The effects were studied on the preparation of ethyl vanillin from urotropin, and a kind of metal oxide was used as catalyst to increase the yields and decrease the cost for the commercial application. 本文就乌洛托品法合成乙基香兰素的各种因素对实验结果的影响进行了详尽的研究,同时应用一种金属氧化物作为反应的催化剂,提高了产率,降低了成本,有利于工业化生产。
Methods Aromatic aldehyde and 2, 4-pentanedione was used as the starting materials, which were dissolved in ethyl acetate in the presence of boron oxide and n-butylamine. The reaction was kept at 80 ℃ for 3 h. 方法分别用芳醛和2,4-戊二酮的硼化合物为原料在正丁胺的催化作用下,80℃反应3h,合成目标化合物;
Alternating with silica sol and ethyl silicate binder as the binder using on the back layer of zirconium oxide ceramic can improve the mould strength, while providing a good deformability of the mould. 采用硅溶胶和硅酸乙酯交替作为背层粘结剂可以改善氧化锆陶瓷型壳的强度,同时能够具有良好的退让性。
In this paper, the synthesis process of acetylacetone has been studied, using ethyl acetoacetate and acetic anhydride as raw materials,. magnesium oxide as catalyst. 本文研究了以乙酰乙酸乙酯和乙酸酐为原料、氧化镁为催化剂,合成乙酰丙酮的工艺。
The butanone conversion rate and ethyl acetate yield catalyzed with nickel oxide and cupric oxide were lower than that of Ni silica gel but higher than Cu silica gel. 氧化镍和氧化铜催化氧化丁酮,丁酮转化率和乙酸乙酯的得率低于镍硅胶催化剂,高于铜硅胶催化剂。