Production method of needle coke raw material

Abstract

The invention discloses a method of needle coke raw material by using delay coking technique to treat FCC slurry oil and conventional coking raw material. The method comprises: introducing FCC slurry oil with low temperature into a delay coking tower from the upper part inside the tower, leading the introduced FCC slurry oil to be contacted with high temperature oil gas generated by the conventional coking raw material which is introduced into the tower from the bottom and treated by high temperature decomposition, and reacting under the condition of delay coking; and separating the generated oil gas in a coking fractionating tower, and obtaining the needle coke raw material. In the method, as the FCC slurry oil enters into the coking tower at the lower temperature, the decomposition temperature of the conventional coking raw material is lowered, the high temperature decomposition time of the raw material is shortened, the occurrence of secondary reaction is reduced, green coke rate is reduced, the stable operation cycle of a signal tower is prolonged, and light components which have high reaction activity and are not beneficial to producing the needle coke, heavy components with high polymerization activity, and a great deal of impurities such as catalyst powder, heavy metal and the like can be removed. The obtained needle coke has high yield and good properties.

Description

technical field [0001] The invention belongs to a process method for producing needle coke raw materials. Specifically, it is a method of producing needle coke raw materials by delayed coking process, and producing light distillate oil and coke at the same time. Background technique [0002] Needle coke is the main raw material for the production of high-power, ultra-high-power graphite electrodes. The most critical issue in the production of needle coke is the selection and pretreatment of raw materials. According to the coking mechanism of needle coke, the raw material for needle coke production must meet the high content of aromatics, among which the content of linearly connected tricyclic and tetracyclic short side chain aromatics is mostly, and the content of aromatics is generally required to reach 30%-50%; and asphaltene content is low, colloid and asphaltene itself are macromolecular condensed rings or hydrocarbon compounds with long side chains, the molecular stru...

AI Technical Summary

Problems solved by technology

This method requires a separate vacuum distillation device, and the distilled fractions need to be further hydrotreated, and the hydrotreated oil needs to be further separated. The cost of hydrogenation itself is high and the investment is large.

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