A method for continuous production of sodium hypophosphite

Abstract

The application discloses a continuous production method of sodium hypophosphite, which comprises the following steps: continuously feeding liquid yellow phosphorus and alkali liquor into a vertical continuous reactor respectively, and continuously generating a water phase product liquid containing sodium hypophosphite through liquid-liquid two-phase alkaline hydrolysis reaction of the yellow phosphorus; the liquid phase of the yellow phosphorus and the alkali liquor form an adjustable phase state organization in the vertical continuous reactor, the adjustable phase state organization at least comprises a first phase state organization and a second phase state organization, in the first phase state organization, the yellow phosphorus is taken as a continuous phase, and the alkaline water phase is taken as a dispersed phase to form a rapid reaction area; in the second phase state organization, the alkaline water phase is taken as a continuous phase, and the yellow phosphorus is taken as a dispersed phase to form a ripening reaction area; the application realizes the significant improvement of the yellow phosphorus conversion rate, the great reduction of residual alkali and phosphite indicators of the product liquid, the improvement of the product quality, the great optimization of the production economy, and the continuous, large-scale and safe production of the sodium hypophosphite.