查询词典 acid ratio

It showed that the ammonium ferric sulfate dodecahydrate was an excellent catalyst,the yield of the n-butyl lactate could reach over 95.0% under molar ratio of n-butyl alcohol and lactic acid 2.25∶1,the reaction temperature of 110～125℃,reaction time of 1.5 h and amount of the ammonium ferric sulfate dodecahydrate catalyst of 2.5%.

实验表明：NH4Fe(SO4)212H2O是合成乳酸正丁酯的良好催化剂。最佳反应条件为：醇酸物质的量比2.25∶1，催化剂的用量为反应物料总量的2.5％，酯化反应时间为1.5 h，反应温度110～125℃，酯化率可达95.0％。

The influences of the concentration and generation of polyamidoamine dendrimer, the ratio of dodecanoic acid to toluene, and pH in the water phase on the extraction yield of helianthine were systematically studied by selecting helianthine as the guest molecule and electrostatic self-assembled PAMAM as the host.

本文采用低支化树枝状大分子聚酰胺胺与月桂酸进行分子自组装得到了一系列具有稠密的疏水性外围和亲水性内核的自组装大分子，再以自组装大分子为宿主，系统地研究了树枝状大分子聚酰胺胺的浓度、支化代、月桂酸与甲苯的质量比及水相pH值对客体分子甲基橙相转移行为的影响规律。

Polymerization was carried out between dimethyl adipate and triamine with the same mole ratio in the reactor. Acid dyeable additive can be obtained under the conditions of transesterification temperature 180~220℃, polycondensation temperature 240~270℃,pressure40~50Pa, The infrared analysis results showed that at the position of 1639cm^(-1), there was an obvious characterisitc peak of amide bond.

己二酸二甲酯与三胺按等量比在反应釜中进行聚合，在酯交换温度180~220℃，缩聚温度240~270℃，压力40~50Pa条件下即可获得酸性染料可染添加剂。

The influences of mole ratio of ethanediol and naphthenic acid,a mount of catalyst,reation time,reation temperature etc.on est erification were discussed and the suitable processing conditions were found.

介绍了用氧化亚锡非酸性催化剂催化合成环烷酸季戊四醇脂的方法，通过讨论醇酸摩尔比、催化剂用量、反应时间、反应温度等因素对该脂化反应的影响，从而确定了适宜的工艺条件。

The influences of mole ratio of ethanediol and naphthenic acid,a mount of catalyst,reation time,reation temperature etc.on est erification were discussed and the suitable processing conditions were found.

文摘：介绍了用氧化亚锡非酸性催化剂催化合成环烷酸季戊四醇脂的方法，通过讨论醇酸摩尔比、催化剂用量、反应时间、反应温度等因素对该脂化反应的影响，从而确定了适宜的工艺条件。

In this paper, the electroplating of bright Zn-Ni alloy process was studied, the effect of (1-hydroxy ethylidene diphosphonate acid coordinating agent, chloride content, [Zn2+]/[Ni2+] mole ratio, cathode current density, temperature, a class of aldehyde compound (abbreviated as ZNP additive agent) and supplementary coordinating agent on Ni content, and brightness of plating layer was discussed, the physical phase of alloy plating layer and stability of plating solution were determined.

研究了用有机多膦酸盐作络合剂，ZNP作添加剂电镀光亮锌镍合金，探讨了络合剂、氯化物含量、[Zn2+]/[Ni2+]比、阳极电流密度、温度、辅助络合剂对合金中镍含量的影响，测定了合金镀层中物相组成及镀液稳定性，通过筛选得出最佳最镀光亮锌镍合金的镀液组成及工艺条件，并讨论了锌镍合金的异常共沉积机理。

The derivative ratio of UV spectrum is used to analyze a mixture of glyoxal and glyoxalic acid.

用紫外光谱的比值导数法对乙二醛与乙醛酸的二元混合物进行分析，该方法能将乙二醛和乙醛酸重叠光谱分开并消除互相干扰，从而方便的完成两组分混合体系中各组分的测定。

Absorbance ratio derivative method was developed for the simultaneous determination of glyoxal and glyoxylic acid.

利用比值导数波谱法同时检测乙二醛和乙醛酸，为GLY催化氧化过程的实时、快速分析提供了新的手段。

Moreover, the crossed experiment has been performed to determine the optimum condition: the molar ratio of glyoxylic acid to o-ethoxyphenol to sodium hydroxide 1.0:1.2:2.5, sodium hydroxide concentration 2mol/L, temperature 50℃, time 5h.

通过正交实验确定了合成的最佳条件：n：n：n=1.0：1.2：2.5，氢氧化钠浓度2mol/L，温度50℃，时间5h。

After the above agent all the hypothesis of the optimization assembly, versus dynamic variance that different the growing period air ratio was studied, the air proportion affecting organisms used in two-step fermentation process and decide the air proportion for different cultivating period and investigate to what extent air may affect the organisms used in two-step fermentation process so that the fair term was created for 2- keto -L- gulonic acid of the accumulation.

在以上因素都优化组合的前提下，对不同生长期空气比的动态变化研究，确定了混合菌培养过程中，根据实际单罐批的生长情况，优化控制空气比可以协调巨大芽孢杆菌﹑氧化葡萄糖酸杆菌之间关系，为2-酮基-L-古龙酸的积累创造良好的条件。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。