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A continuous process for preparing high-quality needle coke from heavy oil

A technology of needle coke and heavy oil, applied in the continuous process field, can solve the problems of poor quality of needle coke and complex needle coke process, etc., and achieve the effect of less ash, good conductivity and low thermal expansion coefficient

Active Publication Date: 2018-09-11
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention mainly solves the problems that the existing preparation process of needle coke is complex and the quality of the produced needle coke is poor

Method used

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  • A continuous process for preparing high-quality needle coke from heavy oil

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Experimental program
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Effect test

Embodiment 1

[0022] Use dimethyl sulfoxide to extract the heavy fraction of FCC oil slurry to obtain aromatic-rich components with a molecular weight of 350-500, add them to the carbonization reactor 1, and blow nitrogen to purge and replace the air with a flow rate of 2 L / min. After sweeping 3 times, the temperature was raised to 480°C at a constant speed of 2°C / min. Under nitrogen conditions, the pressure was 3Mpa, and the reaction was carried out for 1h. The heavy components in the carbonization reactor 1 were added to the carbonization reactor 2. At 420°C, react for 7 hours to obtain needle coke with a true density of 2.10g·cm -3 , thermal expansion coefficient 1.5×10 -6 / °C, the ash content is 0.01%.

[0023] The true density is measured by the method of GB / T2540-81 (88); the coefficient of thermal expansion (CTE) is tested by the method of the national standard GB3074-5-82.

Embodiment 2

[0025] Use the four-line cut fraction of dimethyl sulfoxide naphthenic crude oil to extract and obtain the aromatic-rich component with a molecular weight of 350-500, add it to the carbonization reactor 1, and feed nitrogen to purge and replace the air with a flow rate of 2L / min. After purging 3 times, the temperature was raised to 490°C at a constant rate of 2°C / min. Under nitrogen conditions, the pressure was 2Mpa, and the reaction was 2h. The heavy components in the carbonization reactor 1 were added to the carbonization reactor 2. At a pressure of 2Mpa, At a temperature of 420°C, react for 8 hours to obtain needle coke with a true density of 2.30 g·cm -3 , thermal expansion coefficient 1.7×10 -6 / °C, the ash content is 0.02%.

Embodiment 3

[0027] Use dimethyl sulfoxide to extract the deasphalted oil of naphthenic vacuum residue oil to obtain aromatic-rich components with a molecular weight of 350-500, add them to carbonization reactor 1, and blow nitrogen to purge and replace the air with a flow rate of 2L / min, after purging 3 times, the temperature was raised to 500°C at a constant speed of 2°C / min, under nitrogen condition, with a pressure of 3Mpa, and reacted for 3h, the heavy components in the carbonization reactor 1 were added to the carbonization reactor 2. Pressure 1Mpa, temperature 450°C, react for 10h to obtain needle coke with a true density of 2.15g·cm -3, , thermal expansion coefficient 1.8×10 -6 / ℃, ash content 0.01%

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Abstract

The invention relates to a continuous process for preparing high-quality needle coke from heavy oil, and belongs to the technical field of preparation of high-grade carbon materials. Using the heavy fraction of FCC oil slurry, the fourth-line fraction of naphthenic crude oil and / or the deasphalted oil of naphthenic vacuum residue as raw materials, after pretreatment, and then through a two-step reaction process, high-quality needle coke. The process includes the following steps: (1) Pretreat the raw material, then enter the carbonization reactor 1, and react at a temperature of 480-520°C, under nitrogen, a pressure of 1-6Mpa, and a space velocity of 0.3-1h-1. ‑3h, the top oil gas enters the high fraction tank 1, and then enters the low fraction tank 1 for separation to obtain the oil and gas byproduct; Under the pressure of 0-2Mpa, the volume space velocity is 0-0.4h-1, and the reaction is 6-12h. The needle coke product produced is discharged from the lower outlet through the hydraulic decoking process to obtain needle coke with a small amount of oil and gas at the top Enter the high fraction tank 2, and then enter the low fraction tank 2 for separation and recovery to obtain oil and gas by-products.

Description

technical field [0001] The invention relates to a continuous process for preparing high-quality needle coke by using heavy oil as a raw material through two-step reactions, and belongs to the technical field of preparation of high-quality needle coke made of advanced new carbon materials. Background technique [0002] Needle coke is a new type of carbon material, which is one of the carbonization products of petroleum pitch or coal pitch. Needle coke is a silver-gray porous solid with metallic luster, and it is a high-quality carbon raw material. Needle coke is a molecular crystal of macromolecule condensed aromatic hydrocarbons. The aromatic hydrocarbons are stacked in layers, and the graphite-like microcrystalline units have a high degree of orientation. Needle focus has obvious fibrous structure and high anisotropy under the microscope. Needle coke has some properties such as high strength ratio, high specific modulus, high shock resistance, ablation resistance, high el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G51/02C10G9/00C10B1/00
CPCC10B1/00C10G9/005C10G51/023C10G2300/1037C10G2300/1074C10G2300/1077C10G2300/1081
Inventor 刘东娄斌陈朋杨远兮吴中华郭爱军殷长龙陈坤吴萍萍夏薇李明于冉李志恒何笑雨于洋马倩倩陈鹏赵明
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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