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为了寻找更准确的且可測定帶色混合物中样品的方法,作者注意到及提出的方法。此法基于匹拉米洞和50%沸苛性鉀作用时發生定量的分解,产生二甲基胺。用标准矿酸溶液收集二甲基胺,在适当的指示剂下,以标准鹼溶液測定过剩的酸。由于上法中苛性鉀用量大,作者試以价格便宜容易得到的苛性鈉替代之。当匹拉米洞与濃苛性鈉溶液在定氮瓶中共热吋,通入水蒸汽,匹拉米洞分解产生二甲基胺的反应进行慢、不显著。經过进一步研究,發現匹拉米洞中的二甲氨基可轉成二甲、酰胺基,后者与鹼作用容易定量地分解产生二甲基胺。因此如將样品充分地氧化使成二氧匹拉米洞,当与鹼作用时,其中的二甲、酰胺基即定量地分解,产生二甲基胺。
In order to find a more accurate and measurable method of color samples in the mixture, the authors note and proposed method. This method based on the Pamir hole and 50% boiling potassium role occurred quantitative decomposition, resulting in dimethylamine. Dimethylamine is collected using a standard mineral acid solution and the excess acid is measured with a standard base solution under the appropriate indicator. Due to the large amount of caustic potash used in the process, the authors try to replace it with caustic soda, which is readily available at a cheap price. When the Pamiam hole and concentrated caustic soda solution in nitrogen bottle co-heated inch, access to water vapor, Pyramid hole decomposition of dimethyl amine reaction slow, not significant. After further study, it was found that the dimethylamino group in the pami-meter hole can be converted into dimethyl and amido groups, and the latter is easily and quantitatively decomposed to produce dimethylamine. Therefore, if the sample is sufficiently oxidized to form a dihydropalmatine hole, the dimethyl and amido groups therein decompose quantitatively when acting on the base to produce dimethylamine.