Organic Component Analysis Study For The Potassium Chloride Of Potassium Nitrate Production Raw Material

Potassium nitrate（KNO₃） is a kind of high quality without chloride fertilizer and inorganic chemical products. It has widely used in agriculture and industry. There are four main KNO₃ production in domestic and foreign, and the double decomposition reaction is the production mainly adopts in our country. When potassium chloride（KCl） as raw material imported by Russia was used to product potassium nitrate, after cooling crystallization, the by-product ammonium chloride（NHCl4） was floated above the solution. But when the domestic KCl was used to product KNO₃ the solution was clear and had no suspended solids. It would lead to KNO₃ difficult to separate. The paper conduct a study for this phenomenon, and the content mainly includes following three aspects.In the first place, the paper speculated the reason why caused that phenomenon was that the trace organic components in the two kinds of KCl was different. Therefore an extraction method was to put forward. The small amount of organic matter in KCl was to extract by different polar solvent. And the solvent were methanol, acetone, chloroform carbon tetrachloride and normal hexane. Then the extractives were added to the double decomposition reaction which used domestic KCl as a raw material and observed the phenomenon. According to the reaction current, if the solution of the upper has suspended solids, the extraction was considered available and the solvent was considered to be effective. At the same time, the solvent extraction rate was calculated. In the end, the extraction method indicated that the best solvent is chloroform. Its extract could make the by-product NHCl4 flotation. And extract three times was best. It had high extraction rate. After three extraction, the extraction rate was 99.1%.Secondly, using chloroform to sample processing, a gas chromatography-tandem mass spectrometry（GC-MS） qualitative analysis method has been established by optimizing the chromatographic conditions. At the same time, the qualitative analysis was combined with Fourier transform infrared spectroscopy（FTIR）. The results showed that: the import potassium chloride extract ingredients mainly for fatty amine substance. There were hexadecylamine, oleylamine and octadecylamine, constituting 11.56%, 25.83%, 18.97% of total peak area respectively. In addition to this, there were some esters, such as tris（2-chloroethyl）phosphate,4.80% of total peak area; triethyl citrate, 2.08 of total peak area. The domestic potassium chloride extract ingredient mainly for octadecyl morpholine, constituting 21.95% of total peak area. There were other compositions. There were alkanes, such as n-hexadecane, heptadecane, nonadecane; phenols, such as 2,4-di-tert-butylphenol; esters, such as dioctyl phthalate. The extract ingredients were much, but the proportion was little respectively. The method is effective in separation of extract and has high accuracy, good reproducibility. According the identification result to know, the production process of two kinds of KCl is different. Import KCl is positive flotation production technology, and domestic KCl production technology is reverse flotation.The trace organic components of the product of decomposition reaction KNO₃ was extracted by the same way like the trace organic components of KCl. Then the pomponents was analyzed by GC-MS. It can monitor the reaction system of flotation conditions. The results showed that: the main organic components of KNO₃ were five kinds of ester substances, like dibutyl phthealate, triethyl citrate and so on. There were no amine substance. It can be seen that the amine substance from raw material import KCl concentrated to the NHCl4 products. It has no flotation effect on KNO₃. It can provide guidance for the speculation of flotation mechanism in reaction system and the optimizing reaction conditions in the production of KNO₃.