查询词典 propanoic acid

The article introduced the methods o f synthesizing propanoic acid ,its p rocess technologies,production,and application at home and abroad.

介绍了丙酸的各种合成方法、工艺流程及国内外丙酸的生产和应用情况，分析了各种方法的优缺点，对我国发展丙酸生产提出了建议。

The effect of intermediate structure on the properties of propanoic acid polyethers

以丙酸和三光气为原料，用三光气法合成了纯度较高的丙酰氯。

As an important fine chemical materical, propanoic acid is widely used in many fields, such as food additive, feed additive, pesticide, medicine, essence, organic solvent, chemical reagent, etc.

丙酸是一种重要的精细化工中间体，它广泛应用于食品和饲料添加剂、农药、医药、香精、有机溶剂，化学试剂等领域。

At the same time, the molecular weightdistribution of the product is narrow Based on this novel process, weprepared a series of propanoic acid polyethers containing differentEO/PO. Their properties were determined and the effects of intermediates"sstructure on the final products" performance were obtained.

以此丁艺为基础，由不同E0、PO加成数的中间体合成了FA系列丙酸酯醚，测试了它们的各项性能指标，总结了中间体结构对产品性能的影响规律。

An improved Adler method was used for preparing TAPPH〓. TAPPH〓 was synthesized in high yield by direct condensation of pyrrole with 4aminobenzaldehyde in refluxing propanoic acid with the presence of vitamin C. This new synthetic strategy for preparing TAPPH〓 can greatly extend synthetic methods for porphyrins containing amino groups.

我们通过对Adler法的合成条件进行改进，即在反应体系中加入还原剂Vc，由4-氨基苯甲醛直接合成了对酸敏感的TAPPH〓（1），提高了总收率，拓宽了Adler法的适用范围。

But in fermented juice, the most of volatile components is esters, about 74.92%, the propanoic acid, 2-hydroxy-, butyl ester is 64.36%.

而在诺丽鲜果中脂肪酸是主要的挥发性成分，占总挥发性成分43.34%，十八烯酸就占了20.34%；在诺丽发酵汁中主要的挥发性成分是酯类，占了总挥发性成分的74.92%，而2-羟基丙酸丁酯就占了64.36％。

Propanoic acid, 2-methyl-, monoester with 2,2,4-trimethyl-1,3-pentanediol

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EPL makes use of short wave band glare to kill propanoic acid bacillus of acne inner , makes use of red light , infrared brightness to lower as well as radio-frequency current removes a color while the combination effect reducing sebaceous gland activity and , stimulates the deep collagen hyperplasia , restores a scar.

EPL利用短波段的强光杀死痤疮内的丙酸杆菌，并利用红光、红外光以及射频电流组合作用在降低皮脂腺活性的同时消除色沉，刺激深层胶原增生，修复疤痕。

MS results revealed that 3- propionaldehyde was transferred into 3- propanol, 3- propanoic acid, 3 ethanol, 3- timonacic.

质谱鉴定其转化产物有甲硫基丙醇、甲硫基丙酸、甲硫基乙醇、甲硫基丙烯。

Polyurethane-acrylics hybrid latexes were prepared using isophorone diisocyanate, dimethylol propanoic acid and polypropylene oxides of different molecular weights as main materials for PU component, and butyl acrylate, methyl methacrylate and a crosslinker, trihydroxymethyl propanetriacrylate as main acrylic monomers. Hydroxyethyl acrylate was used as the coupling agent between PU and AC.

以异佛尔酮二异氰酸酯、二羟甲基丙酸和聚丙醚二醇等为聚氨酯原料，丙烯酸丁酯、甲基丙烯酸甲酯、三羟甲基丙烷三丙烯酸酯为丙烯酸酯类单体，丙烯酸羟乙酯为聚氨酯和聚丙烯酸酯间的偶联剂合成了丙烯酸酯改性水性聚氨酯乳液。

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。