Carbon membrane and method for pervaporation separation
AssigneeNGK Insulators, Ltd.
InventorsAkimasa Ichikawa, Kenji Suzuki, Naoto Kinoshita, Yoshinori Isoda, Takafumi Kimata
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Abstract
A carbon membrane formed by carbonizing a phenol resin having at least one kind of atomic groups among a methylene bond, a dimethylene ether bond, and a methylol group, wherein the total mole content of the atomic groups is 100 to 180% with respect to the phenolic nuclei. A pervaporation separation method using the carbon membrane is also disclosed.
Claims15
A carbon membrane formed by subjecting a precursor solution of a phenol resin having at least one kind of atomic groups selected from a group consisting of a methylene bond, a dimethylene ether bond, and a methylol group to a thermal treatment at 200 to 350° C. under atmosphere and carbonizing the resulting phenol resin,
- wherein a total mole content rate of the atomic groups is 100 to 180% with respect to a phenolic nuclei,
- wherein the thickness of the carbon membrane is 0.01 to 10 μm,
- wherein the carbon membrane has a ratio of separation coefficient (α) after exposure to an acidic condition to initial separation coefficient (αin) of at least about 0.90 and
- wherein the acidic condition consists of at least one of immersion in a 10% sulfuric acid aqueous solution at 80° C. for 40 hours, immersion in a 10% hydrochloric acid aqueous solution at 80° C. for 40 hours, and immersion in a 70% acetic acid aqueous solution at 80° C. for 40 hours.
Dependencies are inferred from the claim text.