硝化级纯度的甲苯,抽提蒸馏的甲苯收率可达97—98%(重量)。如包括预分馏损失,则甲苯的收率为96%(重量)。酸碱洗涤和再蒸馏损失一般可按3%计,因此,纯甲苯净收率为93%(重量)。试验结果提供了工业装置的设计数据。

 
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