The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 20, 2009
Filed:
Jul. 15, 2004
Debasis Bhattacharyya, Haryana, IN;
Satheesh Vetterkunnel Kumaran, Haryana, IN;
Bandaru Venkata Hari Prasad Gupta, Haryana, IN;
Pramod Kumar, Haryana, IN;
Asit Kumar Das, Haryana, IN;
Gadari Saidulu, Haryana, IN;
Satyen Kumar Das, Haryana, IN;
Gurpreet Singh Kapur, Haryana, IN;
Veena Bansal, Haryana, IN;
Venkatachalam Krishnan, Haryana, IN;
Satish Makhija, Haryana, IN;
Sobhan Ghosh, Haryana, IN;
Niranjan Raghunath Raje, Haryana, IN;
Debasis Bhattacharyya, Haryana, IN;
Satheesh Vetterkunnel Kumaran, Haryana, IN;
Bandaru Venkata Hari Prasad Gupta, Haryana, IN;
Pramod Kumar, Haryana, IN;
Asit Kumar Das, Haryana, IN;
Gadari Saidulu, Haryana, IN;
Satyen Kumar Das, Haryana, IN;
Gurpreet Singh Kapur, Haryana, IN;
Veena Bansal, Haryana, IN;
Venkatachalam Krishnan, Haryana, IN;
Satish Makhija, Haryana, IN;
Sobhan Ghosh, Haryana, IN;
Niranjan Raghunath Raje, Haryana, IN;
Indian Oil Corporation Limited, Mumbai, IN;
Abstract
A process is disclosed for producing needle coke from heavy atmospheric distillation residues having sulfur no more than 0.7 wt %, which process involves the steps of heating the feedstock to a temperature in the range of 440 to 520° C. for thermal cracking in a soaking column under pressure in the range of 1 to 10 kg/cmto separate the easily cokable material, separating the cracked products in a quench column and a distillation column and then subjecting the hydrocarbon fraction from the bottom of the quench column and a hydrocarbon fraction having a boiling point in the range of 380 to 480° C. from the distillation column and/or any other suitable heavier hydrocarbon streams in a definite ratio depending on certain characteristic parameters to thermal cracking in a second soaking column at a temperature of 460 to 540° C., pressure in the range of 2 to 20 kg/cmin presence of added quantity of steam for formation of a mesophase carbonaceous structure which on steam stripping and cooling forms a solid crystalline coke suitable for manufacturing of graphite electrode of large diameter having co-efficient of thermal expansion lower than 1.1×10/° C. measured on graphite artifact in the temperature range of 25 to 525° C.