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esterification
相关语句
  酯化
     Studies on SO_4~(2-)-MoO_3-ZrO_2 Solid Superacid Catalyst and Pervaporation Membrane Seperation Esterification
     SO_4~(2-)-MoO_3-ZrO_2固体超强酸催化剂以及渗透汽化膜分离酯化反应的研究
短句来源
     MECHANISM OF HYDROGEN ION CATALYSIS IN ESTERIFICATION. Ⅵ. STUDIES ON THE KINETICS OF POLYESTERIFICATION REACTIONS OF 1-HYDROXYPENTADECANOIC ACID-15.
     酯化反应的氢离子催化机构——Ⅳ 1—羟基十五碳酸的聚酯反应动力学
短句来源
     THE RELATIONSHIP BETWEEN THE ESTERIFICATION REACTION CONSTANT AND THE PHYSICAL PARAMETERS OF THE METAL ATOM OF THE CATALYZER
     酯化反应常数和催化剂金属离子物理参数的关系
短句来源
     STUDY OF ESTERIFICATION REACTIONS CATALYZED BY HYDRATED SULPHATE SALTS Ⅰ. DETERMINATION OF THE ORDER AND THE ACTIVATION ENERGY OF REACTION AND THE ACTIVITY OF CATALYSTS
     硫酸盐水合物催化下的酯化反应 Ⅰ.反应级数、活化能及催化剂活性的测定
短句来源
     STUDY OF ESTERIFICATION REACTIONS CATALYZED BY HYDRATED SULPHATE SALTS Ⅱ. A CATALYZING LINEAR FREE-ENERGY RELATIONSHIP
     硫酸盐水合物催化下的酯化反应 Ⅱ.催化线性自由能方程
短句来源
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  酯化反应
     MECHANISM OF HYDROGEN ION CATALYSIS IN ESTERIFICATION. Ⅵ. STUDIES ON THE KINETICS OF POLYESTERIFICATION REACTIONS OF 1-HYDROXYPENTADECANOIC ACID-15.
     酯化反应的氢离子催化机构——Ⅳ 1—羟基十五碳酸的聚酯反应动力学
短句来源
     THE RELATIONSHIP BETWEEN THE ESTERIFICATION REACTION CONSTANT AND THE PHYSICAL PARAMETERS OF THE METAL ATOM OF THE CATALYZER
     酯化反应常数和催化剂金属离子物理参数的关系
短句来源
     STUDY OF ESTERIFICATION REACTIONS CATALYZED BY HYDRATED SULPHATE SALTS Ⅰ. DETERMINATION OF THE ORDER AND THE ACTIVATION ENERGY OF REACTION AND THE ACTIVITY OF CATALYSTS
     硫酸盐水合物催化下的酯化反应 Ⅰ.反应级数、活化能及催化剂活性的测定
短句来源
     STUDY OF ESTERIFICATION REACTIONS CATALYZED BY HYDRATED SULPHATE SALTS Ⅱ. A CATALYZING LINEAR FREE-ENERGY RELATIONSHIP
     硫酸盐水合物催化下的酯化反应 Ⅱ.催化线性自由能方程
短句来源
     Esterification of δ-Ketonic Acids
     δ-酮酸的酯化反应
短句来源
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  酯化作用
     The esterification of chloroacetic acid with alcohols using SnCl4·5H2O/C as catalyst was studied.
     研究了SnCl4·5H2O/C催化合成氯乙酸和醇的酯化作用
短句来源
     The esterification of cinnamic acid and cyclohexyl alcohol catalyzed by ferric chloride hydrate(FeCl 3·6H 2O) was studied, and the optimum conditions were acid∶alcohol=1∶10(mol), the amount of the catalyst 0.185 mol. (to 1 mol cinnamic acid), the reaction time 2.0 h and the conversion rate of cinnamic acid 73.4%
     研究了氯化铁催化下肉桂酸和环己醇的酯化作用,得出优惠条件是:酸醇比为1∶10(mol),催化剂用量为0.185mol(对1mol肉桂酸),反应时间2.0h,肉桂酸转化率为73.4%。
短句来源
     Cross-linking and esterification both decreases the moisture absorption of CMD at extent of 26.5% and 12.1% respectively,while their synergistic extent is 33.7%.
     交联和酯化作用都可以降低CMD的吸湿性,降幅分别为26.5%和12.1%,两者协同作用降幅为33.7%。
短句来源
     Study on Catalytic Esterification of Ferric chloride
     氯化铁催化酯化作用的研究
短句来源
     Based on the composion of iso-amyl actate by using solid superacidic as catalyst,acetic acid and iso-amyl alcohol as materials,the optium conditions were discussed,the ratio of esterification reached over 90% when molar rate nacetic acid∶niso-amyl aicohol∶nsolid superacidic=1.8∶1∶2.
     本文讨论了固体超强酸SO42-/C-Al2O3代替硫酸作为酯化作用的催化剂,催化合成乙酸异戊酯,当n乙酸∶n异戊醇∶n固化酸=1.8∶1∶2,合成酯的产率高达90%以上.
短句来源
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  “esterification”译为未确定词的双语例句
     APPLICATION OF LD-412 SOLID ACID CATALYST IN THE ESTERIFICATION OF ACRYLIC ACID
     LD—412固体酸催化剂在丙烯酸酯化反应中的应用
短句来源
     THE CATALYSIS OF LD412 SOLID ACID IN THE ESTERIFICATION OF PRIMARY POLYOLS AND ACRYLIC ACID
     LD412固体酸催化剂在多元伯醇—丙烯酸酯化反应中的催化作用
短句来源
     Catalytic Esterification of Carboxylic Acid with Solid Acids (Ⅰ)
     用固体酸催化羧酸酯化反应(Ⅰ)
短句来源
     Catalytic Esterification of Carboxylic Acid with Solid Acid(Ⅱ)
     用固体酸催化羧酸酯化反应(Ⅱ)
短句来源
     The Reaction Model for the Esterification of Acetic Acid with Propene in Gas-Liquid System Catalyzed by Heteropolyacid
     杂多酸为催化剂的丙烯与醋酸气-液酯合成的反应模型初探
短句来源
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  esterification
Rosin glycerin ester and its bromide were prepared from natural renewable rosin, glycerin and liquid bromine which were first subjected to an esterification reaction, followed by an addition reaction.
      
