Patent ID: 8163809
Filing Date: 2012-04-24
Classification: B01D,C01B,F25J,F28F,Y02C,Y02P

Abstract:
1. A process for decreasing or eliminating unwanted hydrocarbon and oxygenate products caused by Fisher Tropsch Synthesis reactions in a gas stream having a carbon monoxide partial pressure of less than or equal to one bar and produced in a syngas treatment unit, said process comprising the steps of: A. providing a syngas treatment unit that comprises B. introducing a syngas stream containing hydrogen, carbon monoxide, methane and a variety of impurities into the impurities removal unit in order to remove a large portion of the impurities which present physical or safety issues downstream in the cold box from the syngas stream thereby producing an impurity lean syngas stream; C. withdrawing the impurity lean syngas stream from the impurities removal unit and introducing the impurity lean syngas stream into the front end purification unit during the adsorption step of the front end purification unit cycle in order to further remove impurities which present physical or safety issues downstream in the cold box from the impurity lean syngas stream by adsorbing the impurities on to the one or more adsorbents contained in the beds of the front end purification unit thereby producing a purified syngas stream; D. withdrawing the purified syngas stream from the front end purification unit and introducing the purified syngas stream into the cold box wherein the carbon monoxide in the purified syngas stream is condensed at a temperature from about −180° C. to about −250° C. to form a pure carbon monoxide stream and the remaining components of the purified syngas stream form a carbon monoxide lean gas stream; E. removing the pure carbon monoxide stream from the cold box as carbon monoxide product; and F. withdrawing the carbon monoxide lean gas stream from the cold box and either: