查询词典 acetic aldehyde

N-methylacetamide was used as entrainer in separating acetic acid from water with extractive distillation ,and the interaction mechanism in this process was studied by using the density functional theory.

文献[1-4]认为萃取精馏分离乙酸水溶液过程中萃取剂与乙酸之间的氢键作用改变了溶液中乙酸和水的活度系数关系，从而改变了两者之间的相对挥发度，使得水和乙酸的分离变得相对容易。

The results show that the yield of butyl acetate using the catalysts prepared with the concentration of H2SO4 by 0.5 mol·l-1 and the calcination temperature of 550℃ is the best,which is up to 52.5% when the molar ratio of butyl alcohol to acetic acid is 1:1.3 and without addition of entrainer in the hermetic reactor.

结果表明采用硫酸浸渍液浓度为0.5mol/L，焙烧温度为550℃时所制备的催化剂在正丁醇和乙酸的物质的量比为1.3及不添加任何带水剂的密闭条件下酯化效果最好，酯化率为52.5%。

Particular reaction for the esterification of acetic acid and menthol is carried out.

对於醋酸与甲醇的酯化特定反应被推导出。

The acetic ether extract has obvious antibacterial effect, also has broad-spectrum antibacterial activity.

了哥王乙酸乙酯提取物抑菌效果显著，具有广谱抗菌作用。

The antibacterial activities of the acetic ether extract were analyzed with bacteria and fungus. Results showed this extract can suppress the growth of Staphylococcus aureus、S.

该浸膏对多种微生物的生长具有明显的抑制作用，其中对细菌Staphylococcus aureus、S。

Objectives: Through studying the distribution of Sppan acetic ether extract in donor's hearts of rats and its effect on IL-1β in blood, to approach the distribution target ability of sappan in donor's hearts, and its possible immune resist mechanism.

目的：通过研究苏木乙酸乙酯提取物在同种异位心脏移植大鼠供体心脏的分布情况和对小鼠外周血IL-1β活性影响，探讨苏木免疫活性部位在供体心脏分布的选择性及其免疫抑制作用机理。

A method for determining contents of seven kinds of residual organic solvents such as methanol, ethanol, methylene chloride, ethyl aetate, toluene, tetrahydrofuran and acetic acid in a new pharmaceutical-developing (UP0044) was established by capillary gas chromatography.

建立了测定新药UP0044中甲醇、乙醇、二氯甲烷、乙酸乙酯、甲苯、四氢呋喃、乙酸7种有机溶剂含量的方法，以确定它们在药物中的残留量和比例。

Only formic, lactic, acetic, and oxalic acids, menthol, thymol, eucalyptol, and camphor may be used for Varroa control

只有蜂酸、乳酸、醋酸、草酸、薄荷醇、麝香草酚、桉油精和樟脑可被用于Varroa 控制。

Formic acid, lactic acid, acetic acid, oxalic acid, menthol, thymol, eucalyptol or camphor are used preferably to chemically synthetised products in cases of infestation with Varroa jacobsoni.

万一受到蜂螨群袭，蚁酸、乳酸、醋酸、草酸、薄荷醇、麝香草酚、桉油精或樟脑的使用优先于化学合成的药品。

The paper introduces method and step of determination formic acid and acetic acid in exhaust gas by ion chromatography.

阐述了离子色谱法测定废气中甲酸、乙酸含量的方法和步聚。

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