查询词典 esterification

The yield of esterification was more than 98 under above conditions.

该催化剂具有催化活性高、不污染环境、可重复使用等特点。

In recent progress in chemical modification of hemicelluloses has been reviewed in this article,including esterification and etherification.

对近十年半纤维素的化学改性如：醚化改性、酯化改性进行了综述，主要从多相反应和均相反应两个方面进行了归纳说明，最后提出了半纤维素改性的前景。

This article provided a new route to produce 4-dimethoxy phenethylamine. In basic condition, the product could be obtained through etherization, bromation, Grignard reaction, hydroxyethylation, esterification and Gabriel reaction with phenol as raw material, the overall yield is 45.0%.

提出了合成4-甲氧基苯乙胺的新方法，即在碱性条件下，苯酚首先与硫酸二甲酯反应，再选用高选择性的溴化剂溴化后，经格氏反应、羟乙基化反应和酯化反应，最后经Gabriel反应可以制备目标产物，反应总收率为45.0%。

After esterification, the ethyl-2-chloro-3-phenylpropionate reacts with diethyl malonate under the catalysis of sodium ethylate, and we obtain the corresponding triethyl ester. The-benzylsuccinic acid is formed by the triethyl ester reacting with concentrate hydrochloric acid and taking place hydrolyzation and decarboxylation reaction at the same time. In order to avoid the formation of cinnamic acid, the sodium ethylate and diethyl malonate must be react sufficiently. The course has simple operation, inexpensive materials and better yield.

具体制备工艺为：首先以L-苯丙氨酸为原料采用重氮化方法得到-2-氯-3-苯基丙酸，再经酯化得到-2-氯-3-苯基丙酸乙酯后在乙醇钠催化作用下和丙二酸二乙酯缩合，发生SN2反应，得到相应的三乙酯，然后经水解和脱羧，得到-苄基丁二酸；在实验中乙醇钠要和丙二酸二乙酯充分反应，避免生成肉桂酸乙酯；该过程操作简单，原料便宜，产率较高，总收率可达到26.8%。

Ink pH value addition to these factors, paper and plastic surface and the surface of fabric surface, such as paper in production when sizing agent used in the fireclay esterification, and each has its characteristics, and so the printer carrier pH on the ink or ink drying, luster also contributed.

水墨pH值除上述因素外，纸表面、塑表面、织物表面（如纸在生产时施胶剂中所用的松香酯、粘土等并各有其特性）等承印载体pH值对油墨或干燥、光泽的水墨也有影响。

The reaction time, reaction temperature and catalyst influencing on esterification were investigated, and the acid value, flashing point and other properties were determined.

考察了反应时间、反应温度、催化剂等反应条件对酯化反应的影响，并对增塑剂的酸值、闪点及其他主要性能指标进行了测定，改进了酯化反应工艺条件，讨论了样品色泽、酸值及闪点的影响因素。

In this dissertation, traditional phase-transfer fluorination and solid-solid-liquid triphase-transfer esterification were studied, respectively.

本论文对传统相转移催化氟化和固一固一液三相相转移催化酯化反应进行了系统的研究。

The synthesis of a series of photo generating acid by alkylation, acyl chloriding, esterification with the available anthraquinone-2-sulfonic Na is emphasized.

本文以商业化的蒽醌-2-磺酸钠为原料，经过烷基化、酰氯化、酯化3个步骤合成了一系列释酸剂，并利用红外谱图，对每一步所得结构进行表征，对影响反应的因素进行了研究，并对释酸剂的应用结果进行了讨论。

As a kind of widely used fine chemical, glyceryl triacetate was synthesized by esterification of glycerin with acetic acid.

三乙酸甘油酯是一种用途广泛的精细化工产品。

As a kind of widely used fine chemical,glyceryl triacetate was synthesized by esterification of glycerin with acetic acid.

以乙酸、甘油为原料，通过酯化反应合成乙酸甘油酯。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。