查询词典 esterification

Meanwhile, molecular weight of pectin was related to its physicochemical properties. The larger the molecular weight of pectin was, the more its galacturonic acid content and degree of esterification and gelatination were.

相对分子质量与其理化性质有着对应的关系，果胶半乳糖醛酸含量、酯化度和胶凝度随相对分子质量增大而增大，单糖组分也随相对分子质量增大而增多。

The reaction of 4-bromaophenol and geranic acid in the presecnce of p-TsOH afforded 4-bromophenolα-cyclogeranoate in which cyclization of geranic acid toα-cyclogeranic acid was followed by esterification ofα-cyclogeranic acid with p-bromophenol.

对溴苯酚与香叶酸在p-TsOH催化作用下发生了香叶酸向α-环香叶酸环化、α-环香叶酸环与对溴苯酚的酯化，得到了唯一产物α-环香叶酸对溴苯酯，产率68%。

The diisoamyl glutarate in catalysis of silicotungsticacid was preparated by esterification of isoamyl alcohol and glutaric anhydride seperated from dicarboxylic acid.

用硅钨杂多酸为催化剂，以从二羧酸中分离出的戊二酸酐和异戊醇为原料合成了戊二酸二异戊酯。

The asymmetric esterification of glycidol catalyzed by lipase was carried out in a nonaqueous medium. The effect of the replacement of water necessary for the function of lipase with water-mimicking solvent on the resolution was investigated.

利用脂肪酶在非水介质中对外消旋环氧丙醇进行不对称酯合成反应，重点研究了强极性有机溶剂作为仿水溶剂完全替代反应体系中的微量&必须&水对酶促拆分反应的影响。

In order to disscuss the compositiopn and contents of the fatty acid in peony and chinese peony flower; as well as its utilization, the methods of esterification was used to get the oil sample and composition of fatty acid were tested by gas chromato graphy.

采用脂肪酸甲酯化的方法获得油样，用气相色谱法对牡丹和芍药花瓣中的脂肪酸组成进行定性和定量测定，并分析了牡丹和芍药不同时期花瓣中脂肪酸组分和含量的变化。

In this paper,the strong acid cation exchange resin has been studied as the catalyst for the esterification of gulonic acid .

选用强酸性阳离子交换树脂代替浓硫酸催化剂，对古龙酸的甲酯化反应进行了探索性研究。

The technological conditions with methylacrylic acid and hexadecanol as raw-material and the synthesis of hexadecyl methylacrylate by direct-esterification are studied.

研究了以α-甲基丙烯酸和十六醇为原料采用直接酯化法合成α-甲基丙烯酸十六酯的工艺条件。

The esterification reactions between organic acids and the hydroxy groups of alumina powder surfaces change the polar hydroxylic surface structure that causes agglomeration of powders into an organic layer surface structure with a modified monomoleculer layer of aliphatic chains.

压制成型以其工艺简单、效率高、成本低、自动化程度高等优点而在传统陶瓷和高性能陶瓷制造中始终占有重要地位。影响坯体均匀性和致密度的因素很多，如粉体的粒度、形状、表面状态，粉体间的相互作用和流动性，成型加压制度等[1] 。

The effects of catalyst synthesis and esterification reaction conditions on the yield of the isoamyl acetate were investigated.

将该催化剂用于醇酸反应制备乙酸异戊酯，考察了反应条件对酯化率的影响。

The catalyst had high activity and high selectivity in esterification of phthalic anhydride with isoamyl alcohol.

该催化剂对邻苯二甲酸酐和异戊醇的酯化活性高，无副反应。

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。