丁缩醛

The experimental results showed that SO_4 2-/TiO_2-MoO_3 was an excellent catalyst for synthesizing isobutyraldehyde glycol acetal .

研究了以固体超强酸SO42-/TiO2-MoO3为催化剂，异丁醛和乙二醇为原料，合成异丁醛乙二醇缩醛的反应条件。

Using self-made H3PW6Mo6O40 as catalyst,butyraldehyde glycol acetal was prepared by butyraldehyde and glycol.

用自制的磷钨钼杂多酸作催化剂，以丁醛和乙二醇反应合成了丁醛乙二醇缩醛。

Butyraldehyde glycol acetal was synthesized from butyraldehyde and glycol by using iodine as catalyst.

以单质碘为催化剂，通过丁醛和乙二醇反应合成了丁醛乙二醇缩醛。

Using butyraldehyde and 1,2-propanediol as raw materials, H3PW6Mo6O 40 /TiO2 as catalyst, butyraldehyde 1,2-propanediol acetal is synthesized.

以二氧化钛负载磷钨钼杂多酸为催化剂，通过丁醛和1，2-丙二醇反应合成了丁醛1，2-丙二醇缩醛。

Secondly,a mixture of acetone and methyl formate was added into the methanol solution of sodium methoxide to prepare sodium formyl acetone by Claisen reaction.

以金属钠为原料，甲醇为溶剂，先制成甲醇钠的饱和甲醇溶液，再滴加丙酮和甲酸甲酯进行Claisen酯缩合制得丁酮烯醇钠，最后在强酸作用下与甲醇进行缩醛化反应合成了4，4-二甲氧基-2-丁酮，过程总收率达到73.1%，纯度98.7%。

Jiangmen City, Czech Run Chemical Trading Co., Ltd. operating chemical raw materials, mainly toluene, xylene, a rough, crude dimethyl, mixed aromatics, mesitylene, crude Sanjia, mixed dimethoxy, methylal, n-butyl, B ester, n-butyl alcohol, isobutyl alcohol, vinyl acetate, styrene, butyl ether, cyclohexanone, 6 #, 120 #, 200 #, titanium dioxide, phthalic anhydride, DOP, isopropanol for Main Product, Quality Assurance , the price advantage of abundant supply.

江门市捷润化工贸易有限公司经营化工原料，主要为甲苯、二甲苯、粗甲、粗二甲、混合芳烃、三甲苯、粗三甲、混二甲、甲缩醛、正丁酯、乙酯、正丁醇、异丁醇、醋酸乙烯、苯乙烯、丁醚、环己酮、6#、120#、200#、钛白粉、苯酐、DOP、异丙醇为主营产品，质量保证，价格优势，货源充足。

Methods for calculating the acetalization degree and the ratio of 1,2-and 1,4-additions according to the results of chemical analysis have also been suggested.

还提出了根据化学分析结果计算聚乙烯醇缩丁烯醛的缩醛度以及这两种加成方式的分率的方法。

The increasing of crosslinking extent in polyvinyl butenal had more contribution to adhesive strength of its aqueous solution than enhance of the acetalization degree.

在聚乙烯醇缩丁烯醛中发现，交联程度的提高比缩醛度的提高对其水溶液粘接强度的影响更大。

This mechanism is different from that for the acetalization reaction of polyvinyl alcohol with saturated aldehydes,which has only 1,2-addition.Crosslinking in polyvinyl butenal was mainly resulted from the 1,4-addition.

此机理不同于只有1，2-加成方式的聚乙烯醇缩饱和醛化反应。1，4-加成主要导致聚乙烯醇缩丁烯醛的交联。

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。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。