Extraction agent for preparing potassium nitrate with nitric acid-potassium chloride extraction method

Abstract

The invention discloses an extraction agent for preparing potassium nitrate with a nitric acid-potassium chloride extraction method. The extraction agent is prepared from isoamyl alcohol, n-butyl alcohol, tri-n-octylaminetri-octyl tertiary amine, n-caprylic alcohol according to a volume ratio of 1 to (0.1 to 0.5) to (3 to 10) to (1.3 to 3). The extractant provided by the invention has a good extraction effect and high selectivity for hydrochloric acid in a nitric acid-potassium chloride reaction system, the hydrochloric acid can be extracted without while not extracting nitric acid, the nitricacid serving as a raw material is saved, the purity of the nitric acid serving as a by-product is improved; the nitric acid prepared by back extraction can be directly taken as a product for selling.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to an extractant used for preparing potassium nitrate by a nitric acid-potassium chloride extraction method. Background technique [0002] Potassium nitrate is one of the important chemical raw materials, widely used in various fields such as national defense, military industry, industry, agriculture, food additives, medicine, feed additives, optical glass and electronics industry. [0003] The nitric acid-potassium chloride extraction method uses potassium chloride and nitric acid as raw materials, and reacts at a low temperature of 5-10°C in the presence of an extractant to generate potassium nitrate and hydrochloric acid. The method uses an extractant to separate the hydrochloric acid in the reaction system, so that the reaction is relatively complete, and the generated potassium nitrate is continuously crystallized. Most of the extractants currently used are isoamyl a...

AI Technical Summary

Problems solved by technology

Most of the extractants currently used are isoamyl alcohol. Although isoamyl alcohol can remove hydrochloric acid from the reaction system, it also has an extraction effect on nitric acid, which increases the loss of raw material nitric acid and increases the difficulty of the stripping process. And the by-product hydrochloric acid is often mixed with nitric acid