查询词典 esterification

Pre-esterification of China wood oil catalyzed by solid acid in fixed bed reactor was researched.

利用固定床反应器，以固体酸为催化剂催化桐油预酯化反应。

Therefore esterification crosslinked reactionbetween polyearboxylic acid and wood can be quantitatively determined.According toexperiment results of stereoscopic configuration choices by crosslinking agents,crosslinkingreaction between model of reaction intermediate and wood,and the intermediate characteristic incrosslinking reaction,crosslinking reaction intermediate was proofed.We can infercrosslinking reactions between polycarboxylicacid and wood want through a mechanism of twosteps reaction process,the first cyclic anhydrides were formed as intermediates by dehydratingbetween hydroxyls in polycarboxylic acids,second esters were occurred by substitution reactionbetween wood hydroxyls and cyclic anhydrides.

从而可全面定量表征木材与多元羧酸类化合物的酯化交联反应；依据交联剂立体构型选择性、反应中间体模型物与木材的交联反应和交联反应中间体的波谱特征实验结果，证实了交联反应中间体，因此可以推测：多元羧酸类化合物与木材化学组分的交联反应是经历两步反应的机理，首先多元羧酸中相邻羧基的羟基之间脱水形成五元环酸酐中间体，然后木材的羟基与酸酐发生亲核取代反应形成酯。

XPS and FTIR spectroscopy analysis indicated that chemical bonds were formed between maleic rosin and wood flour through the esterification reaction of anhydride groups and hydroxyl groups on wood surface.

FTIR与XPS分析表明，马来松香分子中的酸酐基团与木粉表面的羟基发生了酯化反应，并且马来松香是以单酯的形式接枝到木粉表面，同时产生－游离羧基。

Several high-temperature monascus strains screened from high-temperature Daqu (used for Maotai-flavor liquor production in Langjiu Group were used to study the esterification conditions of their raw zymin.

以从郎酒厂酱酒生产用高温大曲中分离筛选出几株产酯能力相对较强的高温型红曲霉为菌种，对其粗酶制剂酯化条件进行初步研究。

It was found that ARA was composed of esterification products of (2-HEA)-ester with pimaric acid, dehydroabietic acid, abietic acid and two isomers of acrylpimaric acid. ARA is a good crosslinking agent which can copolymerize with most vinyl monomers. The properties of solvent-resistance and heat resistance of the copolymer were improved considerably by the use of ARA.

实验结果表明：ARA主要由海松酸、脱氢枞酸、枞酸和丙烯海松酸的二种异构体的丙烯酸－2-羟基乙基酯的酯化产物组成，ARA是一种良好的交联剂，可与大多数乙烯基单体共聚合，其与MMA的共聚物的耐溶剂性和耐热性均得到了较大幅度的提高。

Studies on Acetalization of Litsea Cubeba Oil with Glycol Catalyzed by Dealuminated USY;3. on the esterification and acetalization reactions was discussed.

通过酯化反应和缩醛化反应，考察了含硅二烃基锡二芳香羧酸酯在有机反应中的催化活性，讨论了催化剂用量、反应时间和溶剂等因素对催化反应的影响。

A series of p-toluene sulfonylamido acetacylhydrazone derivatives were synthesized from p-toluenesulfonyl chloride which reacted with glycine to get the intermediate p-toluene sulfonylamido glycine, then through the esterification, hydrazinolysis to afford another intermediate p-toluene sulfonylamido acethydrazide, which condensed with different aldehydes to obtain the target compounds that were characterized by IR, 1H NMR, 13C NMR spectra and elemental analysis.

魏太保 ；冷艳丽；王永成；张建辉；张有明*摘要：以对甲苯磺酰氯为原料，通过与氨基乙酸反应得到中间体对甲苯磺酰氨基乙酸，再经酯化、肼解得到对甲苯磺酰氨基乙酰肼，然后与相应的醛缩合得一系列对甲苯磺酰胺基乙酰腙类化合物。其结构经元素分析， IR， 1H NMR和13C NMR确证。

The chemical method include treating with sulfuric acid,saponification,acylation, esterification, etc.

化学方法包括酸洗法、皂化法、酰化法和酯化法等。

The results also showed that IR,13C NMR and GC MS were effective methods for tracking the course of acylation and esterification reaction.

实验结果还显示IR，13C NMR和GC-MS联用分析技术可有效地对反应过程进行跟踪。

Then, D-prolinamide was synthesized by amino protection, esterification, amidation and deprotection.

进一步应用手性源技术，经氨基保护、酯化、氨化和脱保护等步骤，不对称合成目标化合物。

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。