US 11,883,774 B2 · Air filter for removing aldehyde-like VOCs from indoor air

Abstract

The present invention discloses an air filter cartridge for use in an air-purifying device for removing formaldehyde (methane, HCHO) and other aldehyde-like VOCs (Volatile Organic Compounds), and in certain embodiments amine-like VOCs, from indoor air. The air filter cartridge is made up of a casing containing a plurality of filament-like elements as a support and a mixture of one or more natural polyphenols and a catalyst integrated in said support as a powder, forming a sponge-like mesh. The air filter acts as an absorption filter, the sponge-like mesh reacting irreversibly with the aldehyde-like VOCs present in the air, generating a polymer in the form of a polyphenol-aldehyde resin inside the air filter. Due to this irreversible reaction, the air filter is capable of capturing formaldehyde, as well as other aldehyde-like VOCs that are less reactive than formaldehyde, amine-like VOCs and ammonia.

Claims15

Dependent claims

A filter cartridge for an air-purifying device for removing aldehyde from indoor air, said filter cartridge comprising a casing containing a plurality of filament-like elements as a support, with at least one natural polyphenol and a catalyst or catalytic agent integrated in said support, wherein said plurality of filament-like elements are of an organic or inorganic nature, and wherein the said filter cartridge is configured to act as an absorption filter and to reacting irreversibly with the aldehyde of the indoor air,

said at least one natural polyphenol is selected from the group consisting of:
resveratrol (3,4′,5-trihydroxystilbene), resorcinol (1,3-benzenediol), pyrogallol (1,2,3-benzenetriol), phloroglucinol (1,3,5-benzenetriol), and hydroquinone (1,4-benzenediol) or combinations thereof,
said catalyst or catalytic agent comprising a solid sulphonic acid,
said support further comprising a mixture of said at least one natural polyphenol and said catalyst or catalyst agent, and
said mixture provided as a finely divided powder, forming a sponge-like mesh.

2 more elements

A method for removing aldehyde, amine and ammonia from indoor air, the method comprising:

passing a controlled airflow of contaminated indoor air through an air filter comprising a plurality of filament-like elements as a support, with at least one natural polyphenol and a catalyst or catalytic agent integrated in the support,
the plurality of filament-like elements are of an organic or inorganic nature,
the aldehyde like VOCs configured to react with at least one natural polyphenol in the presence of the catalytic agent, generating a polymer in the form of a polyphenol-aldehyde resin, the air filter configured to retain the polymer in the form of a polyphenol-aldehyde resin, and
the air filter comprising a sponge like-mesh configured to capture the amine and ammonia, as well as imines and aminals arising from their reaction with aldehyde, due to the catalytic agent present in the air filter,
the at least one natural polyphenol is selected from the group consisting of:
resveratrol (3,4′,5-trihydroxystilbene), resorcinol (1,3-benzenediol), pyrogallol (1,2,3-benzene-triol), phloroglucinol (1,3,5-benzenetriol), and hydroquinone (1,4-benzenediol), or combinations thereof,
the catalyst or catalytic agent is a solid sulphonic acid, and
a mixture of the at least one natural polyphenol and the catalytic agent is provided in the support comprising the plurality of filament-like elements as a finely divided powder and is configured to form the sponge-like mesh.

5 more elements

Dependencies are inferred from the claim text.

Air filter for removing aldehyde-like VOCs from indoor air

Life of this patent

Air filter for removing aldehyde-like VOCs from indoor air

Life of this patent

Abstract

Claims15