Adsorption process by pressure variation with six beds operating in normal modes and with a lower capacity limit

摘要

A pressure swing adsorption process for the separation of a pressurized feed gas supply containing one or more strongly adsorbable components from at least one less strongly adsorbable product gas component in a six bed adsorbent system to produce a stream of product gas enriched in the less strongly adsorbable component and an exhaust gas stream that is enriched in strongly adsorbable components, wherein the duration of lower pressure equalization and first depressurization stage is less than 15% of the feed time, and the process cycle has eighteen stages that include four stages of equalization bed to bed according to the following cycle graph: ** Table ** where: A 1 = First adsorption stage A2 / PP1 = Second stage adsorption / first pressurization of product A3 / PP2 = Third adsorption stage / second pressurization of product 11 = Prime ra equalization downstream 12 = Second equalization downstream 13 = Third equalization downstream PGP = Provide purge gas 14 / S 1 = Fourth equalization downstream / first depressurization S2 = Second depressurization PG = Purge 14 ' = Equalization up ( using gas from stage 14) 13 ' = Equalization up (using gas from stage 13) 12' = Equalization up (using gas from stage 12) 11 ' = Equalization up (using gas from stage 11) PP1 = First pressurization of the product PP2 = Second pressurization of the product.