查询词典 quaternary ammonium compound

The purpose of this paper is to synthesize some phosphonium salts with PPh3 and some chiral quaternary ammonium salts with L-Valine. And we also use L-Valine and L-Phe-OMe to synthesize a new type catalyst —2,5-diketopiperazine , the simplest compound of cyclo-peptide.

本文利用廉价易得的三苯基磷和手性L-缬氨酸作为起始原料，合成了几种普通季鏻盐和手性季铵盐，并且利用L-缬氨酸与L-苯丙氨酸甲酯反应，合成了一种新型的相转移催化剂——2，5-二酮哌嗪环类的化合物。

A quaternary ammonium salt compound with a long chain of 12 carbon atoms was synthesized and used as an antistatic agent to be added into plasticized poly, and the structure and properties of such PVC materials were studied by surface resistivity, mechanical property and scanning electronic microscope tests.

合成了一种长链季铵盐类化合物，将其用作抗静电剂添加到软质聚氯乙烯材料中，测试了材料的表面电阻、力学性能，并采用扫描电子显微镜测试研究了其结构。

Ethylene oxide, composite aldehydes, quaternary ammonium salt-type compound, surfactant, activity factor, chelator.

环氧乙烷、复合醛类、复合季铵盐类、表面活性剂、活性因子、螯合剂。

Quaternary ammonium compound category, chlorine dioxide, ethylene oxide, composite aldehydes, chelating agent, surfactant, the activity factor.

复合季铵盐类、二氧化氯、环氧乙烷、复合醛类、螯合剂、表面活性剂、活性因子。

Ethylene oxide, chlorine dioxide, composite aldehydes, quaternary ammonium salt-type compound, surfactant, activity factor, chelator.

环氧乙烷、二氧化氯、复合醛类、复合季铵盐类、表面活性剂、活性因子、螯合剂。

The chloromethyl benzoate was first introduced as spacerarm between SW and BSA to synthesize SW quaternary ammonium salt compound , after every compounds were identified by poppen analysis, then to get SW-BSA by the methord of EDC.

引入对氯甲基苯甲酸作为SW与BSA之间偶联的间隔臂，通过化学合成的方法，先合成。。。

Optimum conditions are as follows: DMF is used as solvent, compound quaternary ammonium salt as catalyst, n(p-nitrochloro benzene):n=1: 1.2, m:m(p-nitrochloro benzene)=4%, m:m(p-nitrochloro benzene)1:1, and reacted under 155~160℃ for 18 h; reduction reaction is carried out in methanol with Raney nickel, which is used as catalyst; the raw product is added an antioxidant, and distilled simply under reduced pressure to obtain 4-fluoroaniline with excellence quality, purity is over 99.5%, total yield is 89.3%.

实验结果表明，氟化反应的最佳条件为：二甲基甲酰胺为溶剂、复合季铵盐为催化剂，n：n=1：1.2，m（催化剂：m=4%，m：m=1：1，于155~160℃下反应18h；还原反应在甲醇中进行，以阮内镍为催化剂；粗产品加入抗氧剂，减压条件下简单蒸馏得高品位的对氟苯胺。

Result A strain of Pseudomonas cepacia was detected in 1.6% compound quaternary ammonium disinfectant before application. The amount of the germ was 1.21×105cfu/ml. The strain had the similar resistance to chlorine-containing disinfectants and glutaraldehyde compared with Staphy aureus. The contaminated disinfectant could still thoroughly destroy the antigenicity of HBsAg with 60min's contact after diluted for 5-20 times.

结果 该洋葱假单胞菌对氯和戊二醛的抗力与大肠杆菌和金黄色葡萄球菌接近，污染样液除菌后1 000倍稀释对大肠杆菌和金黄色葡萄球菌仍有较好的杀菌效果，20倍稀释可完全破坏HBsAg抗原性，和抑制枯草杆菌黑色变种芽胞的生长，1 600倍稀释可抑制白色念珠菌生长，而原液则不能抑制分离菌株的生长。

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。