US 12,215,922 B2
Integrated heavy hydrocarbon and BTEX removal in LNG liquefaction for lean gases
John Mak, Santa Ana, CA (US); Jacob Thomas, Sugar Land, TX (US); Dhirav Patel, Sugar Land, TX (US); Curt Graham, Mission Viejo, CA (US); and Irene Zhang, Sugar Land, TX (US)
Assigned to Fluor Technologies Corporation, Sugar Land, TX (US)
Filed by Fluor Technologies Corporation, Sugar Land, TX (US)
Filed on May 23, 2019, as Appl. No. 16/421,138.
Prior Publication US 2020/0370824 A1, Nov. 26, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. F25J 3/00 (2006.01); F25J 3/02 (2006.01)
CPC F25J 3/0209 (2013.01) [F25J 3/0242 (2013.01); F25J 2205/04 (2013.01); F25J 2205/50 (2013.01); F25J 2210/06 (2013.01); F25J 2210/60 (2013.01); F25J 2220/64 (2013.01)] 36 Claims
OG exemplary drawing
 
1. A method for removing heavy hydrocarbons from a feed gas, the method comprising:
cooling an inlet gas in a propane pre-cooling heat exchanger;
separating the cooled inlet gas to produce the feed gas and a feed liquid;
feeding, into an absorber, the feed gas, a top reflux stream, and a second reflux stream below the top reflux stream, wherein the absorber produces an absorber bottom product stream and an absorber overhead product stream;
depressurizing and feeding the absorber bottom product stream to a stripper to produce a stripper bottom product stream and a stripper overhead product stream;
cooling and feeding a portion of the absorber overhead product stream back to the absorber as the top reflux stream; and
pressurizing and feeding the stripper overhead product stream back to the absorber as the second reflux stream.