Methods and apparatuses for reforming of hydrocarbons including recovery of products using a recovery zone and a pressure swing adsorption zone

摘要

Embodiments of apparatuses and methods for reforming of hydrocarbons including recovery of products are provided. In one example, a method comprises separating a reforming-zone effluent to form a net gas phase stream and a liquid phase hydrocarbon stream. The net gas phase stream is separated for forming an H2-rich stream and a first intermediate liquid phase hydrocarbon stream. The H2-rich stream is contacted with an adsorbent to form an H2-ultra rich stream and a pressure swing adsorption (PSA) tail gas stream. The PSA tail gas stream and at least a portion of the liquid phase hydrocarbon stream are combined and cooled to form a cooled two-phase combined stream. The cooled two-phase combined stream is separated into a H2, C2−hydrocarbons-containing gas stream and a cooled second intermediate liquid phase hydrocarbon stream.

主权项

1. An apparatus for reforming of hydrocarbons including recovery of products, the apparatus comprising:
a separation zone configured to receive and separate a reforming-zone effluent that comprises H2, C4−hydrocarbons, and C5+hydrocarbons including aromatics to form a net gas phase stream that comprises H2and C6−hydrocarbons and a liquid phase hydrocarbon stream that comprises C5+hydrocarbons including aromatics; a first recovery zone configured to receive and separate the net gas phase stream for forming an H2-rich stream and a first intermediate liquid phase hydrocarbon stream that is enriched with C3/C4 hydrocarbons and further comprises C5+hydrocarbons; a pressure swing adsorption (PSA) zone containing an adsorbent for selectively separating H2from hydrocarbons, wherein the PSA zone is configured for receiving the H2-rich stream and for contacting the H2-rich stream with the adsorbent to form an H2-ultra rich stream and a PSA tail gas stream that comprises H2, C2−hydrocarbons, and some C3+hydrocarbons; and a second recontacting zone configured to receive, combine, and cool the PSA tail gas stream and at least a portion of the liquid phase hydrocarbon stream to extract C3/C4hydrocarbons from the PSA tail gas stream to the at least the portion of the liquid phase hydrocarbon stream for forming a H2, C2−hydrocarbons-containing gas stream and a cooled second intermediate liquid phase hydrocarbon stream that is enriched with C3/C4hydrocarbons.