Method of preparing needle coke raw oil from oil slurry

Abstract

The invention belongs to the field of petrochemical engineering, and specifically relates to a method of preparing needle coke raw oil from oil slurry. The method comprises following steps: adding oilslurry into n-alkanes with a low molecular weight at a certain temperature, removing the asphaltene, allowing the system to stand still, saving the upper layer; carrying out solvent extraction, allowing the system to stand still, saving the lower layer; removing the solids; after solid removal, subjecting oil rich in aromatic hydrocarbons to fraction cutting; and after fraction cutting, subjecting the oil rich in aromatic hydrocarbons to hydrogenation to remove sulfur and nitrogen to obtain needle coke raw oil. The invention provides a needle coke raw material preprocessing method, low quality oil slurry is processed to obtain a stable needle coke raw material, after the preprocessing, low quality oil slurry can be used as needle coke raw oil, and the preprocessing device can stably workfor a long term.

Description

technical field [0001] The invention belongs to the petrochemical field, and in particular relates to a method for preparing needle coke raw material oil from oil slurry. Background technique [0002] Needle coke is a high-quality carbon material, which is a silver-gray porous solid with metallic luster. It is named after the particles are slender and needle-shaped after crushing. Needle coke is a high-quality material for manufacturing high-power and ultra-high-power electrodes. Graphite electrodes made of needle coke have strong thermal shock resistance, high mechanical strength, good oxidation performance, low electrode consumption and large allowable current density, etc. Advantages, the needle coke currently produced can be divided into two types: petroleum-based and coal-based according to the raw materials used. There is a great domestic demand for petroleum-based coke materials, and needle coke is currently mainly used in steelmaking and battery materials. Needle ...

AI Technical Summary

Problems solved by technology

[0003] Oil slurry is the raw material for the production of oil-based needle coke. Oil slurry is the product distilled from the bottom of the fractionation tower in the catalytic cracking process, which contains part of uncracked wax oil. If it is re-refined, the conversion rate of raw materials can be improved, and the output of gasoline and diesel can be increased. , but due to the existence of a large amount of colloids and asphaltenes, they will adhere to the surface of the catalyst and coke during the refining process, resulting in rapid deactivation of the catalyst. Therefore, most refineries use oil slurry as a raw material for delayed coking or as a The blended oil of fuel oil is sold at a low price, with low economic value and serious waste of resources

[0004] At present, the countries that can produce needle coke on a large scale in the world are mainly the United States, Japan and other countries. In recent years, my country has a great demand for petroleum-based needle coke materials, but the raw materials for production are insufficient. More demanding

The raw materials of catalytic cracking in my country are heavy, and the content of impurities such as metals is high. Therefore, the oil slurry has high sulfur and nitrogen content, high asphaltene content, and high ash content. Direct use cannot meet the requirements of needle coke raw materials.

If ordinary processes are used to remove impurities such as sulfur nitrogen, asphaltene, and catalyst powder, it is difficult to achieve the desired effect, and the device basically cannot operate stably for a long period of time

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