Method for producing ammonium chloride with low potassium and sodium

Abstract

The invention discloses a method for producing ammonium chloride with low potassium and sodium. The method uses agricultural ammonium chloride as raw materials, and carries out a three-stage countercurrent washing with a cold ammonia mother liquor I, hot desalted water and other solvents to produce the ammonium chloride with low potassium and sodium. The method comprises the following steps: (1) mixing the agricultural ammonium chloride in a combined-soda production and the cold ammonia mother liquor I according to a certain proportion, stirring, and washing in the first stage; (2) washing using a circulating mother liquor I in the second stage; and (3) washing using the hot desalted water in the third stage. The method contacts with but does not influence the combined-soda production, has advantages of simple technology, low product cost, stable quality, no pollution, and prominent environmental protection effect.

Description

technical field [0001] The present invention relates to the production method of industrial ammonium chloride, specifically a kind of method of producing low-potassium sodium ammonium chloride. Background technique [0002] In the prior art, the new combined process of refined ammonium uses a two-stage washing method to produce refined ammonium. The first stage is mixed washing, that is, the mixed washing of agricultural ammonium and ammonia mother liquor I in the production of combined alkali; the second stage is circulation Washing method, that is, washing with circulating mother liquor, and continuously adding to remove CO in the circulating mother liquor 3 ２－ and SO ４ ２－ HCl and BaCl ２ ; Restricted by technological conditions, the combined method of refined ammonium can only produce first-class industrial ammonium chloride. [0003] There are four methods for producing low-potassium sodium ammonium chloride: sublimation method, crown ether organic solvent liquid ext...

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Problems solved by technology

This method has strong selectivity for impurity removal and high extraction efficiency. The main disadvantage is that crown ether is too expensive, and there are few manufacturers, so it is not easy to purchase. Therefore, this method is also uneconomical and not suitable for large-scale industrial production.

[0006] (3) Production of low-potassium sodium ammonium chloride by comprehensive impurity removal and purification method: the core process of comprehensive impurity removal and purification method is recrystallization, the process is simple, the product quality is good, and it can be used in large-scale industrial production. However, in agricultural ammonium chloride The sodium content is too high, and it is difficult to meet the requirements only by recrystallization purification. It must be supplemented by chemical impurity removal methods to meet the requirements, but this method has high energy consumption and great environmental protection pressure

[0007] (4) The production of low potassium sodium ammonium chloride by ion exchange / exclusion method is to pass a solution containing electrolyte and weak (non-) electrolyte through the ion exchange column, in which the exchangeable ions in the resin are the same as those in the electrolyte When the ions are of the same kind, the resin does not undergo an exchange reaction at this time, but only repels the electrolyte, but the non-(weak) electrolyte is delayed due to some affinity with the resin, so that the electrolyte and the weak (non-) electrolyte are separated. Effective separation method, the problem of this method is high energy consumption and low device capacity

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