The catalytic activities of the solid acids were evaluated by esterification of acetic acid and butanol and the results were compared with those catalysts prepared at normal conditions.
      
Results show that PEG400 can be grafted onto the surface of the films via esterification with SMA.
      
Dimethyl 4,6-bis(bromomethyl) isophthalate was synthesized by bromomethylation, oxidation, esterification and bromination of 1,3-dimethylbenzene.
      
These substances are products of enzymatic esterification of sugars followed by their dehydration by heat treatment or long seasoning of grape wines.
      
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As a model experiment for the synthesis of A, B rings of tetracyclines, thesynthesis of 9-hydroxydecalin-1, 3-dione (VIII) is reported. Ethyl 2-ethynyl-2-hydroxycyclohexaneacetate (III), b. p. 105--7°/0.1mm, and its corresponding acid(IV), m. p. 100--1°, were obtained by the ethynylation of ethyl cyclohexanone-2-acetate (II). Hydration of III, followed by hydrolysis, gave 2-acetyl-2-hydroxycyclohexaneacetic acid (V), m. p. 115--7°. which on esterification withdiazomethane yielded its methyl ester (VI),...

As a model experiment for the synthesis of A, B rings of tetracyclines, thesynthesis of 9-hydroxydecalin-1, 3-dione (VIII) is reported. Ethyl 2-ethynyl-2-hydroxycyclohexaneacetate (III), b. p. 105--7°/0.1mm, and its corresponding acid(IV), m. p. 100--1°, were obtained by the ethynylation of ethyl cyclohexanone-2-acetate (II). Hydration of III, followed by hydrolysis, gave 2-acetyl-2-hydroxycyclohexaneacetic acid (V), m. p. 115--7°. which on esterification withdiazomethane yielded its methyl ester (VI), m. p. 37--8°. The latter was cyclizedby sodium methoxide to form 9-hydroxydecalin-1, 3-dione (VIII), m. p. 182--3°,which showed characteristic concentration-dependent ultraviolet absorptionspectra of cyclic 1, 3-diketones. On treatment with concentrated hydrochloricacid or methanolic HCl, VIII gave 1, 3-dihydroxy-5, 6, 7, 8-tetrahydronaphthalene(IX) or 1, 3-dimethoxy-5, 6, 7, 8-tetrahydr (X) respectively. On the basis of the stability of the two γ-hydroxy acids, IV and V, andthe difficulty of lactonization of the latter, cis fusion of the two rings incompound VIII is assigned.

本文报告四圜素类抗生素A,B环的模型化合物9-羟基十氢萘-1,3-二酮(Ⅷ)的合成。Ⅱ起乙炔基化反应後,得到Ⅲ与Ⅳ。Ⅲ先经水化反应,继以水解,产生V。V与重氮甲烷作用生成Ⅳ,後者用无醇甲氧钠处理即环化而成Ⅷ。Ⅷ经浓盐酸脱水生成Ⅸ,经甲醇氯化氢处理生成Ⅹ。并推测Ⅷ的二个环是顺位相联接。

Although esterification reaction betweea monobasic acids and mouohydric alcohols is a well-known chemical reaction,on which various authors,such as Goldschmidt,Hinshelwood,Flory and others,have done much work,but the mechanism of esterification and the order of the reaction in the absence or presence of a foreign acid remain unclarified.For this purpose we have studied the kineties of esterification reactions between laurie acid and normal octyl alcohol with equi-or non-eqnimolar quantity ratios...

