US 11,788,013 B2
Process for production of needle coke
Ponoly Ramachandran Pradeep, Faridabad (IN); Shivam Ashok Dixit, Faridabad (IN); Prantik Mondal, Faridabad (IN); Jitumoni Brahma, Faridabad (IN); Rajesh, Faridabad (IN); Terapalli Hari Venkata Devi Prasad, 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, Maharashtra (IN)
Filed on Sep. 17, 2021, as Appl. No. 17/478,692.
Claims priority of application No. 202021040506 (IN), filed on Sep. 18, 2020.
Prior Publication US 2022/0089955 A1, Mar. 24, 2022
Int. Cl. C10B 57/08 (2006.01); C10B 55/00 (2006.01); C10B 57/02 (2006.01); C10G 7/00 (2006.01); C10G 9/00 (2006.01); C10G 11/16 (2006.01); C10G 31/09 (2006.01); C10G 45/02 (2006.01); C10G 67/14 (2006.01); C10G 67/16 (2006.01)
CPC C10B 57/08 (2013.01) [C10B 55/00 (2013.01); C10B 57/02 (2013.01); C10G 7/00 (2013.01); C10G 9/005 (2013.01); C10G 11/16 (2013.01); C10G 31/09 (2013.01); C10G 45/02 (2013.01); C10G 67/14 (2013.01); C10G 67/16 (2013.01); C10G 2300/1074 (2013.01); C10G 2300/1096 (2013.01); C10G 2300/202 (2013.01); C10G 2300/4081 (2013.01); C10G 2400/06 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A process for production of graphite/needle grade coke with reduced impurity levels and improved coefficient of thermal expansion, wherein the process comprises:
(a) routing a vacuum gas oil (VGO) feed to a riser reactor of a fluid catalytic cracking unit, wherein the VGO feed reacts with a hot catalyst supplied from a regenerator, and wherein the fluid catalytic cracking unit is operated at a reactor outlet temperature of 550 to 650° C., at a pressure in a range of 0.7 to 2.5 Kg/cm2 (g) and having a catalyst to oil ratio in a range of 10 to 25;
(b) sending products of reaction from step (a) along with a catalyst to a stripper for separation of a hydrocarbon vapor product from the catalyst;
(c) sending the hydrocarbon vapor product to a first fractionator column for separation into different products comprising off gases with naphtha, light cycle oil (LCO), and heavy cycle oil (HCO);
(d) mixing a VGO stream with H2 and sending to a furnace for heating to obtain a hot feed;
(e) sending the hot feed from step (d) to a fixed bed reactor, wherein hydrotreatment of the VGO stream occurs to obtain a hydrotreated VGO stream at a reactor pressure in a range of 30-55 Kg/cm2 (g) and a temperature in a range of 300-380° C., and wherein reaction products are sent to a high-pressure separator where lighter gases are removed and sent to a low-pressure separator;
(f) sending a liquid after removing the lighter gases from the reaction products to a second fractionator column for further separation of lighter products;
(g) routing a stream consisting of the hydrotreated VGO stream from the second fractionator column and a clarified oil (CLO) product fraction to a bottom section of the first fractionator column, wherein the clarified oil (CLO) product fraction is generated in the fluid catalytic cracking unit, wherein the hydrotreated VGO stream comprises aromatics about 19 wt % and a mixture of paraffins and naphthenes about 80 wt %, wherein the CLO product fraction comprises aromatics about 98 wt % and a mixture of paraffins and naphthenes about 2 wt %;
(h) exchanging heat between the hydrotreated VGO stream and the CLO product fraction occurring in the bottom section of the first fractionator column and forming a homogenous mixture, wherein a lighter fraction in the hydrotreated VGO stream boiling at a temperature of not more than 350° C. is separated in the first fractionator column, wherein weight percentage of the hydrotreated VGO stream in the homogenous mixture is in a range of 20-50 wt %;
(i) sending the homogenous mixture through a parallel filtration assembly for separation of entrained catalyst fines present; and
(j) routing the homogenous mixture after catalyst removal to a third fractionator column of a delayed coking section.