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US 2023/0405550 A1Published application
Evaporative emission device and adsorbent
AssigneeBASF SE
InventorsWolfgang RUETTINGER, Steven CHIN, Laif R. ALDEN, Chen Chen, Akash ABRAHAM
Life of this patent
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Abstract
The present disclosure relates to hydrocarbon emission control systems. More specifically, the present disclosure relates to substrates coated with hydrocarbon adsorptive coating compositions, air intake systems, and evaporative emission control systems for controlling evaporative emissions of hydrocarbons from motor vehicle engines and fuel systems.
Claims11
An air intake system configured for controlling evaporative emissions from a motor vehicle with a combustion engine, said system comprising:
- an air intake duct, an air cleaner housing positioned to receive air from the air intake duct, and one or more clean air ducts in fluid communication with the air cleaner housing and the combustion engine for transporting air from an air filter chamber to the combustion engine;
- wherein at least a portion of an inner surface of at least one of said air intake duct, said air cleaner housing and said clean air ducts comprises a hydrocarbon adsorbent coating, or is in contact with a substrate coated with said hydrocarbon adsorbent coating, such that the hydrocarbon adsorbent coating is in fluid contact with a pathway for entry of combustion air into said combustion engine of said motor vehicle,
- wherein the hydrocarbon adsorbent coating comprises a particulate carbon and a binder that adheres particles of the particulate carbon to each other and to the substrate, wherein the binder comprises an organic polymer and is present in an amount from about 10% to about 50% by weight relative to the particulate carbon, wherein a thickness of the coating is less than or equal to 500 micrometers, and wherein the particulate carbon has a BET surface area of at least about 1400 m2/g, and
- wherein the particulate carbon exhibits a second cycle n-butane adsorption capacity of at least about 9% n-butane by weight when tested according to a protocol for which the particulate carbon is initially equilibrated at room temperature and exposed to a flow of 100 ml/min of 5% n-butane in nitrogen for 20 minutes, purged with a flow of 100 ml/min nitrogen for 25 minutes, and again exposed to a flow of 100 ml/min of 5% n-butane in nitrogen for 20 minutes.
1 more element
An evaporative emission control system comprising:
- a fuel tank for fuel storage;
- an internal combustion engine adapted to consume the fuel;
- and
- an evaporative emission control canister system, the canister system comprising:
- an evaporative emission control canister;
- and
- a bleed emission scrubber;
- the evaporative emission control canister comprising:
- a first adsorbent volume, a fuel vapor purge tube connecting the evaporative emission control canister to the engine, a fuel vapor inlet conduit for venting the fuel tank to the evaporative emission control canister, and a vent conduit for venting the evaporative emission control canister to the atmosphere and for admission of purge air to the evaporative emission control canister system,
- wherein the evaporative emission control canister system is defined by a fuel vapor flow path from the fuel vapor inlet conduit to the first adsorbent volume, toward the bleed emission scrubber and to the vent conduit, and by a reciprocal air flow path from the vent conduit to the bleed emission scrubber, toward the first adsorbent volume, and toward the fuel vapor purge tube,
- wherein the bleed emission scrubber comprises at least a second adsorbent volume, the second adsorbent volume comprising a coated substrate,
- wherein the coated substrate comprises a particulate carbon and a binder that adheres particles of the particulate carbon to each other and to the coated substrate, wherein the binder comprises an organic polymer and is present in an amount from about 10% to about 50% by weight relative to the particulate carbon, wherein a thickness of the coating is less than or equal to 500 micrometers, and wherein the particulate carbon has a BET surface area of at least about 1400 m2/g, and
- wherein the particulate carbon exhibits a second cycle n-butane adsorption capacity of at least about 9% n-butane by weight when tested according to a protocol for which the particulate carbon is initially equilibrated at room temperature and exposed to a flow of 100 ml/min of 5% n-butane in nitrogen for 20 minutes, purged with a flow of 100 ml/min nitrogen for 25 minutes, and again exposed to a flow of 100 ml/min of 5% n-butane in nitrogen for 20 minutes.
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Dependencies are inferred from the claim text.