VERFAHREN ZUR REINIGUNG EINES MIT KOHLENWASSERSTOFFDAEMPFEN BELADENEN ROHGAS- ODER ABGASSTROMES UNTER RUECKGEWINNUNG DER KOHLENWASSERSTOFFE

摘要

The invention relates to a process for cleaning a stream of crude gas and/or waste gas charged with hydrocarbon vapors resulting in recovery of the hydrocarbons. The process consists of adsorption, desorption, and condensation and/or absorption, and the adsorption is accomplished in two two-stage adsorber systems connected to each other in parallel. A charged stream of gas is first directed to the first adsorber system for coarse cleaning by a primary adsorber (2) and then for precision cleaning to a secondary adsorber (4) connected in series to the first adsorber. The hydrocarbons adsorbed in the primary adsorber (2) are desorbed by use of a vacuum pump (26) and the hydrocarbon vapors depleted of inert gas that are obtained are recovered in the condensation and/or absorption system (24) after compression in the vacuum pump (26) and the hydrocarbon components that are not condensed or absorbed are returned to the stream of crude gas. The hydrocarbons adsorbed in the secondary adsorber (4) are desorbed and are returned to the stream of crude gas after compression in the vacuum pump (27). As soon as the saturation values for the adsorbents in the first adsorber system have been reached, the process is switched to the second adsorber system that has been regenerated and desorbed in the interim and the first adsorber system simultaneously undergoes regeneration and desorption.