乙醛

Glyoxylic acid and oxazolidine with carboxyl groups were applied for modification of collagen.

分别应用含羧基的噁唑烷和乙醛酸对皮粉进行化学改性，提高对铬鞣剂的吸收率以达到减少铬鞣污染的目的。

D, L-p-HPH was produced by employing amidoalkylation reaction of phenol with glyoxylic acid and urea under acidic conditions.

用尿素、乙醛酸和苯酚合成底物D，L-对羟基苯海因，收率为62％，与文献报道相近。

Ethoxy-4-hydroxy mandelic acid was synthesized from glyoxylic acid and o-ethoxyphenol in alkaline solution.

在碱性条件下由乙醛酸和邻乙氧基苯酚合成了3-乙氧基-4-羟基苯乙醇酸。

As an intermediate for preparing vanillin derived from glyoxylic acid, 3, 4-dihydroxymandelic acid is synthesized based on condensation of catechol and glyoxylic acid in alkaline aqueous solution.

以邻苯二酚和乙醛酸为原料，在碱性条件下发生缩合反应，合成了3， 4-二羟基扁桃酸，此物质是多种香料和药物合成的重要中间体。

The diluent solution of glyoxylic acid and oxalic acid was used as the separation object.TOA (in n-octanol) was used as the solvent. The extraction characteristics of single acid and two-acid solution were studied,and the influence of pH and the concentration of complexing agent on the distribution coefficients were measured. The suitable mathematic models were proposed to describe the relationship between TOA and carboxylic acid based on assumed extraction reaction in organic phase.

摘 要：以草酸和乙醛酸的稀溶液为分离对象，采用三辛胺为萃取反应剂、正辛醇为稀释剂，研究了单溶质、双溶质有机酸的萃取分离特性，测定了溶液pH值、萃取反应剂的浓度等因素对双溶质有机酸萃取的影响，提出了萃取的化学反应发生在有机相中的假定，建立了TOA萃取草酸的数学模型。

A proper composition of the plating solution was obtained as follows: copper sulfate 16 g／L,EDTA·2Na 30 g／L,glyoxylic acid 13 g／L,2,2'- bipyridine 10 mg／L.

优化工艺条件：硫酸铜16 g／L，乙二胺四乙酸二钠30 g／L，乙醛酸13 g／L，2，2′-联吡啶10 mg／L，pH 12.5，温度 40℃。

Is located in Yellow River Delta, located in West Liuqiao Guangrao County Economic Development Zone, the brink of East Green high-speed, convenient transportation and strategic location, covers an area of 350,000 square meters, is a professional Companies are now built with an annual output of 3,000 tons glyoxylic acid, Allantoin 300 tons, 5,000 tons of sodium methanol, ethanol production of 5,000 tons of sodium scale.

广饶县弘达精细化工有限责任公司座落于黄河三角洲，位于广饶县西刘桥经济开发区，濒临东青高速，交通便利，地理位置优越，占地面积达350000平方米，是一家专业化公司，现已建成年产乙醛酸3000吨、尿囊素300吨、甲醇钠5000吨、乙醇钠5000吨的生产规模。

The diluent solution of glyoxylic acid and oxalic acid was used as the separation object. TOA (in n-octanol) was used as the solvent. The extraction characteristics of single acid and two-acid solution were studied, and the influence of pH arid the concentration of complexing agent on the distribution coefficients were measured. The suitable mathematic models were proposed to describe the relationship between TOA and carboxylic acid based on assumed extraction reaction in organic phase.

以草酸和乙醛酸的稀溶液为分离对象，采用三辛胺为萃取反应剂、正辛醇为稀释剂，研究了单溶质、双溶质有机酸的萃取分离特性，测定了溶液pH值、萃取反应剂的浓度等因素对双溶质有机酸萃取的影响，提出了萃取的化学反应发生在有机相中的假定，建立了TOA萃取草酸的数学模型。

Using glyoxylic acid to replace the harmful chemical substance formaldehyde as a reducing agent, an copper layer was deposited on rosin substrate by this electroless copper plating technology.

用乙醛酸代替有害的化学药品甲醛作为还原剂，在树脂基材上进行化学镀铜。

At present,ethylvanillin has mostly been prepared in the world by pyrochemical oxidation of condensation compound of o-ethoxyphenol and glyoxylic acid,which is of the problem that the catalysts such as cupric oxide were removed difficultly in the end.

乙基愈创木酚-乙醛酸高温化学氧化法是目前国际上制备乙基香兰素的主要方法，但该法存在反应终了时铜盐或氧化铜等催化剂除去困难的问题。

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。