Synthesis method of NaY molecular sieve

Abstract

The process of synthesizing NaY molecular sieve includes the following steps: synthesizing guide agent; mixing the guide agent, water glass, acid aluminum salt and sodium aluminate to obtain gel; crystallizing the gel; and filtering, washing and drying. The preparation process features the step of crystallizing the gel, and the step includes first crystallization at 80-120 deg.c for 0.1-70 hr and subsequent addition of one kind of acid matter in the amount of molar ratio to Al2O3 in the gel in 0.01-3 before further crystallization.

Description

technical field [0001] The invention relates to a synthesis method of NaY molecular sieve. Background technique [0002] Y-type molecular sieve with faujasite crystal structure is the main raw material for preparing catalytic cracking catalyst. At present, the methods for producing NaY molecular sieves in industry basically adopt the directing agent method proposed in USP3,639,099 and USP 3,671,191 by Grace Company of the United States. The method is to prepare the composition of (15 ~ 17) Na 2 O:Al 2 o 3 :(14~16)SiO 2 :(285~357)H 2 O, a directing agent whose crystal nucleus particle size is generally less than 0.05 microns, and then mixed with water glass, sodium aluminate, aluminum sulfate, etc. to prepare a composition of (3-6) Na 2 O:Al 2 o 3 :(8~12)SiO 2 :(120~200)H 2 O, and then crystallize this mixture at around 100°C. Since then, the methods for synthesizing NaY molecular sieves without templates proposed by people are similar to the above-mentioned method...

AI Technical Summary

Problems solved by technology

GB 2131597 discloses a method for preparing Y-type molecular sieves with a silicon-aluminum ratio of 5.3-6 by reducing the alkalinity of the synthetic gel, but this method significantly prolongs the crystallization time