Preparation of high-purity potassium cyanate

Abstract

The invention discloses a method for preparing high-purity potassium cyanate, which belongs to preparation of the potassium cyanate. The method takes industrial urea and potassium carbonate as raw materials and dimethyl sulfoxide or dimethyl formamide as a solvent, and adopts proper technological conditions: the reaction temperature is 130 DEG C, the reaction time is 8 hours, the mol ratio of the urea to the potassium carbonate is 3.5 to 1, and the mass ratio of the solvent to the urea is 7 to 1; the product with 96 percent (mass fraction) of the potassium cyanate can be obtained, and the obtained potassium cyanate is washed by adopting anhydrous alcohol as a detergent, wherein the amount of the detergent is 3 to 4 times of the volume of the potassium cyanate; and the potassium cyanate after washing is dried, and the potassium cyanate with the purity of more than 98 percent (mass fraction) can be obtained. The method has the advantages that the technology is simple and easy and the purity of the prepared potassium cyanate is as high as more than 98 percent (mass fraction).

Description

technical field [0001] The invention relates to a preparation method of potassium cyanate, in particular to a preparation method of high-purity potassium cyanate. Background technique [0002] Potassium cyanate is widely used in preparation of hypnotics and anesthetics, as herbicides, defoliants and organic synthesis, in addition, it is also widely used in glass manufacturing, ceramic art, metal surface hardening treatment, fertilizers, insecticides, etc. field. [0003] The methods for synthesizing potassium cyanate include solid-state melting method, absorption method, liquid phase absorption method, liquid-solid phase reaction method, etc. Among them, the liquid-solid phase reaction method has easy-to-get raw material sources, easy operation, easy separation from solvents, and good economy characteristics, suitable for industrial production. [0004] In the liquid-solid phase reaction method, the invention of Takayama Yoshihiro and Takagi Kiyoshi of Nippon Chemical Corp...

AI Technical Summary

Problems solved by technology

[0005] At present, there is a large demand for potassium cyanate products in the international market. Potassium cyanate produced in my country is mainly used for export, and there are very few manufacturers. There are immature processes and low potassium cyanate content in products, which cannot reach foreign countries Issues required by the manufacturer (>96%)