# US 2021/0172402 A1 · Evaporative fuel vapor emission control systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0172402 A1 - Document ID: US20210172402A1 - Status: Published application - Kind: A1 - Application number: 17/178,449 - Filed: 2021-02-18 - Published: 2021-06-10 - Earliest claimed: 2017-06-19 - Assignees: Ingevity South Carolina, LLC - Applicants: Ingevity South Carolina, LLC - Inventors: Timothy M. Byrne; Laurence H. Hiltzik; Marta Leon Garcia; Cameron I. Thomson - Web page: https://patentgrep.com/patent/US20210172402A1 ## CPC - F02M 25/0854: {Details of the absorption canister} - B01D 53/02: by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)} - B01D 53/0407: {Constructional details of adsorbing systems} - B01D 53/0415: {Beds in cartridges} - B01D 53/0438: {Cooling or heating systems} - B01D 2253/102: Carbon - B01D 2253/104: Alumina - B01D 2253/106: Silica or silicates - B01D 2253/108: Zeolites - B01D 2253/11: Clays - B01D 2253/1124: Metal oxides - B01D 2253/308: Pore size - B01D 2253/311: Porosity, e.g. pore volume - B01D 2253/34: Specific shapes - B01D 2253/3425: Honeycomb shape - B01D 2257/7022: Aliphatic hydrocarbons - B01D 2257/708: Volatile organic compounds V.O.C.'s - B01D 2259/40086: by using a purge gas (B01D2259/4009 takes precedence) - B01D 2259/41: using plural beds of the same adsorbent in series - B01D 2259/4145: arranged in series - B01D 2259/4516: for fuel vapour recovery systems - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) ## Abstract The present disclosure describes an evaporative emission control canister system that includes: one or more canisters comprising at least one vent-side particulate adsorbent volume comprising a particulate adsorbent having microscopic pores with a diameter of less than about 100 nm; macroscopic pores having a diameter of about 100-100,000 nm; and a ratio of a volume of the macroscopic pores to a volume of the microscopic pores that is greater than about 150%, and having a retentivity of about 1.0 g/dL or less. The system may further include a high butane working capacity adsorbent. The disclosure also describes a method for reducing emissions in an evaporative emission control system. ## Claims ### Claim 1 An adsorbent material comprising: a particulate activated carbon material having microscopic pores with a diameter of less than about 100 nm, macroscopic pores having a diameter of about 100-100,000 nm, and a ratio of the volume of the macroscopic pores to the volume of the microscopic pores that is greater than about 160%, wherein the particulate activated carbon material has at least one of (i) a nominal butane working capacity (BWC) of <8 g/dL, (ii) a butane retentivity of less than about 1 g/dL or (iii) a combination of (i) and (ii). ### Claim 2 (depends on 1) The adsorbent material of claim 1, wherein the adsorbent has a butane retentivity of 1.0 g/dL or less. ### Claim 3 (depends on 1) The adsorbent material of claim 1, wherein the adsorbent has a butane retentivity of about 0.25 to 1.0 g/dL. ### Claim 4 (depends on 1) The adsorbent material of claim 1, wherein the adsorbent further includes at least one of porous polymers, porous alumina, clay, porous silica, kaolin, zeolites, metal organic frameworks, titania, ceria, or a combination thereof. ### Claim 5 (depends on 1) The adsorbent material of claim 1, wherein the adsorbent has a micropore volume as determined by BJH of about 0.5 cc/g or less. ### Claim 6 (depends on 1) The adsorbent material of claim 1, wherein the adsorbent comprises a body defining an exterior surface and a hollow shape or morphology. ### Claim 7 (depends on 6) The adsorbent material of claim 6, wherein the morphology is at least one of substantially a cylinder, substantially an oval prism, substantially a sphere, substantially a cube, substantially an elliptical prism, substantially a rectangular prism, a trilobe prism, a three-dimensional spiral, or a combination thereof. ### Claim 8 (depends on 1) The adsorbent material of claim 1, wherein the particulate activated carbon material has a cross-sectional width of about 1 mm to about 20 mm. ### Claim 9 (depends on 1) The adsorbent material