Methods and apparatuses for selective hydrogenation of olefins

A method for selective hydrogenation of olefins comprising:

• reacting a naphtha boiling range stream comprising olefins and aromatics wherein the olefins comprise about 0.05 weight percent to about 10 weight percent with hydrogen in a selective hydrogenation zone having a reactor where the reactor contains a catalyst producing a selective hydrogenation zone product stream comprising aromatic compounds;
• passing the selective hydrogenation zone product stream to a flash vessel wherein the flash vessel comprises four or more vapor-liquid contacting trays or equivalent packing and the flash vessel operates at a temperature from about 70° C. (158° F.) to about 180° C. (356° F.), a pressure from about 200 kPa (29 psig) to about 1100 kPa (160 psig);
• recovering a first product stream and a second product stream from the flash vessel;
• passing the first product stream to a liquid jet eductor;
• and
• recovering the second product stream comprising aromatic compounds having a reduced concentration of olefins.