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用于合成纤維或合成橡胶的丙烯腈单体,对其中含有氰氫酸杂质的要求都很高,从一般商品所訂定的規格来看,最高含量不能超过5 ppm(0.0005%),因此必需选擇可靠的測定方法,才能保证这項质量指标的鉴定。文献中对于氰化物的測定方法,已有不少专著詳述,但应用于丙烯腈中微量氰氫酸測定的报导却不多。莫特(R.L Maute)曾評述过使用酚酞啉(phenolphthalin)比色法,丹尼斯(Deniges)滴定法及电位滴定法的測定結果。认为在总氰量(包括結合成乳腈lactonitrile的含氰量)或游离氰氫酸的
The acrylonitrile monomer used in synthetic fibers or synthetic rubbers contains high requirements for the impurities containing cyanuric acid. The maximum content can not exceed 5 ppm (0.0005%) according to the specifications set by the general merchandise, so it is necessary Choose a reliable method of determination, in order to ensure the identification of this quality index. Literature for the determination of cyanide methods, many monographs have been detailed, but the application of trace cyanuric acid in acrylonitrile is not reported. R.L Maute has reviewed the results using phenolphthalin colorimetry, Deniges titration, and potentiometric titration. The total amount of cyanogens (including the amount of cyanogens incorporated into the lactonitrile lactonitrile) or the free cyanhydric acid is considered