Synthetic process of coal-series kaolin X-type zeolite molecular sieve

Abstract

The invention discloses a synthetic process of a coal-series kaolin X-type zeolite molecular sieve. The synthetic process includes the steps of 1) fully dissolving the kaolin and sodium silicate in water in a reaction kettle, slowly adding sodium hydroxide under intensive stirring, adding a crystal seed, and stirring and aging the mixture for 4-6 h at room temperature; and 2) performing stirring crystallization at 60-80 DEG C for 2-4 h, and continuously performing stirring crystallization at 90-100 DEG C for 12-48 h, and washing a crystallized product with water until pH is 11, and drying the product to obtain the X-type zeolite molecular sieve. In the invention, the coal-series kaolin from the Inner Mongolia is employed to replace conventional chemical engineering raw materials, so that the process is low in cost. The X-type zeolite molecular sieve is higher than 32.4 wt% in water absorbency rate. The process also increases utilization rate and additional value of the coal-series kaolin from the Inner Mongolia and also has the advantage of saving energy and reducing emission, and comprehensively utilizing resources.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a synthesis process of coal series kaolin X-type zeolite molecular sieve. Background technique [0002] Zeolite molecular sieves have the structure and characteristics of crystals, the surface is a solid skeleton, and the internal holes can play the role of adsorbing molecules. The pores are connected with each other by channels, and the molecules pass through the channels. Molecular sieves have a very uniform pore size distribution due to the crystalline nature of the pores. Molecular sieves selectively adsorb molecules according to the size of the pores inside their crystals, that is, adsorb molecules of a certain size and repel molecules of larger substances, so they are vividly called "molecular sieves". In the current synthesis process of coal-based kaolin X-type zeolite molecular sieve, the technological process is not easy to implement, the resul...

AI Technical Summary

Problems solved by technology

In the current synthesis process of coal-based kaolin X-type zeolite molecular sieve, the technological process is not easy to implement, the resulting zeolite molecular sieve has low purity, and the reaction residue cannot be recycled. The production process is complicated, the production efficiency is low, and the cost is high. suitable for mass production