Method for synthesizing high-silicon mordenite in the absence of amine

Abstract

The invention discloses a method for preparing high silica mordenite without amine. The method employs silicon, alumina and deionized water as raw amaterial, and employs polyatomic alcohol as addictive; proceeds thermal crystallization in steeless autoclave interlined with politef, the crystallization temperature is 120-200 Deg. C and time is 12-240 hours; sucts, washes and dried the mixture got after crystallization and gets high silia mordenite with molar proportion of SiO2 / Al2O3 is 15-30:1. The invention employs pentaerythrite which is cheap, abundant and environment-friendly to replace the organic amine which is dear and environment-pollutant, and uses no inorganic acid or alkali corrosive to device. The pentaerythrite is helpful for generation of high silica mordenite and for reducing crystallization time. The invention is characterized by low production cost, high output, simple process and environment-friendly.

Description

technical field [0001] The invention belongs to a method for synthesizing zeolite molecular sieves, in particular to a method for synthesizing high-silicon mordenite without amine. Background technique [0002] Mordenite can be used as an adsorbent for gas or liquid separation; it can also be used as a good catalyst for catalytic cracking, alkylation, isomerization, disproportionation and transalkylation, reforming, dewaxing, Methanol amination and other catalytic processes. [0003] Natural or early synthetic mordenite, its SiO 2 / Al 2 o 3 The molar ratio is usually around 10. However, for certain reactions, such as toluene disproportionation and transalkylation reactions, high silicon (SiO 2 / Al 2 o 3 molar ratio > 10) mordenite exhibits higher catalytic activity, selectivity and stability. [0004] At present, there are generally two ways to prepare high-silica mordenite: one is to use low-silicon (SiO 2 / Al 2 o 3 molar ratio ≤ 10) mordenite as the starting ...

AI Technical Summary

Problems solved by technology

[0013] It can be seen from the above-mentioned patents or documents that the current amine-free synthesis of high-silica mordenite does not use toxic and expensive organic amines, but the additives used such as inorganic ammonia, anionic surfactants, caprolactam, fluorine Chemicals, etc., there are also problems such as pollution to the environment, high price, low product quality, complex process, etc.; and most of them need to use inorganic acid or inorganic alkali, which is easy to cause environmental pollution, equipment corrosion, etc.