Sodium percarbonate crystal modifying agent and preparation process thereof

Abstract

A crystallizing modifier of sodium percarbonate is prepared through dissolving phosphate in water, adding Na2EDTA, hydroxyethylene diphosphonic acid, ethyldiamine tetramethylene phosphonic acid and sodium polyacrylate, and stirring.

Description

technical field [0001] The invention relates to a sodium percarbonate crystal modifier and a preparation method thereof, belonging to the technical field of fine chemicals. Background technique [0002] Sodium percarbonate (SPC for short), also known as sodium percarbonate, has a molecular formula of 2Na 2 CO 3 ·3H 2 o 2 , is a white, loose, fluid granule or powder solid, odorless, non-toxic, soluble in water. It is a new type of oxygen-based bleaching agent, which not only has the function of bleaching, but also has the functions of disinfection, sterilization, and degreasing. It is a fine chemical product with a wide range of uses and broad development prospects. Sodium percarbonate is usually prepared by the reaction of sodium carbonate and hydrogen peroxide. The preparation method is divided into dry process and wet process according to the state of sodium carbonate participating in the reaction, but the final product sodium percarbonate is mostly crystallized into p...

AI Technical Summary

Problems solved by technology

Sodium percarbonate is usually prepared by the reaction of sodium carbonate and hydrogen peroxide. The preparation method is divided into dry process and wet process according to the state of sodium carbonate participating in the reaction, but the final product sodium percarbonate is mostly crystallized into powder shape, and its filterability is poor. When sodium percarbonate crystals and their mother liquor are separated into solid and liquid, the sodium percarbonate product is easy to attach to the filter cloth to block the filter holes, so that the water content of the filtered product is relatively high, and finally passes through the fluidized bed When drying, it is necessary to increase the drying temperature, thereby reducing the content of active oxygen

Especially in the follow-up application of sodium percarbonate, such as washing powder additives, powdered sodium percarbonate has a larger surface area than granular sodium percarbonate with high bulk density, and is more easily decomposed by the external environment and has a high loss of active oxygen.

In order to obtain better granular products, some have added a mechanical granulation process before drying in a fluidized bed, but this has increased production costs; some have added sodium silicate, organic phosphonic acid, ethylenediamine to the reaction. Additives such as tetraacetic acid, but its purpose is to react with sodium carbonate aqueous solution through hydration and emulsification, so that the clean reaction with hydrogen peroxide is sufficiently rapid