Preparation method for hydroxylammonium chloride

The invention discloses a preparation method for hydroxylammonium chloride. The method comprises the following steps: in a rectifying column, subjecting a raw material, i.e., ketoxime hydrochloride, to hydrolysis reaction in an aqueous solution so as to generate hydroxylammonium chloride and ketone, discharging the ketone from the top of the rectifying column, and subjecting a hydroxylammonium chloride solution produced from the bottom of the rectifying column to cooling, crystallization and drying so as to obtain a hydroxylammonium chloride product. Compared with the prior art, the preparation method for hydroxylammonium chloride provided by the invention has the following significant advantages: (1) the byproduct ketoxime hydrochloride in the production process of ketoxime type silane is used as a raw material, so cost of treating ketoxime hydrochloride in the production process of ketoxime type silane is reduced, and acid cost of production of hydroxylammonium chloride is saved at the same time; and (2) the use of the byproduct ketoxime hydrochloride in the production process of ketoxime type silane as the raw material is favorable for circulation of process water in a production system and greatly reduces wastewater discharge of production equipment.