LOW-CTE, LOW-PUFFING NEEDLE COKE

摘要

The purpose of the present invention is to more stably obtain low-CTE, low-puffing needle coke while responding to changes in the properties of the crude oil feedstock. This low-CTE, low-puffing needle coke is characterized by mixing and coking secondary crude oil feedstock that has strong hydrogen donor properties and a 5.0 or higher PDQI value, indicated in fig. (1), with needle coke main crude oil feedstock of coal tar heavy oil or petroleum-based heavy oil that has weak hydrogen donor properties and a less-than-5.0 PDQI value, indicated in fig. (1), and calcining the thusly obtained raw coke. [Formula (1)] PDQI = H% × 10 × (HNβ/H) Here, H% is the amount of hydrogen (wt%) obtained by elemental analysis, and HNβ/H is the ratio of β-naphthenic hydrogen and total hydrogen measured by ¹H-NMR).