Indian Oil Corporation Limited

Jitumoni Brahma

Sankara Sri Venkata Ramakumar

Gurpreet Singh Kapur

Madhusudan Sau

Satyen Kumar Das

Ponoly Ramachandran Pradeep

Terapalli Hari Venkata Devi Prasad

Shivam Ashok Dixit

Prantik Mondal

Rajesh

High-quality graphite/needle grade coke is produced with reduced impurity levels and improved coefficient of thermal expansion using an integrated hydrotreatment, catalytic cracking and coking reaction sections, employing a combination of highly paraffinic hydrotreated VGO stream and aromatic CLO stream, which is thereafter processed in a delayed coking section.

Process for production of needle coke

The present invention relates to a sequential thermo-chemical treatment along with adsorption-based pre-treatment process for residual oils having a very high naphthenic acid content. First stage of the process is a thermal pre-treatment step which results into generation of hydrocarbon stream with a reduced naphthenic acid content due to high temperature. In second stage of pre-treatment, generated hydrocarbon stream from stage-is subjected to esterification reaction with alcohol, such as methanol, to further reduce the TAN of hydrocarbon stream. After recovery of alcohol from the reaction mixture, depending on TAN reduction required reaction mixture may be subjected to an adsorption stage, third stage pre-treatment, where an adsorbent mixture comprising of FCC spent catalyst is used to adsorb the TAN of feed hydrocarbon stream. The treated hydrocarbon stream is then co-processed with DCU feed stock for producing lighter hydrocarbons.

Pre-treatment process for conversion of residual oils in a Delayed Coker Unit

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Faridabad, India

Jitumoni Brahma