在反应过程中，乙二酸总是会生成的。
在反应过程中，乙二酸总是会生成的。
乙二酸的质量浓度在夏、秋季高于春、冬季。
The concentrations of oxalic acid in summer and autumn were higher than those in spring and winter.
方法采用乙二酸四醋酸二钠滴定方法测定铋离子和铝离子；
Method Bismuth and aluminum were detected by titration with EDTA.
研究了不同浓度下乙二酸对元素电感耦合等离子体质谱行为的影响。
The influence of different concentration of oxalic acid on elemental inductively coupled plasma mass spectrometry has been investigated.
研究了不同浓度乙二酸介质对元素电感耦合等离子体质谱行为的影响。
The influence of different concentration of oxalic acid matrix on elemental inductively coupled plasma mass spectrometry was investigated.
简述了丙二酸二乙酯的生产和合成技术，详细介绍了它在有机合成中的广泛用途。
Sketch diethyl malonate production and synthetic technology of ester, introduce it's extensive use in the organic synthesis in detail.
芦竹碱和乙酰氨基丙二酸二乙酯在碱性条件下缩合，得缩合物。
Under the alkali conditions, the gramine condension with diethyl acetamidomalonate to obtain the condensation compound.
主香成分为乙酸龙脑酯、水杨醛、丙二酸二乙酯、亚麻酸乙酯等30个化合物，占芳香油总量的76 95 %。
The 30 main compounds are bornyl acetate , salicylic aldehyde, diethyl malonate, ethyl linolenate, etc, which amount to 76.95 % content of the oil.
以富马酸和乙醇为原料，硫酸氢钠作催化剂合成富马酸二乙酯。
Diethyl fumarate was synthesized with fumaric and alcohol as raw materials and sodium acid sulfate as catalyst.
以己二酸二乙酯为原料，经狄克曼反应合成2-羰环戊基甲酸乙酯。
Synthesis of 2-(ethoxycarbonyl) cyclopentanone by Dieckmann reaction with diethyl adipate as raw material was studied.
实验以水杨醛、丙二酸二乙酯为原料，乙醇钠为催化剂催化合成香豆素- 3 -羧酸乙酯，再经皂化、酸解环合合成香豆素- 3 -羧酸。
Synthesis of coumarin-3-carboxylic acid through sodium ethoxide catalyzed synthesis of coumarin -3-carboxylic acid ethyl ester, followed by saponification, acidolysis cyclization was studied.
研究了由已二酸二乙酯与水合肼反应合成己二酰二肼。再用乙酸酐酰化己二酰二肼得到金属减活剂N。
Metal deactivator N, N'-Di-acetyladipic dihydrazine was prepared by reacting diethyl adipate with hydrazine hydrate, and then was treated with acetic anhydride.
以对苯胺、丙二酸二乙酯为原料、吡啶为溶剂合成N，N'-二苯基丙二酰胺的方法进行了研究。
The method of synthesizing N, N′-diphenylmalonamide employing aniline and malonic ester and pyridine as extractant was investigated.
根据缩合原理，研究并提出了“克兰逊”催化缩合法，通过特性触煤合成了乙氧基甲叉基丙二酸二乙酯产品，提高了产品质量及回收率。
Through the peculiarity contact-coat, composes the ethoxy methylene propane dioic acid dio-ethylest which improves the quality and yield of the product.
以溴代环己烷和苯甲酸乙酯为原料，经过两步反应合成了甲基丙烯酸二环己基苯甲酯。
With bromocyclohexane and ethyl benzoate as raw materials, dicyclohexylphenylmethyl methacrylate was synthesized by two steps.
用重结晶方法得到了羟基乙叉二膦酸的单晶，通过单晶x -射线衍射技术测定了晶体的结构，并用红外光谱和核磁共振波谱对其进行了表征。
The single crystal of HEDP was obtained through recrystallization method, which was characterized by single crystal X-ray diffraction technique, infrared and NMR spectroscopy.
丙二酸二乙酯和芳烃在三乙酸锰和磷酸作用下也能发生同样的反应。
The reaction of malonic ester with aro-matics can also be carried out by above reagents.
考察了一种以丙烯酸乙酯为第二单体的新型腈纶的热性能和染色性能。
Dyeing properties and thermal performance of a novel PAN fiber with ethyl acrylate as the second monomer were discussed.
选择甲基丙烯酸二甲基氨基乙酯来改性丙烯酸树脂，获得带有反应性氨基的丙烯酸树脂，进而制备了改性丙烯酸环氧粉末涂料。
By using dimethylamino ethyl methacrylate to modify acrylate resin, we acquired a new type of acrylate resin with reactive amino group. Further, we engineered a modified acrylic-epoxy powder coating.
产品成份：去离子水、丙二醇、丙烯酸聚合物、西曲氯铵、木瓜提取液、海藻提取液、DMDM乙内酰脲、香料。
Ingredients: Deionized Water, Propylene Glycol, Acrylic Acid Copolymer, N-Hexadecyltrimethylammonium Chloride, Papaya Extract, Alga Extract, DMDM Hydantoin, Essence.
论述了以丁二酸、无水乙醇为原料，离子交换树脂，催化合成丁二酸二乙酯的新工艺。
Taking succinic acid, alcohol as material, cation exchange resin as catalyst the diethyl succinate is synthesized.
产品成分：去离子水、丙二醇、丙烯酸聚合物、西曲氯铵、木瓜提取液、甘草提取液、DMDM乙内酰脲、香料。
Ingredients: Deionized Water, Propanediol, Acrylic Acid Polymer, N-Hexadecyltrimethylammonium Chloride, Pawpaw Extract, Melarrest l, DMDM Hydantoin, Essence.
结果表明：以己二酸和乙腈组合为催化剂的催化效果最好。
The results show that the combination of adipic acid and acetonitrile is the best catalyst.
葡萄酒主要的香气成分如琥珀酸二乙酯、苯乙醇、辛酸、葵酸，在污染酒样中比例显著减低，甚至未检出。
The main flavoring compositions including diethyl succinate, phenylethanol, octanoic acid and decanoic acid in contaminated grape wine decreased evidently and even not detected.
以甘氨酸、甲醛、亚磷酸二乙酯为主要原料，合成甘氨酸二亚甲基膦酸(GDMP)。
Glycine dimethyl phosphoric acid (GDMP) has been synthesized with glycine, formaldehyde and diethyl phosphite as main raw materials.
方法：以空白丸芯、柠檬酸三乙酯、滑石粉、硬脂酸镁、胶体二氧化硅、聚维酮K30等为骨架材料制备吲达帕胺缓释胶囊；
Methods: Using eudragitrs 100, triethyl citrate, hydrated magnesium silicate, magnesium stearate, silicic acid anhydride, povidone K30 and etc as capsules preparation materials.
本文研究了以丙酰丙酮酸乙酯、 硫酸二胺和硫酸钾为原料合成吡螨胺中间体3-乙基-5- 吡唑羧酸乙酯的方法。
It is reported that ethy1 3-ethyl-5-pyrazole- carboxylate, an intermediate for tebufenpyrad, was synthesized by using ethyl propionyl acetonate and others as starting materials.
本文研究了以丙酰丙酮酸乙酯、 硫酸二胺和硫酸钾为原料合成吡螨胺中间体3-乙基-5- 吡唑羧酸乙酯的方法。
It is reported that ethy1 3-ethyl-5-pyrazole- carboxylate, an intermediate for tebufenpyrad, was synthesized by using ethyl propionyl acetonate and others as starting materials.
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