乙醛

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。

The results showed that V_2O_5/C catalyst exhibited obvious activity for glyoxal oxidation and high selectivity of glyoxylic acid.

在确定了催化体系中氧化产物的基础上，建立了比值导数波谱法同时分析乙二醛和乙醛酸，该法为乙二醛催化氧化过程的实时、快速分析提供了新的手段。

The glyoxalic acid is a kind of important industrial chemical, it has ten different production methods.

乙醛酸是一种重要的化工原料，有十余种不同的生产方法，简单介绍了其目前的主要生产工艺和技术进展情况。

Keywords Glyoxalic acid;Production technology;Technical progress

乙醛酸：生产工艺：技术进展

Average current efficiency is 85.06%, chemical yield is 94.01%, average bath voltage is≤4.5V, the concentration of glyoxalic acid is ≥40%, the concentration of oxalic acid is ≤2.5%, and no oxalic aldehyde in the product is present.

本论文通过优化工艺控制，确定了最佳工艺条件，使平均电流效率达85.06%，化学收率达94.01%，平均槽电压≤4.5V，产品中乙醛酸浓度≥40%，草酸≤2.5%，产品中无乙二醛，可以满足下游产品的质量要求。

The nanocrystalline film was composed of a three-diminsional network of interconnected particles.Reodx behavior and electrocatalytic activities of the Ti/nano-TiO2 electrode were investigated by cyclic voltammetry from oxalic acid and nitrobenzene to glyoxalic acid and p-aminionphenol. The Ti/Ti redox system,as a medium,shows highly electrocatalytic activities and stable characteristic to indirect electroreduction of organic compounds(e.g.:oxalic acid and nitrobenzene).

循环伏安法研究了纳米TiO2膜电极对草酸还原为乙醛酸、硝基苯还原为对氨基苯酚反应的电催化活性，结果发现纳米膜中的Ti/Ti氧化还原电对起一种中介作用，可使有机物如草酸和硝基苯间接电还原，且电极催化活性高，性能稳定。

When 2.0 g/L of malate was added to the fermentation medium, the metabolic flux of byproducts L-Ala and lactic acid decreased by 22.1% and 16.5%. At the same time, the metabolic channeled to EMP and glyoxyl circle decreased by 2.26% and 9.09%. However, the metabolic flux channeled to HMP increased by 2.26%.The metabolic flux channeled to the L-glutamic acid synthesis pathway increased from 73.59% to 79.92%.

在L-谷氨酸发酵中、后期添加2.0 g/L苹果酸后，合成副产物L-丙氨酸和乳酸的代谢流量明显减少，分别降低了22.1%和16.5%，EMP途径和乙醛酸循环的代谢流分别减少了2.26%和9.09%，HMP途径的代谢流增加了2.26%，而L-谷氨酸生物合成的代谢流从73.59%增长至79.92%，较未添加前提高了6.33%。

Glyoxylic acid can be obtained without pH regulation during the reaction, and glyoxylic acid can not be oxidize...

研究结果表明，乙二醛的催化氧化副产物甲酸对乙二醛和乙醛酸的分析没有干扰。

Glyoxylic acid is an important basic material or organic intermediate, widely used in the fields of perfume, medicine and pesticide, etc.

乙醛酸是一种重要的基本原料或有机中间体，广泛应用于香料、医药、农药等领域。

Factors affecting on plating rate and solution stability were studied for glyoxylic acid reduced electroless copper plating system.

摘 要：研究了乙醛酸化学镀铜体系中各因素对镀速和溶液稳定性的影响，根据实验确定了适宜的化学镀铜液的配方及工艺规范。

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。