Ammonia separation method and zeolite
AssigneeMitsubishi Chemical Corporation
InventorsManabu Tanaka, Takeshi Matsuo, Takayuki Aoshima
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Abstract
Provided is a method for separating ammonia gas using zeolite membrane having excellent separation stability at a high temperature capable of separating ammonia gas from a mixed gas composed of multiple components including ammonia gas, hydrogen gas, and nitrogen gas to the permeation side with high selectivity and high permeability. Also provided is a method for separating ammonia by selectively permeating ammonia gas from a mixed gas containing at least ammonia gas, hydrogen gas, and nitrogen gas using a zeolite membrane, wherein the ammonia gas concentration in the mixed gas is 1.0% by volume or more.
Claims6
A zeolite membrane comprising a zeolite, wherein the zeolite has a molar ratio of N element to Al element ranging from 0.01 to 4, as determined by X-ray photoelectron spectroscopy.
A zeolite membrane composite, comprising:
- a porous support;
- and
- a zeolite membrane comprising a zeolite,
- wherein the zeolite membrane is deposited on a surface of the porous support, and
- wherein a change rate of a thermal expansion coefficient at 300° C. with respect to a thermal expansion coefficient at 30° C. of the zeolite is equal to or within ±0.25% and a change rate of a thermal expansion coefficient at 400° C. with respect to the thermal expansion coefficient at 30° C. of the zeolite is equal to or within ±0.35%.
Dependencies are inferred from the claim text.