Preparation of AlPo-18 zeolite membrane and method for separating CO2 and N2 by adopting AlPo-18 zeolite membrane

Abstract

The invention provides preparation of an AlPo-18 zeolite membrane and a method for separating CO2 and N2 by adopting the AlPo-18 zeolite membrane. With the adoption of the prepared AlPo-18 zeolite membrane, CO2 / N2 mixed gas is separated under conditions of different feeding pressure, gas mole ratios and operating temperatures. The invention relates to a preparation method of a microporous phosphorous and aluminum zeolite membrane with an AEI (associated electrical industries) topological structure. The separation method is used for CO2 / N2 mixed gas separation at the temperature of 25-50 DEG C, under the condition that the feeding pressure is kept in a range from 0.3 MPa to 1.0 MPa, the permeation flux can reach 5.5*10<-7>mol / (m<2>*Pa*s), and the concentration of CO2 on the permeation side can be increased from 50% to higher than 96%. The separation method has high efficiency, the separation process is simple, the energy consumption is low, and the economic and social benefits are remarkable.

Description

technical field [0001] The present invention relates to a kind of preparation method of AlPO-18 molecular sieve film, and use this film to carry out CO 2 and N 2 The separation method belongs to the field of membrane separation gas. Background technique [0002] Since the industrial revolution, human beings have burned a large amount of fossil energy, making the CO in the atmosphere 2 The sharp increase in the content has led to the greenhouse effect, leading to global problems such as climate deterioration and sea level rise. Global CO emissions from burning fossil fuels each year 2 Reached 20 billion tons, accounting for about 82% of the amount of greenhouse gases. from rich CO 2 Separation, enrichment and recovery of CO from the mixed gas 2 , to reduce CO 2 Emissions are a direct way to tackle the greenhouse effect. These carbon-rich mixed gases include conventional gas, fuel oil, and flue gas produced by coal combustion. More than 95% of these gases are CO 2 / N...

AI Technical Summary

Problems solved by technology

Bernal et al. (American Institute of Chemical Engineers Journal, 2004, 50(1): 127-135.) synthesized a Na-ZSM-5 membrane with MFI configuration on the surface of tubular porous alumina and stainless steel supports, which is effective for CO 2 / N 2 Mixed gases exhibit up to 2.6×10 -6 mol / (m 2 ·Pa·s) permeation flux, but its selectivity is not high

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