乙醛

In four flavor models, isoamyl alcohol model and ethyl acetate model have good capacity for simulation and prediction, whereas acetaldehyde model and diacetyl model do not.

在建立的4个风味物质模型中，异戊醇和乙酸乙酯模型的仿真能力和预测能力都比较强，双乙酰和乙醛模型的仿真能力和预测能力都比较差，需要进一步研究。

Production technology of synthesis of allantoin are reviewed, including glyoxal oxidation, electrochemical synthesis, calcium glyoxylate synthesis, dichloroacetic acid synthesis, ace-tochloral method, and oxidative decarboxylation.

评述了乙二醛氧化法、化学法、醛酸钙法、素三氯乙醛合成法、酸二氯乙酸法和尿酸氧化脱羧法等合成尿囊素的各种工艺。

The electroless copper plating was studied in a bath consisting of glyoxylic acid as reducing agent,Na2EDTA as complexing agent,both 2,2′-dipyridyl and K4Fe6 as additives,focused on the influence of the additives on the deposition rate,as well as on the composition,structures and surface morphology of the deposits.

以乙醛酸作还原剂、Na2EDTA为络合剂、2，2′-联吡啶和亚铁氰化钾作为添加剂组成化学镀铜体系，研究了两种添加剂对化学镀铜速率、镀层表面形貌、组成和结构的影响。

The main volatile chemical components were n-hexadecanoic acid (24.03%), dodecanoic acid (6.20%) tetradecanoic acid (6.44%), 6, 10, 14-trimethyl-2-pentadecanone (4.03%), nonanal (4.54%), anthracene (4.26%), benzeneacetaldehyde (4.25%).

主要成分有：正十六酸(24.03)%、十四酸(6.44%)、6，10，14-三甲基－2-十五烷酮(4.30%)、壬醛(4.54%)、蒽(4.26%)、苯乙醛(4.25%)。

It is reported that the electrolytic process of oxalic to glyoxalic acid by electroreduction on titanium cathode in this paper.

本文报道在钛阴极上草酸还原制乙醛酸的电解工艺。

Glyoxal is prepared with waste liquid propellant HNO3-27S and ethanal .

利用报废的液体推进剂硝酸-27S和乙醛制备乙二醛。

The headspace gas chromatography was used to determin the ethanal content in the production process of bottle grade PET chip.

论述了瓶级聚酯切片生产过程中，采用顶空气相色谱法测试切片中乙醛含量的称样量、样品处理、颗粒度、顶空热平衡时间、热平衡温度、标定及其他顶空测量参数的优化。

The methods to reduce the ethanal content in chips were expounded, such as reducing the reaction temperature, decreasing the final poly-condensation liquid level properly, stopping using the recovery EG and adding stabilizer.

介绍了低醛超有光聚酯切片的开发，阐述了降低切片中乙醛的质量分数的方法，即：降低反应温度，适当减少终缩聚反应的液位、停用回收EG、加稳定剂等。

3A biomimetic catalytic system M_n/CH_3CHO has been used in the selective oxidation of p-chlorotoluene.The effects of the center metal ions,the amount of catalyst and ethanal,the oxygen pressure,the reaction time,and the reaction solvents on the selective oxidation were investigated.

3将M_n/CH_3CHO仿生催化体系用于对氯甲苯的选择性氧化，研究了不同中心金属离子、催化剂用量、乙醛用量、氧气压力、反应时间及反应介质对反应的影响。

The results show that among the acetoacetonate complexes,Co_3 has the best catalytic activity.The optimum reaction conditions were as follows:0.764 mmol of Co_3,mole fraction of ethanal 10%based on the substrate,room temperature,oxygen pressure 2 MPa,reaction time 11h and solvent acetonitrile.Under these conditions,13.3%p-chlorobenzaldehyde was obtained with 15.3%conversion and 87.2%selectivity.The oxidation can also be carried out without solvent with 8.1%conversion,89.1%selectivity and 7.2%yield respectively.

在金属配合物中Co_3的催化性能最好，在其用量为0.764 mmol、乙醛用量为反应物物质的量的10%、氧气压力为2MPa时，以乙腈为反应介质，室温下反应11h，反应的转化率和选择性可达15.3%，87.2%，对氯苯甲醛收率可达13.3%；反应也可在无溶剂时进行，此时反应的转化率、选择性及醛的收率分别为：8.1%，89.1%，7.2%。

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。