Method of pressure swing adsorption with regulation

A pressure swing adsorption (PSA) process for producing a gas stream enriched in a compound X from a feed gas stream, the process comprising at least 2 adsorbers, each adsorber being subjected to a pressure cycle having a high pressure and a low pressure and comprising the following successive steps:

• a) adsorption at the high pressure with production of the gas stream enriched in compound X,
• b) depressurization to the low pressure with production of at least one portion of an elution gas,
• c) elution at the low pressure by means of the elution gas,
• d) repressurization to the high pressure,
• wherein the pressure cycle has a phase time corresponding to the duration of a pressure cycle divided by the number of adsorbers and the pressure of the pressure cycle, located between the high pressure and the low pressure, is modified so as to keep, during at least one portion of the range of variation of the operating conditions, the phase time of the PSA equal to or within ±5% of the nominal phase time, corresponding to the phase time of the PSA under the design conditions.