US 12,331,258 B2
Carbon dioxide conversion process and system therefor
Chundong Zhang, Daejeon (KR); Ki Won Jun, Daejeon (KR); and Seok Ki Kim, Daejeon (KR)
Assigned to KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGY, Daejeon (KR)
Appl. No. 17/427,509
Filed by KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGY, Daejeon (KR)
PCT Filed Jan. 28, 2020, PCT No. PCT/KR2020/001275
§ 371(c)(1), (2) Date Jul. 30, 2021,
PCT Pub. No. WO2020/159188, PCT Pub. Date Aug. 6, 2020.
Claims priority of application No. 10-2019-0013064 (KR), filed on Jan. 31, 2019; and application No. 10-2019-0122009 (KR), filed on Oct. 2, 2019.
Prior Publication US 2022/0127538 A1, Apr. 28, 2022
Int. Cl. C10L 3/08 (2006.01); B01D 3/06 (2006.01); B01D 3/42 (2006.01); B01D 5/00 (2006.01); C10G 2/00 (2006.01); C10K 3/02 (2006.01); C10L 3/10 (2006.01)
CPC C10L 3/08 (2013.01) [B01D 3/06 (2013.01); B01D 3/42 (2013.01); B01D 5/006 (2013.01); C10G 2/32 (2013.01); C10K 3/026 (2013.01); C10L 3/104 (2013.01); C10L 2290/42 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A carbon dioxide conversion system, comprising:
a reverse water gas shift (RWGS) reaction part configured to introduce carbon dioxide and hydrogen to perform an RWGS reaction;
a first reaction part configured to receive an effluent from the RWGS reaction to perform a Fischer-Tropsch synthesis (FTS) reaction to produce hydrocarbons;
a separation part configured to receive the effluent of the first reaction part to separate C5+ hydrocarbons with a carbon number of equal to or greater than five from a mixture of lower hydrocarbons with a carbon number of one to four and unconverted reactants;
a recycle part excluding a venting part configured to receive the lower hydrocarbons and unconverted reactants separated in the separation part to resupply a part thereof to the RWGS part and supply a remainder thereof to a second reaction part excluding the venting part to produce a synthetic natural gas to prevent lower hydrocarbons from accumulating in the carbon dioxide conversion system; and
the second reaction part configured to produce a synthetic natural gas with an appropriate calorific value without a separate calorific value control process part, by adding hydrogen to a feed supplied from the recycle part, wherein the appropriate calorific value is 9,700˜10,800 kcal/Nm3.