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

A method for reforming of hydrocarbons including recovery of products, the method comprising the steps of:

• separating a reforming-zone effluent that comprises H2, C4− hydrocarbons, and C5+ hydrocarbons including aromatics to form a net gas phase stream that comprises H2 and C6− hydrocarbons and a liquid phase hydrocarbon stream that comprises C5+ hydrocarbons including aromatics;
• separating 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;
• contacting the H2-rich stream with an adsorbent that selectively separates H2 from hydrocarbons to form an H2-ultra rich stream and a pressure swing adsorption (PSA) tail gas stream that comprises H2, C2− hydrocarbons, and some C3+ hydrocarbons;
• cooling the PSA tail gas stream to form a cooled PSA tail gas stream;
• cooling at least a portion of the liquid phase hydrocarbon stream to form a cooled liquid phase hydrocarbon stream;
• and
• contacting the cooled PSA tail gas stream with the cooled liquid phase hydrocarbon stream to extract C3/C4 hydrocarbons from the cooled PSA tail gas stream to the cooled liquid phase hydrocarbon stream and to form a H2, C2− hydrocarbons-containing gas stream and a cooled second intermediate liquid phase hydrocarbon stream that is enriched with C3/C4 hydrocarbons.

A method for reforming of hydrocarbons including recovery of products, the method comprising the steps of:

• combining a gas phase stream that comprises H2 and C6 hydrocarbons with a first portion of a liquid phase hydrocarbon stream that comprises C5+ hydrocarbons including aromatics to extract C3/C4 hydrocarbons from the gas phase stream to the first portion of the liquid phase hydrocarbon stream for forming an H2-rich stream that comprises primarily H2 and an intermediate liquid phase hydrocarbon stream that is enriched with C3/C4 hydrocarbons and further comprises C5+ hydrocarbons;
• contacting the H2-rich stream with an adsorbent that selectively separates H2 from hydrocarbons and that is contained in a pressure swing adsorption (PSA) zone to form an H2-ultra rich stream and a PSA tail gas stream that comprises H2, C2− hydrocarbons, and some C3+ hydrocarbons;
• cooling the PSA tail gas stream to form a cooled PSA tail gas stream;
• cooling a second portion of the liquid phase hydrocarbon stream to form a cooled liquid phase hydrocarbon stream;
• and
• contacting the cooled PSA tail gas stream with the cooled liquid phase hydrocarbon stream in an absorber to extract C3/C4 hydrocarbons from the cooled PSA tail gas stream to the cooled liquid phase hydrocarbon stream and to form a H2, C2− hydrocarbons-containing gas stream and a cooled second intermediate liquid phase hydrocarbon stream that is enriched with C3/C4 hydrocarbons.