查询词典 esterification

The effects of activation temperature and activation time for the catalyst and the esterification conditions on the yield of isoamyl isovalerate were investigated.

用纳米级HZSM-5分子筛作催化剂合成了异戊酸异戊酯，考察了催化剂的活化温度和活化时间以及酯化反应条件对酯收率的影响。

The difference of esterification yield of borneol ester and isoborneol ester was analyzed.

对正、异冰片酯化反应的差异进行了分析。

The synthesis of eight compounds ( borneol ester and isoborneol ester) and other esters catalyzed by nanometer solid superacids were also researched. In addition, we still analyzed the distinction of esterification yield of borneol ester and isoborneol ester. The particle size, surface area, changes of profile and acidity of nanometer solid superacids were mensurated and analyzed by TEM, BET, XRD, IR and acid indicator.

对纳米固体超强酸催化合成系列正、异冰片酯及其它酯的反应作了一定的研究，论文分析了正、异冰片酯化反应的差异，并用TEM、BET、XRD、IR及酸标指示剂等方法和手段对纳米固体超强酸的粒度、比表而积、形貌变化及其酸性大小进行了分析和测定，通过IR、~1H NMR、~？

The catalytic activity was affected by prepared condition through esterification reaction of acetic acid and isobutyl alcohol.

通过沉淀-浸渍法制备一系列S2O82-/ZrO2-SiO2固体超强酸催化剂，用乙酸和异丁醇的酯化反应研究了制备条件对催化剂活性的影响。

D limonene was distributed among the culture flasks (200 mg/L). The flasks were incubated at 28oC on a rotary shaker (r/min=120) for 5 days. On completion, the culture broth were successively extracted with EtOAc. The extract was quantitatively measured by gas chromatography mass spectrometry analysis, The results showed that biocatalytic reactions were comprised of oxidation, including hydroxylation and ketonization which occurred at different positions of the D limonene, as well as hydrogenation, hydrolyzation, esterification and cyclic cleavage. These bacteria strains possess the distinctive biocatalytic capacities towards the D limonene. A series of terpenoids, including sesqui , di and tri terpernoids were also observed,which was accounted for D limonene had influence on the metabolites of marine bacteria.

以2216E为培养基，添加200mg/L的柠檬烯，在28℃，以120 r/min摇瓶培养5 d，用乙酸乙酯提取培养液，经GC MS分析其转化产物，结果显示，这些细菌能在柠檬烯的不同位置进行羟基化、羰基化等，并伴随有还原、水解、酯化、开环等反应，但转化能力和转化程度不同；在产物中，还检测到系列结构不同的其它萜类：包括倍半萜、二萜以及三萜等，这些萜类化合物的产生跟柠檬烯的加入有关，说明柠檬烯能影响细菌代谢产物的产生。

Taking refined konjak powder as raw material, taking the mixture of NaH2PO4 and Na2HPO4 as phosphate esterification reagent, the konjac glucomannan phosphate ester was prepared under the dry condition, and the optimal process of konjac glucomannan phosphate ester was optimized by orthogonal test method.

方法］以细化的魔芋粉为原料，以NaH2PO4和Na2HPO4混合物为磷酸酯化试剂，在干法条件下，制备魔芋葡甘聚糖磷酸酯，并采用正交试验法优化魔芋葡甘聚糖磷酸酯最佳工艺。

Based on the concepts of fragrance chemistry, under the guidance of molecules structure and odour relationships, we synthesized a list of potential odorants 46a-s, 47a-b, 48a-d and 49a-e by esterification, lactonization and reduction of the Ireland-Claisen rearranged products. Some of them were evaluated.

四、基于合成香料化学目前发展的现状，以香料的分子结构对香气影响的一些规律为指导，对所获得的部分Ireland-Claisen重排产物羧酸进行结构修饰，合成了系列潜香分子46a-s，47a-b，48a-d及49a-e，并进行了评香。

Such structural complexity is further enhanced by O-acetylation, esterification, lactonization, as well as other forms of substitutions, reflecting significance of carbohydrates in cell recognition.

细胞表面上糖缀合物的糖链经常以多/寡聚体形式存在，并且结构复杂，常常大量表达唾液酸、糖醛酸、硫酸化糖基等酸性糖，并发生O-乙酰化、酯化和内酯化等修饰。

D-isoascorbyl laurate was synthesized by esterification from lauric acid and by transesterification from methyl laurate, respectively.

在浓H2SO4既作为反应介质又作为催化剂的体系中，分别用直接酯化法和酯交换法合成异V月桂酸酯。

The optimal conditions were as follows: molar ratio of lauric acid to phytosterols 1.4:1, reaction temperature 120℃, SDS 1.5% and reaction time 4 hours. Under this condition, the yield of esterification reached 87.9%. After three steps of purification the content of phytosterol ester is about 93.1%. The product was determined as phytosterol laurate with FT-IR.

在酸醇摩尔比1.4：1，反应温度120℃，SDS用量1.5%反应时间4h的最优条件下植物甾醇酯化率可达到87.9%；反应所得的植物甾醇酯粗产品经3步提纯后纯度可达93.1%；对提纯过的产品进行红外光谱分析确定反应产物为植物甾醇酯。

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。