Process for the treatment of a gas by temperature swing adsorption
AssigneeL'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
InventorsGeorges Kraus, Patrick Le Bot, Lian-Ming Sun
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Abstract
The regeneration phase of the adsorption cycle includes a depressurization step, a heating/elution step, during which the bed is purged with a hot heating/elution gas, and a cooling/elution step, during which the bed is purged with a cold cooling/elution gas. The cooling/elution step is terminated while the cooling/elution gas leaving the bed is at a temperature markedly higher than the temperature of the gas to be treated and the adsorption phase comprises an initial adsorption step during which the bed is cooled down to the low adsorption temperature due to the effect of the gas to be treated.
Claims8
Process for the treatment of a gas by Temperature Swing Adsorption (TSA) in at least two beds of adsorbent, in which each bed of adsorbent is subjected to a cycle which comprises, in succession:
- an adsorption phase, which itself comprises an adsorption step at a low adsorption temperature;
- an adsorbent regeneration phase, which itself comprises a depressurization step;
- a heating/elution step, during which the bed is purged with a hot heating/elution gas, and a cooling/elution step, during which the bed is purged with a cold cooling/elution gas;
- and a repressurization phase, in which:
- (a) the cooling/elution step is terminated while the cooling/elution gas leaving the bed is at a temperature of at least 30° C. greater than the temperature of the gas to be treated;
- (b) the adsorption phase comprises an initial adsorption step, during which the bed is cooled down to the low adsorption temperature due to the effect of the gas to be treated;
- (c) and wherein, during at least a first part of the initial adsorption step, the bed is connected up in parallel with another bed at the end of the adsorption phase, and the two gas streams coming from these two beds are combined.
A process for the treatment of a gas by Temperature Swing Adsorption (TSA) in at least two beds of adsorbent, wherein each bed of adsorbent is subjected to a cycle which comprises, in succession:
- an adsorption phase for producing a product gas, including an adsorption step at a low adsorption temperature;
- an adsorbent regeneration phase, including a depressurization step, a heating/elution step, during which the bed is purged with a hot heating/elution gas, and a cooling/elution step during which the bed is purged with a cold cooling/elution gas;
- and a repressurization phase,
- wherein:
- (a) the cooling/elution step is terminated while the cooling/elution gas leaving the bed is at a markedly higher temperature than the temperature of the gas to be treated;
- (b) the adsorption phase comprises an initial adsorption step during which the bed is cooled down to the low adsorption temperature as a result of the admission of the gas to be treated;
- and wherein
- (c) during at least a first part of said initial adsorption step, the bed is connected up in parallel with another bed at the end of the adsorption phase, and the two gas streams exiting from these two beds are combined in a common flow of product gas.
Dependencies are inferred from the claim text.