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11~#催化剂的研制成功对我厂乙苯脱氢制苯乙烯的产量上升起着重要的作用。它是由氧化铁、钾盐、铬盐和稀土金属的氧化物以及水泥与羧甲基纤维素钠盐混炼而成。在这样复杂的体系中测定铬,若采用化学分析是较为困难的。使用比色法测定铬,手续也较繁琐。近年来,对于应用原子吸收光谱法(简称AAS法)测定岩石、矿物、钢铁、土壤以及废水中铬的含量,国内外已均有文献报导。但应用空气/乙炔火焰测定铬时若干元素如Fe、Si、Ni等均有干扰。为了消除干扰,可采用标准加入法或用N_2O/C_2H_2火焰或加入抑制剂或将铬萃入MIBK后再测定,或用离子交换剂除去干扰离子,或用8-羟基喹啉作释放剂以抑制干扰等等,方法众多、各有千秋,本文介绍的是用Na_SO_4作为抑制多种干扰元素的办法,并探索了影响铬原子化操作条件的若干
The successful development of 11 ~ # catalyst plays an important role in the increase of styrene production from ethylbenzene dehydrogenation in our plant. It is made of iron oxide, potassium salt, chromium salts and oxides of rare earth metals and sodium carboxymethyl cellulose and cellulose. Determination of chromium in such a complex system is more difficult if chemical analysis is used. The use of colorimetric determination of chromium, procedures are more cumbersome. In recent years, the application of atomic absorption spectrometry (AAS) for the determination of rock, mineral, steel, soil and wastewater chromium content, both at home and abroad have been reported. However, the application of air / acetylene flame chromium determination of a number of elements such as Fe, Si, Ni, etc. have interference. In order to eliminate the interference, it can be determined by standard addition method or flame with N 2 O 2 / C 2 H 2 or adding inhibitors or extracting chromium into MIBK, or removing ionized ions by using ion exchangers or using 8-hydroxyquinoline as a releasing agent to suppress Interference and so on, many ways, each has its advantages and disadvantages, this article describes the use of Na_SO_4 as a way to suppress a variety of interfering elements and explores the impact of chromium atomization operating conditions