T type molecular sieve membrane containing rich erionite, preparation and application in gas separation

Abstract

The invention provides a T type molecular sieve membrane rich in erionite and a preparation method as well as the application in air separating thereof. The invention is characterized in that an erionite crystal is adopted as a seed crystal to synthesize the T type molecular sieve membrane which is rich in erionite and has excellent shape-selective separation effect; by adopting the method of high-temperature and closed type hydro-thermal synthesis reaction, the synthesizing time of the membrane is shortened, what is more, the stability of the T type molecular sieve membrane under the high temperature is enhanced, thus, the service life of the membrane can be greatly prolonged and the requirements of separating CO2 with blast furnace gas under high temperature can be satisfied. The T type molecular sieve membrane with high performance can be synthesized in larger sol synthesizing and matching range; the sol matching range of the test is that SiO2 / AL2O3 is equal to 10 to 160; OH<-> / SiO2 is equal to 0.55 to 0.85; Na<+> / (Na<+>+K<+>) is equal to 0.6 to 0.8; H2O / (Na<+>+K<+>) is equal to 15 to 160; tubular supporting bodies of various materials (mullite, Alpha-Al2O3 and stainless steel) are adopted so as to adapt to various industrial application occasions. Simultaneously, an air method and an air separating device are provided. The flux and the separation factor of a CO2 / CH4 (50 / 50mol percent) system under an optimizing condition for synthesizing the membrane at the temperature of 200 DGC C respectively reach as high as 1038GPU (10<-6>cm<3>.cm<-2>.s<-1>.cmHg<-1>) and 535.

Description

technical field [0001] The invention provides a method for conveniently preparing a high-performance T-type molecular sieve membrane suitable for industrial applications, relates to a gas separation method and a gas separation device, and belongs to the field of inorganic membrane material preparation and gas separation applications. Background technique [0002] As people pay more attention to the global environment, man-made CO emissions 2 need to be collected and stored, industrial CO emissions 2 will be strictly controlled. Contains CO 2 The two most promising fields for the separation of mixed gases are CO in blast furnace gas 2 CO capture and natural gas 2 separation, both of which can significantly reduce CO 2 Gas emissions, reducing global warming. At the same time, CO in natural gas 2 Separation has enormous economic benefits. [0003] Traditional CO 2 There are pressure swing adsorption, cryogenic and other methods for the separation of mixed gases. The m...

AI Technical Summary

Problems solved by technology

Although the membrane has high separation selectivity, the permeate flux is relatively small

At the same time, the film needs to add expensive 1-adamantane template agent and coated seed crystals during the synthesis process (seed crystal synthesis requires >20d synthesis cycle), and the film can only be used after high temperature calcination, its high cost and Complicated processes have greatly hindered its application

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