of claim 1, wherein the adsorbent has a hollow shape in cross-section. ### Claim 10 (depends on 1) The adsorbent material of claim 1, wherein the adsorbent includes at least one cavity in fluid communication with an exterior surface of the adsorbent. ### Claim 11 (depends on 10) The adsorbent material of claim 10, wherein the exterior surface of the adsorbent has a thickness of about 0.1 mm to about 3.0 mm. ### Claim 12 (depends on 9) The adsorbent material of claim 9, wherein at least one of: at least one exterior wall of the hollow shape has a thickness in a range of about 0.1 mm to about 1.0 mm; the hollow shape has at least one interior wall extending between the at least one exterior wall and having a thickness in a range of about 0.1 mm to about 1.0 mm; or a combination thereof. ### Claim 13 (depends on 12) The adsorbent material of claim 12, wherein the thickness of the at least one of the interior wall, the at least one exterior wall or a combination thereof is about 0.3 mm to about 0.8 mm. ### Claim 14 (depends on 13) The adsorbent material of claim 13, wherein the thickness of the at least one of the interior wall, the at least one exterior wall or a combination thereof is about 0.4 mm to about 0.7 mm. ### Claim 15 (depends on 13) The adsorbent material of claim 13, wherein the at least one interior wall extends outward to the at least one exterior wall in at least two directions from a hollow portion of the particulate adsorbent material. ### Claim 16 (depends on 13) The adsorbent material of claim 13, wherein the at least one interior wall extends outward to the at least one exterior wall in at least three directions from a hollow portion of the particulate adsorbent material. ### Claim 17 (depends on 13) The adsorbent material of claim 13, wherein the at least one interior wall extends outward to the at least one exterior wall in at least four directions from a hollow portion of the particulate adsorbent material. ### Claim 18 (depends on 1) The adsorbent material of claim 1, wherein the adsorbent has a length of about 1 mm to about 20 mm. ### Claim 19 (depends on 1) The adsorbent material of claim 1, wherein the activated carbon is derived from at least one material selected from the group consisting of wood, wood dust, wood flour, cotton linters, peat, coal, coconut, lignite, carbohydrates, petroleum pitch, petroleum coke, coal tar pitch, fruit pits, fruit stones, nut shells, nut pits, sawdust, palm, vegetables, synthetic polymer, natural polymer, lignocellulosic material, and combinations thereof. ### Claim 20 (depends on 4) The adsorbent material of claim 4, wherein the clay is at least one of Zeolite clay, Bentonite clay, Montmorillonite clay, Illite clay, French Green clay, Pascalite clay, Redmond clay, Terramin clay, Living clay, Fuller's Earth clay, Ormalite clay, Vitallite clay, Rectorite clay, or a combination thereof. ### Claim 21 (depends on 1) The adsorbent material of claim 1, further comprises at least one of: a pore forming material or processing aid that decomposes, solubilizes, sublimates, vaporizes, or melts when heated to a temperature of 100° C. or more; a binder; a filler; or a combination thereof. ### Claim 22 (depends on 21) The adsorbent material of claim 21, wherein the pore forming material or processing aid is a cellulose derivative. ### Claim 23 (depends on 21) The adsorbent material of claim 21, wherein the pore forming material or processing aid is methylcellulose. ### Claim 24 (depends on 21) The adsorbent material of claim 21, wherein the pore forming material or processing aid sublimates, vaporizes, chemically decomposes, solubilizes or melts when heated to a temperature in a range of about 125° C. to about 640° C. ### Claim 25 (depends on 21) The adsorbent material of claim 21, wherein the binder is clay or a silicate material. ### Claim 26 (depends on 25) The adsorbent material of claim 25, wherein the clay is at least one of Zeolite clay, Bentonite clay, Montmorillonite clay, Illite clay, French Green clay, Pascalite clay, Redmond clay, Terramin clay, Living clay, Fuller's Earth clay, Ormalite clay, Vitallite clay, Rectorite clay, or a combination thereof.