Process for the separation of gaseous mixtures by adsorption with pressure variation
First Claim
1. A method for the separation of a gaseous mixture by adsorption under pressure variation between a cycle high pressure and a cycle low pressure in an adsorption unit including at least one adsorber containing at least one adsorbent and having an inlet and an outlet, using a repetitive cycle consisting of the following sequential successive stages:
- stage I, repressurization from the low pressure of the cycle,stages II and III, during one of which the high pressure of the cycle is reached,stage IV, during which the low pressure of the cycle is reached, and including at least a sub-stage of depressurization and a subsequent sub-stage of purge/elutionwherein each stage (I to IV) involves a fixed gas flow at one end of the adsorber and a free gas flow at the other end of the adsorber, the fixed flows addressing, in alternation, the inlet and outlet of the adsorber from one stage (I to IV) to the next.
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Abstract
A separation process, involving an adsorber containing at least one adsorbent with an inlet and outflow, involves the following stages of the cycle:--stage I, repressurization from the low pressure of the cycle;--stages II and III during one of which the high pressure of the cycle is reached; and stage IV, depressurization/purging, during which the low pressure of the cycle is reached. Each stage (I to IV) involves a fixed gas flow (F) at one end of the adsorber and a free gas flow (λ) at the other end of the adsorber, the fixed flows (F) addressing the inlet (E) and outlet (F) ends of the adsorber from one stage (I to IV) to the next. The process is particularly applicable to the production of oxygen from air.
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Citations
21 Claims
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1. A method for the separation of a gaseous mixture by adsorption under pressure variation between a cycle high pressure and a cycle low pressure in an adsorption unit including at least one adsorber containing at least one adsorbent and having an inlet and an outlet, using a repetitive cycle consisting of the following sequential successive stages:
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stage I, repressurization from the low pressure of the cycle, stages II and III, during one of which the high pressure of the cycle is reached, stage IV, during which the low pressure of the cycle is reached, and including at least a sub-stage of depressurization and a subsequent sub-stage of purge/elution wherein each stage (I to IV) involves a fixed gas flow at one end of the adsorber and a free gas flow at the other end of the adsorber, the fixed flows addressing, in alternation, the inlet and outlet of the adsorber from one stage (I to IV) to the next. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for the separation of a gaseous mixture by adsorption under pressure variation in an adsorption apparatus including at least one adsorber containing at least one adsorbent and having an inlet and an outlet, using a repetitive cycle consisting of the following sequential successive stages:
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stage I, repressurization from a low pressure of the cycle, stages II and III, during one of which a high pressure of the cycle is reached, stage IV, depressurization/purging, during which the low pressure of the cycle is reached, wherein each stage (I to IV) involves a fixed gas flow at one end of the adsorber and a free gas flow at the other end of the adsorber, the fixed flows addressing, in alternation, the inlet and outlet of the adsorber from one stage to the next, each stage divided into at least two sub-stages for the free flow, which is, for each sub-stage, selected from the flow group consisting of in, out and practically nil flows. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification