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Applications and Separation Properties of Sub-nano Ceramic Membranes

Types and applications of sub-nano ceramic membrane

Below are the types of NGK sub-nano ceramic membranes currently available, and some examples of their applications. Examples of systems incorporating these membranes are introduced in 1)– 3). These are under development.

  Applications Separation target
Gas separation ・CO2 recovery from associated gas of CO2-EOR
・CO2 separation from natural gas 1)
・Biogas purification 3)
・He recovery from natural gas He/CH4
・H2 separation for chemical process
・H2 recovery from reaction gas
・N2 separation from natural gas 2)
・CH4 recovery from LNG boiled off gas
・CO2 recovery from industrial exhaust gas CO2/N2
Dehydration ・Dehydration from organic liquid
・Dehydration in the ester synthesis process
・Recycling of used organic liquid
・Dehydration in membrane reactor

1) CO2 separation from natural gas

High-purity CH4 (methane) and CO2 can be obtained while suppressing methane loss by separating and removing the CO2 contained as an impurity in natural gas, through use of a sub-nano ceramic membrane in a one-stage membrane system.

CO<sub>2</sub> separation from natural gas.

2) N2 separation from natural gas

N2 contained as an impurity in natural gas can be separated and removed using a sub-nano ceramic membrane. A two-stage membrane system makes it possible to obtain high-purity methane while suppressing methane loss.

N<sub>2</sub> separation from natural gas.

3) Biogas Purification

The biogas produced from biomass contains CH4 (methane) and CO2. Sub-nano ceramic membrane can also be used to separate and remove CO2 from biogas. A two-stage membrane system makes it possible to obtain high-purity methane and CO2.

Biogas Purification.

Separation properties of sub-nano ceramic membranes

Separation properties for a gas mixture using sub-nano ceramic membranes

Composition of gas mixture
Test conditions Performance
Pressure of feed gas
Temperature of feed gas
Composition of permeate gas
Separation coefficient
CO2 : CH4 = 50 : 50 0.3 25 CO2 > 99 >160
H2 : CH4 = 60 : 40 0.4 25 H2 > 99 >100
N2 : CH4 = 50 : 50 0.4 25 N2 > 96 >30

Dehydration performance from hydrous organic liquid using sub-nano ceramic membranes

Separation method Organic liquid Test conditions Dehydration performance
Organic liquid concentration of feed liquid
Temperature of feed liquid
Vacuum pressure at permeate side
Water permeation rate
Organic liquid concentration of permeate liquid
Alcohol Isopropanol 90 70 50 3 <1
n-Butanol 90 70 50 4.5 <1
Ketone Acetone 90 45 10 1 <2
Ether Tetrahydrofuran 90 50 10 4 <1
Ester Ethyl acetate 97 70 50 6 <1
Organic acid Acetic acid 30 90 200 9.5 <1
Vapor permeation
Alcohol Ethanol 90 105 10 6 <1

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NGK offers a wide range of ceramic filter products with different pore sizes.

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