Adsorbent bed with increased hydrothermal stability
AssigneeBASF SE
InventorsWilliam B. Dolan, Justin Pan, Alfonse Maglio, Margaret Anne Greene, Tobias Eckardt
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Abstract
Disclosed in certain embodiments are methods of removing water from a gas feed stream comprising hydrocarbons and water during an adsorption step of an adsorption cycle.
Claims18
A thermal swing adsorption method to perform hydrocarbon removal and water removal in a single adsorbent bed, the method comprising:
- directing a gas feed stream having an initial water mole fraction toward the adsorbent bed, the adsorbent bed comprising:
- a first adsorbent layer to remove C6+ hydrocarbons and water from the gas feed stream, wherein a weight percent (wt. %) of the first adsorbent layer with respect to the total weight of the adsorbent bed is greater than 50 wt. %, and wherein the first adsorbent layer is preferentially selective for C6+ hydrocarbons;
- and
- a second adsorbent layer downstream from the first adsorbent layer to remove remaining water from the gas feed stream, the second adsorbent layer comprising a zeolite,
- wherein a cycle time of the thermal swing adsorption method is less than or equal to about 8 hours, and
- wherein, after passing through the first adsorbent layer, the gas feed stream has a reduced water mole fraction that is less than or equal to 20% of the initial water mole fraction when the gas feed stream reaches the second adsorbent layer.
A thermal swing adsorption method to perform hydrocarbon removal and water removal in a single adsorbent bed during an adsorption step of an adsorption cycle, the method comprising:
- directing a gas feed stream having an initial water mole fraction toward the adsorbent bed, the adsorbent bed comprising a first layer comprising one or more of amorphous silica, amorphous silica-alumina, or high-silica zeolite, and a second layer comprising zeolite, wherein a weight percent (wt. %) of the first layer with respect to the total weight of the adsorbent bed is greater than 50 wt. %, wherein the material of the first layer is preferentially selective for C6+ hydrocarbons, and wherein:
- after passing through the first layer, the gas feed stream has a reduced water mole fraction that is less than or equal to 10% of the initial water mole fraction when the gas feed stream reaches the second layer,
- a regeneration gas of the thermal swing adsorption method is a product gas of the thermal swing adsorption method or an external clean dry gas,
- a time of an adsorption step is less than 6, 4, 2, or 1 hours,
- the gas feed stream after leaving the adsorbent bed contains less than 1 ppm or less than 0.1 ppm water, and
- the gas feed stream after leaving the adsorbent bed has a reduced hydrocarbon mole fraction.
A method of removing water from a gas feed stream comprising hydrocarbons and water during an adsorption step of an adsorption cycle, the method comprising:
- directing the gas feed stream having an initial water mole fraction toward an adsorbent bed, the adsorbent bed comprising:
- a first adsorbent layer comprising an adsorbent that is preferentially selective for C6+ hydrocarbons and comprises one or more of an amorphous silica adsorbent, an amorphous silica-alumina adsorbent, or a high-silica zeolite adsorbent;
- and
- a second adsorbent layer downstream from the first adsorbent layer to remove remaining water, the second adsorbent layer comprising a zeolite,
- wherein, after passing through the first adsorbent layer, the gas feed stream has a reduced water mole fraction that is less than or equal to 10% of the initial water mole fraction when the gas feed stream reaches the second adsorbent layer, and wherein a cycle time of the adsorption cycle is less than or equal to about 8 hours.
Dependencies are inferred from the claim text.