초록 ▼

Process for separating a gaseous mixture by adsorption includes the steps of: (a) a cocurrent isobaric production (fp1-fp2); (b) a pressure equalization between the adsorber undergoing decompression and another adsorber undergoing countercurrent recompression (fc1-N4); (c) a cocurrent partial emptyi

Process for separating a gaseous mixture by adsorption includes the steps of: (a) a cocurrent isobaric production (fp1-fp2); (b) a pressure equalization between the adsorber undergoing decompression and another adsorber undergoing countercurrent recompression (fc1-N4); (c) a cocurrent partial emptying to a reservoir (f); (d) a final countercurrent decompression (fa); (e) a countercurrent scavenging by the gas of the reservoir (fb); (f) a countercurrent partial recompression by at least one pressure equalization (f′e); (g) a countercurrent final recompression (f′di-F′d2); in which process the sum of the duration of the operations according to (c) and (d) is less than said phase shift and the sum of the durations of the operations according to (c), (d) and (e) is less than twice said phase shift; (h) at least two adsorbers are simultaneously in isobaric production, wherein: (i) the number of adsorbers is at least equal to four and less than 3+x+y, x and y being respectively the number of adsorbers in production and the number of pressure equalizations; (j) the emptying is introduced into the storage reservoir; (k) each pressure equalization is “direct”.

대표청구항 ▼

A process for separating a gas mixture by adsorption, comprising effecting on each of at least four adsorbers the same cycle of the following successive operations, the cycles being staggered from one adsorber to the following by a phase shift equal to the duration of a cycle divided by the number o

A process for separating a gas mixture by adsorption, comprising effecting on each of at least four adsorbers the same cycle of the following successive operations, the cycles being staggered from one adsorber to the following by a phase shift equal to the duration of a cycle divided by the number of said adsorbers, said cycle comprising the steps of: (a) an isobaric production operation at a high pressure of the cycle, termed a cocurrent operation; (b) a cocurrent decompression by at least one direct pressure equalization between said adsorber undergoing decompression and another adsorber undergoing countercurrent recompression; (c) a further cocurrent partial direct decompression into a single storage reservoir, said cocurrent partial decompression occupying a duration of time; (d) a final countercurrent decompression to a low pressure of the cycle; (e) a countercurrent scavenging at said low pressure with gas exclusively taken from the storage reservoir, said countercurrent scavenging occupying a duration of time which is longer than the duration of time occupied by the cocurrent decompression operation according to (c); (f) a partial direct countercurrent recompression by at least one pressure equalization of the type according to (b); (g) a final countercurrent recompression to the high pressure of the cycle by a flow of gas taken from the isobaric production flow; in which process: (h) the sum of the durations of the operations according to (c), (d) and (e) is less than said phase shift; (i) the total number of adsorbers is less than or equal to 1+x+y, x being the number of adsorbers simultaneously in isobaric production and y the number of direct pressure equalizations between two adsorbers, with x+y at least equal to three; (j) the gas entering into said single storage reservoir is exclusively used as scavenging gas in the scavenging step (e); (k) the gas coming from an adsorber in decompression and loading said storage reservoir is thereafter used in a later phase for scavenging the same adsorber; and (l) a filling of the storage reservoir (from its minimum pressure to its maximum pressure) with depressurizing gas according to step (c) is effected during a duration of time which does not overlap the duration of time during which an emptying of said storage reservoir (from its maximum pressure to its minimum pressure) from gas used exclusively for the scavenging according to step (e) is effected.