Water column forming method of spherical molecular sieve

Abstract

The invention relates to a water column forming method of a spherical molecular sieve. The water column forming method is characterized by comprising the following steps: 1, beating a molecular sieve, a binding agent and water uniformly; 2, adding an alginate solution, and stirring uniformly at high speed to prepare a suspended sizing agent; 3, dropping the suspended sizing agent to a polyvalent metal cation water solution to form gel particles; and 4, taking the gel particles out, drying and roasting to obtain the product, wherein the dry-basis mass rate of the molecular sieve to the binding agent in the step 1 is (0.2-3):1, and the binding agent is alumina hydrogel, nanometer aluminum oxide sol or silica sol; the soluble alginate in the step 2 is one or more of sodium alginate, potassium alginate, magnesium alginate and ammonium alginate, the content of alginate in the suspended sizing agent is 0.3-5w%, and total dry-basis content of the molecular sieve and the binding agent in the suspended sizing agent is 5-30w%; the polyvalent metal cation water solution in the step 3 is a saline solution containing aluminum, zinc, calcium, copper, ferrum, ferrous, cobalt, manganese or nickel ions, with the saturation concentration being 0.1mol / L.

Description

technical field [0001] The invention belongs to the technical field of catalyst carriers and relates to a water column forming method for spherical molecular sieves. technical background [0002] Shaping is an important process in the catalyst preparation process. Catalyst particles with suitable shape, size, strength and pore structure can be prepared by molding. Among them, spherical particles are regarded as the most ideal shape due to their advantages of uniform packing, reduced bed pressure, good wear resistance, and easy loading / unloading. [0003] Molecular sieves are widely used in petrochemical and fine chemical industries because of their unique pore structure and good catalytic performance. At present, most of the spherical molecular sieves used in industry are formed by traditional rolling method or oil (ammonia) column method. However, due to the poor cohesiveness of molecular sieves, its molding is relatively difficult and the molding cost is also high. Most...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a water column molding method for spherical molecular sieves, so as to overcome the defects of dust, environmental pollution, and high energy consumption during the molding process.