查询词典 aldehyde acetal

Through copolymerizing AA and AN in different mole ratio, and compare the PV performance with membrane of PVA acetal membrane, we can concluded that, the separation flux of composite membrane is less than PVA acetal membrane, however, when the mole ratio of AA and AN is 1:1, the separation factor is higher than PVA acetal membrane, from the view of PSI, the composite membrane is better, thats the reason of the hydrophilic functional group and hydrophobic functional group ratio proper, it achieved good balance.

经过研究得到相对最佳的制膜条件：PVA浓度10％，甲醛浓度36％，采用加热到75℃的方法缩醛和制膜，热处理时间为15min；AA与AN的投料摩尔比为1比1左右，复合膜厚为30gm。通过渗透汽化指数的综合衡量，得到对于共聚复合膜最佳的使用温度为50℃左右。

Thus, in order to attain acetal can be used as precursor of its matrix olefine aldehyde, 2-undecental glycol acetal was synthesized, and the corresponding optimum reaction conditions as: 2-undecental 0.2mol, glycol 0.3mol, cyclohexane as solvent, catalysed by vitamin C, the optium reaction time was 6h, its reaction yield could reach over 77.25%.

为了进一步探求效果更理想的前体化合物，本文继续合成了2-十一烯醛乙二醇缩醛，通过单因素优化实验得到最佳反应条件为：环己烷作溶剂，VC作催化剂，用量0.42%，醛醇物质的量之比0.2：0.3，反应时间6h，此条件下产品收率达77.25%。

In the existing process of PVB, it has disadvantages of unsteady aldehyde groupdistribution, low content of aldehyde acetal group .

本文针对聚乙烯醇缩丁醛传统生产工艺生产的PVB存在缩醛基分布不均，缩醛度低等缺陷，系统地研究了分阶段醇解一缩合的均相工艺，二甲基亚砜的均相工艺以及极性匹配的醇法均相工艺。

In this system, the allylation was selectively toward aldehyde in the presence of ketone; the allylation squinted toward aliphatic aldehyde in the presence of aromatic aldehyde.

该方法不仅对于醛和酮具有很高的化学选择性，而且对于芳香醛和脂肪醛也有很好的选择性，当存在芳香醛时，脂肪醛优先发生烯丙基化反应。

The effects of solution\'s pH value, mol ratio between phenyl aldehyde and L-Arginine, concentrations of sodium chloride, ammonia chloride andL-Lystine, initial concentration of L-Arginine on precipitation rate of a -tolylene arginine were investigated, the results indicated that phenyl aldehyde precipitation method\'s appropriate pH value was higher than 11, suitable mol ratio between phenyl aldehyde and L-Arginine was 1.25, initial concentration of L-Arginine was must higher than 15g/L, sodium chloride had little effect on precipitation rate, on the contrary, ammonia chloride and L-Lystine had great effect on it, both of them must be eliminated; At the same time, adsorption isotherm at 25 C of L-Lystine on anion exchange resin A was measured, the result showed that the maximal equilibrium adsorbance was 30mg/g, the influences of solution\'s pH value, temperature, concentration of chloride ion on adsorption of L-Lystine by anion exchange resin A were also studied, the results indicated that appropriate operational pH value was 0.5 0.2, the effect of temperature on adsorption ratio was little, process could be operated at room temperature, the concentration of chloride ion must be eliminated.

考察了溶液pH值、苯甲醛与L-精氨酸摩尔比、氯化钠与氯化铵浓度、L-赖氨酸浓度、L-精氨酸初始浓度对苯甲醛沉淀L-精氨酸的影响，结果表明，沉淀反应的适宜pH值大于11，苯甲醛与L-精氨酸的适宜摩尔比为1.25，(来源：Aa6BC论文网www.abclunwen.com)L-精氨酸适宜的初始浓度在15g/L以上，氯化钠的存在对沉淀率基本上没有影响，而氯化铵和L-赖氨酸的存在使沉淀率下降；同时测定了25℃时阴离子交换树脂A吸附L-赖氨酸的吸附等温线，表明其最大平衡吸附量为30mg/g，考察了溶液pH值、温度、氯离子浓度对阴离子交换树脂A吸附脱除L-赖氨酸的影响，结果显示从L-精氨酸和L-赖氨酸混合液中吸附分离出L-赖氨酸的适宜pH值为10.5±0.2，温度对L-赖氨酸吸附率影响不大，吸附过程可在室温下进行，氯离子的存在使L-赖氨酸的吸附率降低。

Our company has six sets of polyketone resin production equipment, three sets of aldehyde resin production equipment and five sets of UV oligomers production equipment, with annual capacity of 2,500-ton polyketone, 1,000-ton aldehyde resin, and 4,000-ton UV oligomers, and is one of the largest manufacturers of aldehyde resin , polyketone resin and UV oligomers in Asia.

有六套聚酮树脂、三套醛树脂、五套UV光固化树脂生产装置，年产聚酮2，500吨，醛树脂1，000吨，UV光固化树脂4，000吨，是亚洲最大的醛树脂、聚酮树脂、UV光固化树脂生产企业之一。

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。

To Set up the acetal phospholipids staining method of marrow smear to define the value of acetal phospholipids staining in hemopathy diagnosis and differential diagnosis.

［目的］建立骨髓涂片的缩醛磷脂染色方法，明确缩醛磷脂染色在血液病诊断与鉴别诊断中的价值。

Reaction (1) was examined with different kinds of acetal substrate(1) and vinyl ethyl ether, and the results indicated that the 1, 1,3-triethoxy compounds could be obtained in high yields of 88 and 97% respectively when the R groups of the acetal are phenyl and anisyl, while the yields amounted only to 55-75 % for R=a...

有证据表明这种催化反应也可能是通过正碳离子中间体进行的。本反应的产物1，1，3-三乙氧基化合物经乙酸/乙酸钠溶液水解可得反式α，β-不饱和醛。水解产率：芳香族产物大于90%，脂肪族产物大于75%。

The promotion action of ionic liquid as an accelerant in synthesizing benzaldehyde ethanediol acetal and benzaldehyde propanediol acetal was studied.

摘要以离子液体为促进剂，强酸性聚苯乙烯732催化了苯甲醛与两种二元醉的缩醛反应。

You can buy sweetened beverages, if that suits you.

你若喜欢的话，可以买些含有糖精的混合饮料。

As many of you are probably aware, Nick and Vanessa were recently faced with an embarrasing sex scandal after naked pictures of the two getting jiggy with it in a hot tub surfaced the net.

正如很多你可能知道，尼克和 Vanessa 最近面临一个尴尬的绯闻事件后，赤裸裸的图片两个越来越jiggy与它在浴缸中的一个热点浮现净。