Prepn of sodium percarbonate

Abstract

The present invention relates to a preparation of percarbonate. Sodium carbonate solution and hydrogen peroxide solution are added dropwise simultaneously into reactor to prepare sodium percarbonate.The process features the addition of silicate to sodium carbonate solution, the addition of one or more of soluble magnesium salt, organic phosphonic acid, ethylenediamine tetraacetic acid and their salt to hydrogen peroxide solution, and the molar ratio between sodium carbonate and hydrogen peroxide of 0.5-1. The improved wet process of preparing sodium percarbonate has high reaction stability, increased active oxygen content in sodium percarbonate, and improved wet and hot stability.

Description

technical field

[0001] The invention relates to a preparation method of sodium percarbonate, which belongs to the technical field of preparation of peroxy salts in inorganic chemistry. Background technique

[0002] Sodium percarbonate, also known as sodium carbonate peroxide hydrate, has a molecular formula of 2Na 2 CO 3 ·3H 2 o 2 , its theoretical active oxygen content is 15.28%, and its main function is to provide oxygen source. The preparation method of existing sodium percarbonate mainly contains two kinds of wet method and dry method. Dry production is to directly spray hydrogen peroxide onto the surface of sodium carbonate. Although the sodium percarbonate produced by this method has good moisture and thermal stability, the production process is relatively complicated, and the raw material requirements are high, and the product active oxygen The content is relatively low, generally between 12 and 13%. Wet production is a product made by reacti...