Evaporative emission treatment device
Disclosed herein an evaporative emission treatment device comprising: a housing; and an adsorption member disposed in the housing, the adsorption member comprising an adsorption component comprising an activated carbon textile made from a novoloid precursor.
1. An evaporative emission treatment device comprising:
a housing; and
an adsorption member disposed in the housing, the adsorption member comprising an adsorption layer comprising an activated carbon textile made from a novoloid precursor and a porous layer adjacent the adsorption layer, said adsorption member being cylindrical and having a cross-section such that the adsorption layer and the porous layer are arranged in a helical geometry.
2. The evaporative emission treatment device of claim 1 , wherein the adsorption layer and the porous layer form alternating layers along a diameter of the cross-section.
3. The evaporative emission treatment device of claim 2 , wherein the adsorption layer forms an outer layer of the adsorption member proximate to the housing.
4. The evaporative emission treatment device of claim 2 , wherein the porous layer forms an outer layer of the adsorption member proximate to the housing.
5. The evaporative emissions treatment device of claim 2 , wherein the porous layer comprises a reticulated polyurethane foam.
6. The evaporative emissions treatment device of claim 2 , wherein the adsorption layer comprises a thickness of less than or equal to about 4 mm.
7. The evaporative emissions treatment device of claim 2 , wherein the porous layer comprises a thickness of less than or equal to about 5 mm.
8. An evaporative emission treatment device, comprising:
a housing disposed around an adsorption member comprising an adsorption layer comprising an activated carbon textile having a specific surface area (as measured by the BET method) of greater than or equal to about 1,000 m 2 /g and a tensile strength of greater than or equal to about 20 kg/mm 2 , said adsorption member further comprising a porous layer adjacent the adsorption layer, said adsorption member being cylindrical and having a cross-section such that the adsorption layer and the porous layer are arranged in a helical geometry.
9. The evaporative emission treatment device of claim 8 , wherein the adsorption member has a pressure drop across the adsorption member of less than or equal to about 1.5 kPa at a flow rate of 60 SLPM and a hydrocarbon emission of less than or equal to about 10 mg during a 24-hour period.
10. The evaporative emission treatment device of claim 8 , wherein the adsorption member comprises alternating layers of the adsorption component and a porous component along a diameter of the cross-section.
11. The evaporative emission treatment device of claim 8 , wherein the adsorption layer forms an outer layer of the adsorption member proximate to the housing.
12. The evaporative emission treatment device of claim 8 , wherein the porous layer forms an outer layer of the adsorption member proximate to the housing.
13. The evaporative emissions treatment device of claim 8 , wherein the porous layer comprises a reticulated polyurethane foam.
14. The evaporative emissions treatment device of claim 8 , wherein the adsorption layer comprises a thickness of less than or equal to about 4 mm.
15. The evaporative emissions treatment device of claim 8 , wherein the porous layer comprises a thickness of less than or equal to about 5 mm.
16. A method of making an evaporative emission treatment device, the method comprising:
forming an adsorption layer comprising an activated carbon textile made from a novoloid precursor;
disposing a porous layer adjacent the adsorption layer;
rolling the adsorption layer and the porous layer to form a cylindrical adsorption member having a cross-section such that the adsorption layer and the porous layer are arranged in a helical geometry; and
disposing the adsorption member in a housing.