Separation membrane structure and nitrogen concentration reduction method
AssigneeNGK Insulators, Ltd.
InventorKenichi NODA
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Abstract
A separation membrane structure comprises a porous support body, a zeolite membrane formed on the porous support body and comprising pores having a major diameter and a minor diameter. The ratio of a major diameter to a minor diameter is greater than 1.0. The minor diameter is greater than or equal to 0.30 nm and less than or equal to 0.35 nm.
Claims7
A separation membrane structure configured for selective permeation of nitrogen from a mixed gas that contains at least methane and nitrogen, the separation membrane structure comprising:
- a porous support body, and
- a zeolite membrane formed on the porous support body, and comprising pores having a major diameter and a minor diameter,
- a ratio of the major diameter to the minor diameter is greater than 1.0, and
- the minor diameter is greater than or equal to 0.30 nm and less than or equal to 0.35 nm.
A separation membrane structure configured for selective permeation of nitrogen from a mixed gas that contains at least methane and nitrogen, the separation membrane structure comprising:
- a porous support body, and
- a zeolite membrane formed on the porous support body, and comprising plural types of pores respectively having a major diameter and a minor diameter,
- a ratio of the major diameter to the minor diameter is greater than 1.0 in a pore that has the greatest minor diameter of the plural types of pores, and
- the minor diameter is greater than or equal to 0.30 nm and less than or equal to 0.35 nm in a pore that has the greatest minor diameter of the plural types of pores.
Dependencies are inferred from the claim text.