US 11,655,169 B2
Method of treating spent caustic and apparatus thereof
Sung Ho Lee, Incheon (KR); Sang Ho Lee, Incheon (KR); Min Hee Lee, Incheon (KR); and Ji Hoon Yoo, Seoul (KR)
Assigned to SK Incheon Petrochem Co., Ltd., Incheon (KR); and SBE&E Co., Ltd., Incheon (KR)
Filed by SK Incheon Petrochem Co., Ltd., Incheon (KR); and SBE&E Co., Ltd., Incheon (KR)
Filed on Oct. 25, 2017, as Appl. No. 15/793,136.
Claims priority of application No. 10-2016-0138865 (KR), filed on Oct. 25, 2016.
Prior Publication US 2018/0111859 A1, Apr. 26, 2018
Int. Cl. C02F 1/72 (2023.01); B01J 35/00 (2006.01); B01J 35/02 (2006.01); B01J 37/03 (2006.01); B01D 53/78 (2006.01); B01J 21/06 (2006.01); C02F 9/00 (2023.01); C02F 1/32 (2023.01); C02F 1/78 (2023.01); C02F 101/10 (2006.01); C02F 103/36 (2006.01)
CPC C02F 1/722 (2013.01) [B01D 53/78 (2013.01); B01J 21/063 (2013.01); B01J 35/002 (2013.01); B01J 35/004 (2013.01); B01J 35/0013 (2013.01); B01J 35/023 (2013.01); B01J 37/036 (2013.01); C02F 1/725 (2013.01); C02F 9/00 (2013.01); B01J 2219/00018 (2013.01); C02F 1/32 (2013.01); C02F 1/78 (2013.01); C02F 2101/101 (2013.01); C02F 2103/365 (2013.01); C02F 2305/02 (2013.01); C02F 2305/023 (2013.01); C02F 2305/10 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method of treating spent caustic comprising:
supplying an oxidizing agent from an oxidizing agent supplier to a reactor while supplying spent caustic to the reactor from a spent caustic supplier spaced apart from and positioned below a gas and liquid separator, wherein said spent caustic flows from, is generated by, and/or originates from a hydrocarbon stream desulfurization step of a petroleum-refining or petrochemical process and comprises at least one of sulfide and mercaptide, and wherein the oxidizing agent and the spent caustic are supplied to the reactor along different connection pipes from each other;
mixing the spent caustic supplied from the spent caustic supplier and the oxidizing agent supplied from the oxidizing agent supplier in a section of pipe upstream of the reactor, thereby preparing a mixed solution consisting of the spent caustic and the oxidizing agent in the section;
oxidizing the spent caustic by passing the mixed solution through catalyst structures in the reactor while irradiating ultraviolet rays, thereby generating gas and liquid in the reactor;
moving the gas and the liquid generated in the reactor to the gas and liquid separator spaced apart from and positioned below the reactor;
separating the gas and the liquid generated in the reactor with the gas and liquid separator, wherein the liquid separated by the separation treatment is returned to the spent caustic supplier; and
discharging the spent caustic in which treatment reaction is completed by the oxidation treatment by a discharger, wherein the spent caustic is sent to the discharger from the spent caustic supplier once a pH of the spent caustic in the spent caustic supplier is in a range of 10-14.