查询词典 ester value

The correlativity between nL and the chromato- graphic retain index of the ester in spirituous liquors, and the threshold value of the ketone in tea are dis- cussed.

定义一个新的拓扑指数nL，并探讨nL与食品香味物质酯、酮的色谱保留值、香气阈值之间的依存关系。

N-substituted pyrroles are synthesized by reacting acetonylacetone with carbamic ester , catalysted by p-toluenyl sulfonic acid, heated at reflux temperature for 6h, collecting evolved water, giving to 75% yields, which is 26% more than the literature value.

以对甲苯磺酸为催化剂，用甲苯作溶剂，使2，5-己二酮与氨基甲酸酯在110℃反应6h，合成了5种氮取代吡咯衍生物，其中两种未见文献报道，反应产率均达到75％以上，比文献值高出了26％。

The results of magnesium and calcium ions tolerance test indicated that the modified SPS, synthesized from the above two methods,has good chelation with magnesium and calcium ions for the crablike carboxyl and ester group and increase the reaction weight with magnesium and calcium ions for addition of hydrophilic group.Both of the two modified petroleum sulfonates could produce ultra-low interfacial tension at calcium and magnesium ions concentration lower than 600 mg/L,whereas the general petroleum sulfonates could only produce ultra-low value below 300 mg/L.

耐钙镁离子能力测试结果，以大庆炼化公司两种渣油为原料，采用上述两种合成方法制备的改性石油磺酸钠，由于产物中引入蟹爪状羧酯基，对钙镁离子有较强的螯合作用，同时增加了亲水基，增大了表面活性剂分子与钙镁离子的反应量，因而在600mg/L的钙镁离子溶液中获得10-3级的超低界面张力；而普通石油磺酸钠仅能在300mg/L的钙镁离子溶液中获得超低界面张力。

Stability of electrodeposition liquid, the physical and chemical resistance properties of the film depend on amine value, kinds of glycidic ester used, GA content and the amount of blocked polyisocyanate used.

结果表明，环氧基在固化过程中会参与交联反应，电泳液的稳定性、涂膜的物理性能和耐化学品性能由胺值、缩水甘油酯单体种类、丙烯酸缩水甘油酯含量和封闭型多异氰酸酯用量等因素决定。

The results show that the optimal parameters of esterification are as follows: 4% of SO42-/ZrO2, molar ratio of methanol to litsea cubeba kernel oil 101, 68 ℃ of reaction temperature and 4 h of reaction time, the acid value decreases to 2.52 mg/g. Compared with the traditional acidic-catalyzed method, this method has the advantages of no acid proof equipment, easy to recycle catalyst and no acidic waste water emission. The optimal parameters of transesterification are as follows: 25 ℃ of reaction temperature, 0.5% of hexadecyl-trimethyl-ammonium bromide, 1% of NaOH, molar ratio of methanol to the oil 61 and 15 min of reaction time. The ester exchanging rate is 97.6%. This method adopts phase transfer catalyst and produces industry prospect, which has many advantages such as energy-saving and time-saving under room temperature.

研究结果表明，固体酸SO42-/ZrO2催化酯化反应的最佳条件为：油重4%的SO42-/ZrO2，醇油摩尔比为101，温度为68 ℃，反应时间为4 h，原油酸值降到2.52 mg/g；该法相对浓硫酸催化酯化法具有不需耐酸设备、催化剂易回收、无废水排放等优点；相转移催化酯交换反应的最佳条件为：温度为 25 ℃，0.5%的十六烷基三甲基溴化铵，油重1%的NaOH，醇油摩尔比为61，反应15 min，原油酯交换率达到97.6%；采用相转移催化技术，反应在常温下进行，大大减少了能耗，缩短了反应时间，具有的产业化前景。

The method is characterized in that:(1) the reflux of the 2-[N, N- 2amino]-3-cyano-group-4-thiopheneacetic-5-carboxylic acid tetra ester is carried out in the proper sodium hydroxide aqueous solution of alcohol for 5h to 6h and the pH value is kept over 10 during hydrolysis;(2) the ethanol of 20 per cent to 60 per cent is added and then the strontium chloride aqueous solution with 2times to 2.5times molal weight is directly added, precipitates the crystal, is filtered and dried;(3) water is added to carry out the reflux and the little salt packed in the crude product is removed, and the product is collected through heat filtration.

其特征在于：①将2--3-氰基-4-羧甲基噻吩-5-羧酸四酯在适量氢氧化钠水醇溶液中回流5～6小时，水解过程保持pH值10以上；②然后再加入20-60％乙醇，随后直接加入2-2.5倍摩尔量氯化锶水溶液，析出结晶，过滤，晾干；③加水回流，除去粗品中包裹少量盐，热过滤，收集产品。

The quality indexes of rosin pentaerythritol ester were color 125, acid value 19.7mg/g, and softening point 103.5℃.

所得到产品的质量指标为：颜色为哈森色125号，酸价19.7mg／g，软化点103.5℃。

The company mainly produces cinnamaldehyde, cinnamic acid, cinnamic alcohol, cinnamic nitriles,-bromo-cinnamic aldehyde, amyl cinnamic aldehyde, acetic acid Gui ester, cinnamic acid acetate, L-carnitine, coumarin , vitamin B1 and so on, one of cinnamon products only amounted to more than 100 kinds of quality and technical content are up to domestic advanced level, is expected to reach an annual output value of 10 billion yuan.

公司主要生产肉桂醛、肉桂酸、肉桂醇、肉桂腈、α-溴代肉桂醛、戊基肉桂醛、乙酸桂酯、肉桂酸乙脂、左旋肉碱、香豆素、维生素B1等，其中仅肉桂系列产品就达100多种，其质量及技术含量均达到国内先进水平，预计年产值可达10亿元人民币。

The company mainly produces benzaldehyde, cinnamic aldehyde, cinnamic acid, cinnamic alcohol, cinnamic nitriles,-bromo-cinnamic aldehyde, amyl cinnamic aldehyde, acetic acid Gui ester, cinnamic acid acetate, L-carnitine, coumarin, vitamin B1, etc., of which only cinnamon series reached more than 100 kinds of products, its quality and technical content are up to domestic advanced level, is expected to reach an annual output value of 10 billion yuan.

公司主要生产苯甲醛、肉桂醛、肉桂酸、肉桂醇、肉桂腈、α-溴代肉桂醛、戊基肉桂醛、乙酸桂酯、肉桂酸乙脂、左旋肉碱、香豆素、维生素B1等，其中仅肉桂系列产品就达100多种，其质量及技术含量均达到国内先进水平，预计年产值可达10亿元人民币。

The advantages of catalytic synthesis of oxalate ester in gaseous phase by carbon monoxide are summarized. The five important characterization of our patent technology invented for the use of industrial raw material and the potential good economic value of the process are presented. It indicates that study and development of catalytic synthesis of oxalate ester .oxalic acid as well as glycols by natural gas in gaseous phase have a great advantage for full utilization of natural gas....

概述了&CO气相催化合成草酸酯&技术的先进性，介绍用工业性原料为主要内容的专利技术：&气相催化合成草酸酯连续工艺&的五个主要特点及其潜在的经济效益，并指出，用天然气经合成气进行气相催化合成草酸酯和草酸、乙二醇的研究与开发，可使天然气得到充分的利用，具有很好的经济效益，是天然气化工综合利用的一条有效途经，也是当代C1化学的重要发展方向。

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。