Although esterification reaction betweea monobasic acids and mouohydric alcohols is a well-known chemical reaction,on which various authors,such as Goldschmidt,Hinshelwood,Flory and others,have done much work,but the mechanism of esterification and the order of the reaction in the absence or presence of a foreign acid remain unclarified.For this purpose we have studied the kineties of esterification reactions between laurie acid and normal octyl alcohol with equi-or non-eqnimolar quantity ratios in the absence or presence of a foreign acid at different temperatures.According to our experimental data,we propose the following mechanism for the esterification reaction between monobasic acids and monohydri calcohols:

本文建议一种新的酯化反应的氢离子催化机构,这机构与公认的酯化反应的氢离子催化机构的区别在于氢离子的来源和氢离子参与反应的详细历程,肯定氢离子不仅由外酸供给,而且也可由单元酸本身电离得来,另外,单元酸和单元醇都可作为氢离子的载体。酯化反应的功力学方程与单元酸和单元醇起始的克分子比有密切关系,应由(3)式表示。当酸与醇以等克分子比起反应,在无外酸作催化剂时,酯化反应是2(1/2)级反应;若有外酸作催化剂,当外酸的量加得适当多,由单元酸本身供给的氢离子的贡献可以忽略时,是二级反应;当外酸的量加得少,由单元酸本身供给的氢离子的贡献不可以忽略时,它不再是二级反应。当酸与醇以不等克分子比起反应,动力学方程比较复杂,实验结果亦与理论相一致。这样,我们用同一反应机构解释所有不同克分子比的单元酸与单元醇的酯化反应的实验数据。

Much experimental studies on the polyesterification reactions between dibasic acids and glycols have been reported by various authors,among them Menshytkir,Dostal and Raff,Flory,Rafikov and Korshak,Davies,Colonge and Stuchlik,and others,but quite diversed results were obtained.According to Flory,polyesterification in the absence of a foreign acid,owing to catalytic effect of the dibasic acid molecule,is a third-order reaction.Other authors pointed out that,polyesterification should be a bimolecular reaction...

Much experimental studies on the polyesterification reactions between dibasic acids and glycols have been reported by various authors,among them Menshytkir,Dostal and Raff,Flory,Rafikov and Korshak,Davies,Colonge and Stuchlik,and others,but quite diversed results were obtained.According to Flory,polyesterification in the absence of a foreign acid,owing to catalytic effect of the dibasic acid molecule,is a third-order reaction.Other authors pointed out that,polyesterification should be a bimolecular reaction of second-order,or second-order in the early stage and third-order in the later stage of the reac- tion.In this work,we attempted to show that,polyesterification between dibasic acid and glycol is as well as esterification between monoacid and monoalcohol,provoked by the catalysis of hydrogen-ion.When the dibasic acid and the glycol react in equi-molar quantity ratio in the absence of a foreign acid,the hydrogen-ions come from the ionization of the dibasic acid itself,and in consequence the concentration of hydrogen-ion is proportional to the square root of the concentration of the dibasic acid,polyesterification is a 2~1/_2-order reaction.On the other hand,in the presence of a foreign acid,the order of reacton varied continuously from one extreme ease of 2~1/_2-order to another extreme case of second order according to whether the concentration of hydrogen ion derived from the foreign acid or the dibasic acid may be neglected.All our experimental results of polyesterification reactions either between sebacic acid and ethylene glycol,sebacic acid and diethylene glycol,adipic acid and hexamethylene glycol,and sebacic acid and hexamethylene glycol in the absence of foreign acid at different temperatures,or between adipic acid and ethylene glycol in the presence 0.41,0.82,1.23,2.05,4.10 and 12.30.10~(-3) mole of sulfuric acid per kilogram as catalyst at 140℃,are in good agreement with this proposed mechanism.Data of other authors were re-examined on the basis of our proposed mechanism of hydrogen ion catalysis in esterification and were all found to conform to the 2~1/_2-order relationship.Thus,the views by earlier workers that polyesterification is catalyzed by the dibasic acid molecule itself or that it is a simple second-order reaction,or a second-order in the early stage and a third-order in the later stage of the reaction,all are refuted and the long disputed question of the order of polyesterification is assumed to be clarified.

聚酯反应象单元酸与单元醇的酯化反应一样,都是氢离子催化机构。这种机构与现在公认的聚酯反应的氢离子催化机构的区别在于氢离子的来源和氢离子参与反应的详细历程,肯定了氢离子不仅由外酸供给,而且也可由二元酸本身供给。另外,二元酸与二元醇均可作为氢离子的载体。聚酯反应的动力学方程与二元酸与二元醇的起始克分子比有密切关系,应由前篇(3)式表示。当酸与醇以等克分子比起反应,又无外酸存在时,聚酯反应是2(1/2)级反应;若有外酸作催化剂时,当外酸的量加得适当多,由二元酸本身供给的氢离子的贡献可以忽略时,是二级反应,与以往结论相一致:当外酸的量加得少,必须考虑氢离子的同离子效应,它就不再是简单的二级反应,当酸与醇以不等克分子比起反应我们的实验结果亦与理论一致。

 
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