Synthetic method for MCM-22 molecular sieve

Abstract

A method for synthesizing MCM-22 molecular screen, which possesses MWW topological structure, employing silicon, aluminium, alkali, mould agent and deionized water as reacting raw material, blooming under the temperature of 135-185 Deg C for some time, hydrothermal synthesizing the needed molecular screen; the invention is characterized by using diamin liquid mixture (BA) as mould agent to prepare molecular screen, one (SDAI) is hexamethylene amine (HMI), another (SDA2) is any one of the followings: cyclohexylamine (CHA)or buta (BuA) or isopropyl amine (IPA).

Description

technical field

[0001] The invention relates to a method for synthesizing molecular sieves. Specifically, it is a method for synthesizing molecular sieves with MCM-22 molecular sieve crystal phase structure. Background technique

[0002] MCM-22 molecular sieve (USP 4,954,325) is a molecular sieve with two non-intersecting pore systems, which contains two pore systems of 12-membered ring and 10-membered ring, and the template used is generally hexamethyleneimine. MCM-22 exhibits excellent performance in a variety of catalytic reactions, such as MCM-22 for the alkylation of benzene and ethylene, with high activity, good selectivity for monoalkylbenzene (ethylbenzene), and low benzene / ethylene ratio (can be It can reduce the cost of reaction and rectification equipment); it can be used as an additive for catalytic cracking catalyst to improve catalytic cracking performance.

[0003] Generally speaking, the ratio of silicon to aluminum (SiO 2 / Al 2 o 3 ) of MCM-22 below 100...