摘要:
Method for the separation of a gas mixture comprising providing a pressure swing adsorption system having a plurality of adsorber vessels, wherein each vessel has an inlet, an outlet, and a bed of particulate adsorbent material disposed therein. The adsorbent material is selective for the adsorption of one or more components from the gas mixture, and each bed of adsorbent material is characterized by a bed depth and by an average particle diameter less than about 1.3 mm. A feed step is carried out during a feed time period wherein the gas mixture is introduced into the adsorber vessel, one or more components are selectively adsorbed from the gas mixture, and a product gas is withdrawn from the adsorber vessel. The bed depth in feet times the dimensionless ratio of the empty bed residence time to the feed time period is less than about 4.
摘要:
Method for the separation of a gas mixture comprising providing a PSA system with at least one adsorber vessel containing adsorbent material that is selective for the adsorption of carbon monoxide and nitrogen, passing a feed gas mixture containing at least hydrogen and carbon monoxide and optionally containing nitrogen through the adsorbent material in a feed step and withdrawing a purified hydrogen product from the adsorber vessel, wherein the feed step has a duration or feed time period of about 30 seconds or less. The adsorbent material is characterized by any of (1) a Henry's law constant for carbon monoxide between about 2.5 and about 5.5 (mmole/g)/atm; (2) a carbon monoxide heat of adsorption between about 6.0 and about 7.5 kcal/gmole; (3) a Henry's law constant for nitrogen greater than about 1.5 (mmole/g)/atm; and (4) a selectivity of carbon monoxide to nitrogen between about 5.0 and about 8.0.
摘要:
A process and an apparatus for removal of radon from indoor air. The process having the step of contacting indoor air with an adsorbent, that is a silver-exchanged zeolite. The apparatus for the removal of radon from indoor air comprises a silver exchanged zeolite.
摘要:
A first aspect of a process of recovering xenon from feed gas includes: providing an adsorption vessel containing adsorbent having a Xe/N2 selectivity ratio 50% and an initial xenon concentration ≧0.5%; evacuating the adsorption vessel; and purging the adsorption vessel at a purge-to-feed ratio ≧10. The final xenon concentration is ≧15× the initial xenon concentration. A second aspect of the process includes providing an adsorption vessel containing adsorbent having a Xe Henry's law Constant ≧50 mmole/g/atm; feeding into the adsorption vessel feed gas having an initial nitrogen concentration >50% and an initial xenon concentration ≧0.5%; heating and purging the adsorption vessel to recover xenon having a final concentration ≧15× its initial concentration. Apparatus for performing the process are also described.
摘要:
An improved thermal swing adsorption process is set forth which addresses the problem of water ingress into the adsorbent by periodically heating the adsorbent to a temperature greater than the temperature used in the normal regeneration cycle.
摘要:
The invention provides vacuum swing adsorption processes that produce an essentially carbon monoxide-free hydrogen or helium gas stream from, respectively, a high-purity (e.g., pipeline grade) hydrogen or helium gas stream using one or two adsorber beds. By using physical adsorbents with high heats of nitrogen adsorption, intermediate heats of carbon monoxide adsorption, and low heats of hydrogen and helium adsorption, and by using vacuum purging and high feed stream pressures (e.g., pressures of as high as around 1,000 bar), pipeline grade hydrogen or helium can purified to produce essentially carbon monoxide -free hydrogen and helium, or carbon monoxide, nitrogen, and methane-free hydrogen and helium.
摘要:
Base treated aluminas exhibit improved CO2 capacity over untreated aluminas. Base treated aluminas prepared by physically mixing alumina and base during forming have (1) a higher surface area, (2) less hydrothermal aging, (3) improved CO2 capacity and (4) lower cost than base treated aluminas produced by aqueous impregnation. A method for removing at least CO2 and water from a gas stream includes providing an adsorbent formed from a process comprising physically mixing activated alumina solids and solid salts of alkali metals, alkaline earth metals or ammonium ion; and contacting the gas stream with the adsorbent.
摘要翻译:与未处理的氧化铝相比,碱处理的氧化铝具有改善的CO 2/2的能力。 在形成过程中通过物理混合氧化铝和碱而制备的基底处理的氧化铝具有(1)较高的表面积,(2)较少的水热老化,(3)改善了CO 2/2的能力和(4) 经浸渍处理生产的氧化铝。 从气流中除去至少CO 2 H 2和水的方法包括提供由包括物理混合活性氧化铝固体和碱金属,碱土金属或铵离子的固体盐的方法形成的吸附剂; 并使气流与吸附剂接触。