查询词典 acetic acid amide

The yield of coumarin could be reached up to 86.6% with lower consumption of acetic anhydride in case the total molar ratio of acetic anhydride to salicylaldehyde=1 9∶1 and the reaction was...

水杨醛与乙酸酐的总摩尔比为 1∶1.9，反应近终点时在( 2 14± 2 )℃保温反应 0 。5h，香豆素收率达 86.6%。

The yield of coumarin could be reached up to 86.6% with lower consumption of acetic anhydride in case the total molar ratio of acetic anhydride to salicylaldehyde=1.9∶1 and the reaction was kept 0.5 h at 212～216 ℃ when the reaction was close to the end.

水杨醛与乙酸酐的总摩尔比为1∶1 。9，反应近终点时在(214±2)℃保温反应0.5 h，香豆素收率达86.6%。

Results showed that extraction abilities depends on the hydrophobic of solutes which pK〓 values are similar, e. g. acetic, propionic, butyric and valeric acids, while pK〓 values affect dominantly the extraction abilities of acids with similar hydrophobic, e. g. formic, acetic, chloroacetic, dichloroacetic, and trichloroacetic acids. Meanwhile, diluents and TOA concentration also affect the extraction equilibria of acids through the specific basicity of TOA .

TOA对酸性差别很小的一元羧酸如乙酸、丙酸、丁酸、戊酸的萃取能力主要取决于羧酸的疏水性参数logP；TOA对疏水性参数差别较小的羧酸如甲酸、乙酸、一氯乙酸、二氯乙酸、三氯乙酸的萃取能力主要取决于羧酸的电性参数；稀释剂的种类、TOA的浓度都会影响TOA的表观碱度pH〓，并通过TOA的表观碱度影响羧酸的萃取平衡。

In this study, we would compare with cleaning efficiency between citric acid and acetic acid.

在本论文中，我们将比较柠檬酸和醋酸移除铜离子的能力。

We also compare the effect between acetic acid and citric acid.

此外还比较了乙酸和柠檬酸的酸解效果。

Eight kinds of solid acid catalysts for esterification of acetic acid and isopentyl alcohol are studied in this paper.

本文研究了8种固体酸催化剂催化乙酸与异戊醇的酯化反应，结果表明：FeCl3。

The effects of water,free fatty acid,and acetic acid in the reaction system on the reaction were systematically studied.

系统研究了反应体系中的水、游离脂肪酸和乙酸对反应的影响。

The ester of salicylic acid and acetic acid, it inhibit s production of prostaglandins in the body.

系水杨酸和醋酸的酯，会抑制前列腺素的生成。

The ester of salicylic acid and acetic acid, it inhibits production of prostaglandins in the body.

系水杨酸和醋酸的酯，会抑制前列腺素的生成。

Methods Salicylic acid and acetic anhydride were used as the raw materials, with concentrated sulfuric acid as the catalyst.

目的 建立乙酰水杨酸的快速合成方法。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48