US 11,859,132 B2
Process and an apparatus for conversion of waste plastic pyrolysis oil into valuable products
Shahil Siddiqui, Faridabad (IN); Ponoly Ramachandran Pradeep, Faridabad (IN); Vijayan Kanattukara Bineesh, Faridabad (IN); Satyen Kumar Das, Faridabad (IN); Madhusudan Sau, Faridabad (IN); Gurpreet Singh Kapur, Faridabad (IN); and Sankara Sri Venkata Ramakumar, Faridabad (IN)
Assigned to INDIAN OIL CORPORATION LIMITED, Mumbai (IN)
Filed by Indian Oil Corporation Limited, Mumbai (IN)
Filed on Aug. 2, 2022, as Appl. No. 17/816,951.
Claims priority of application No. 202121035419 (IN), filed on Aug. 5, 2021.
Prior Publication US 2023/0047205 A1, Feb. 16, 2023
Int. Cl. C10G 1/10 (2006.01); C10G 1/00 (2006.01); C10G 7/04 (2006.01); C10G 9/00 (2006.01)
CPC C10G 1/002 (2013.01) [C10G 1/10 (2013.01); C10G 7/04 (2013.01); C10G 9/005 (2013.01); C10G 9/007 (2013.01); C10G 2300/1003 (2013.01); C10G 2300/301 (2013.01); C10G 2300/4006 (2013.01); C10G 2300/4012 (2013.01); C10G 2300/708 (2013.01); C10G 2400/20 (2013.01)] 13 Claims
 
1. A process for conversion of waste plastic pyrolysis oil into value added products, wherein the process comprises:
melting a waste plastic feedstock inside a preheating vessel, wherein the waste plastic feedstock is melted by a heavy coker gas oil (HCGO) to form a molten plastic stream;
pyrolyzing the molten plastic stream in a pyrolysis reactor in presence of nitrogen, wherein the pyrolysis reactor generates a char component from a bottom portion thereof, and a vapour component from a top portion thereof;
condensing the vapour component using a heat exchanger into a condensed stream, wherein the condensed stream is routed to a separator tower to separate gases and condensed liquid;
separating the condensed liquid in a two phase separator, wherein the condensed liquid is separated into a pyrolysis oil stream and water;
fractionating the pyrolysis oil stream through a fractionator into a heavier cut, and a lighter cut, wherein the lighter cut is fed directly to a light coker gas oil (LCGO) section of a delayed coker fractionator;
mixing a hot heavy residual feedstock, and the heavier cut of the pyrolysis oil stream to obtain a mixed stream, wherein the mixed stream is fed to the delayed coker fractionator wherein the mixed stream is further mixed with a condensed recycle to provide a resulting mixture, and pumping the resulting mixture through a coker furnace to achieve a desired coking temperature of 470° C. to 500° C.;
thermally cracking the resulting mixture inside the coker furnace, wherein the thermal cracking results in partial vaporization and mild cracking of the resulting mixture to give a two-phase mixture; and
thermally cracking the two-phase mixture inside a plurality of coke drums, wherein the heavier cut of the pyrolysis oil stream along with a heavy residue go through the thermal cracking resulting an effluent from the coke drum, coke, and a wash liquid.