Process and equipment for synthesis of sub-micron 4A zeolite with continuous crystallization

Abstract

A process for synthesizing submicron 4A zeolite by a continuous crystallization method comprises steps as follows: a sodium silicate solution with a certain concentration and a sodium aluminate solution with a certain concentration rapidly react and gel in a linear high-shear emulsifying machine; the gelled product is heated for crystallization in a controllable temperature tubular flowing crystallization reactor; then the crystallized product is washed and filtrated by a continuous filtering apparatus; and finally submicron 4A zeolite is obtained after drying. The invention has the advantages of simple and easy process method for synthesizing zeolite, small device, high preparation efficiency, continuous operation, and average grain diameter of synthesized submicron 4A zeolite smaller than 1 micron.

Description

A process and equipment for synthesizing submicron 4A zeolite by continuous crystallization technical field The invention belongs to a synthesis process and equipment for submicron 4A zeolite, in particular to a method and equipment for synthesizing submicron 4A zeolite by continuous crystallization. Background technique The synthesis method of 4A zeolite is mainly completed under the agitation of the reactor, as reported in U.S. Patent 4469036, adopts two-step process to synthesize 4A zeolite; in Chinese Patent 1775675A (Notice No.), it is reported that 4A zeolite is synthesized by graded kettle type continuous crystallization process In addition, AkiraYoshida et al described the process of two-step synthesis of 4A zeolite in Zeolite Magazine, 1991, volume 11, page 94 "Preparation of 4A zeolite from water glass". The average particle size of 4A zeolite synthesized by these processes is usually 2-4 microns, and the distribution is wide, resulting in poor application effect...

AI Technical Summary

Problems solved by technology

The average particle size of 4A zeolite synthesized by these processes is usually 2-4 microns, and the distribution is wide, resulting in poor application effect in detergents (mainly because 4A zeolite is insoluble in water, and large particles are easy to deposit into clothes or sewer pipes)

Images