Kettle-type method for preparing needle coke

A needle coke and kettle-type technology, applied in coking ovens, coking carbonaceous materials, petroleum industry, etc., can solve the problems of needle coke with many local mosaic structures, poor mutual solubility, uneven air distribution, etc., and achieve easy control of the reaction process , Reduce the viscosity of the system and simplify the operating conditions

Inactive Publication Date: 2013-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned invention has the following disadvantages: (1) The invention requires that the material be heated to 480-550°C within 2-30 seconds, which is difficult to realize industrially; , and then the method of preparing needle coke is released during the reaction. Since the inert gas can only be filled into the upper space of the reactor and cannot be dissolved in the material, the gas is released during the reaction, and the flow of the inert gas will not affect the intermediate phase. (3) In the later stage of the reaction, the polymerization reaction is dominant, and the cracking gas generation rate is slowed down, which is not enough to form sufficient side pressure and shear force, so that the entire anisotropic region is forced to align when the gas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Use catalytic cracking residual oil as raw material, close the constant pressure valve, and slowly raise the temperature of the system. When the system pressure reaches 1.5MPa, adjust the constant pressure valve to keep the system pressure constant at 1.5MPa. When the system temperature reaches 450°C, Keep the temperature constant for 3 hours, collect the oil and gas discharged during the process and separate the 200~400°C fraction;

[0020] (2) After the constant temperature is finished, close the constant pressure valve, cool the system down to 300°C, add the collected distillate oil at 200~400°C into the coking kettle through the feeding tank, and keep the temperature constant for 1 hour;

[0021] (3) After the constant temperature is over, the system slowly heats up to 500°C, and the exhaust volume is controlled by the temperature rise rate to 0.04h -1 , the pressure is 1.5MPa;

[0022] (4) The temperature of the system is raised to 520°C, and it is scorched fo...

Embodiment 2

[0024] (1) Use coal tar that removes quinoline insolubles as the raw material, close the constant pressure valve, and slowly heat up the system. When the system pressure reaches 1.0MPa, adjust the constant pressure valve to keep the system pressure constant at 1.0MPa. When the temperature reaches 430°C, keep the temperature constant for 5 hours, collect the oil and gas discharged during the process and separate the 200~400°C fraction;

[0025] (2) After the constant temperature is finished, close the constant pressure valve, cool down the system to 250°C, add the collected distillate oil at 200~400°C to the coking kettle through the oil pump, and keep the temperature constant for 3 hours;

[0026] (3) After the constant temperature is over, the system slowly heats up to 480°C, and the exhaust volume is controlled by the temperature rise rate to 0.5h -1 , the pressure is 1.0MPa;

[0027] (4) The temperature of the system is raised to 540°C, and it is scorched for 5 hours, and ...

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PUM

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Abstract

The invention discloses a kettle-type method for preparing needle coke, which comprises the following steps: (1) adding raw oil into a coking kettle, heating to 430-480 DEG C, keeping the constant temperature for 2-6 hours while controlling the pressure of 0.5-2.0 MPa, collecting the discharged oil gas, and separating out 200-400 DEG C fraction; (2) after finishing keeping the constant temperature, closing the exhaust port, cooling the system to 200-400 DEG C, adding the 200-400 DEG C fraction collected in the step (1), and keeping the constant temperature for 1-4 hours; (3) after finishing keeping the constant temperature, and slowly heating the system to 430-500 DEG C, wherein the heating speed is controlled to control the exhaust amount at 0.01-1h<-1> and the system pressure at 0.5-2.0 MPa; and (4) heating the system to 520-550 DEG C, and coking for 1-4 hours, wherein the needle coke generated by reaction is deposited on the coking tower bottom. The method can be used for producing high-quality needle coke; and the operational process is easy to control, is simple and feasible, and is suitable for industrial application.

Description

technical field [0001] The invention relates to a method for preparing needle coke in a kettle, in particular to a method for preparing needle coke with petroleum-based or coal-based raw materials. Background technique [0002] Needle coke is the main raw material for producing high-power and ultra-high-power graphite electrodes, and its economic value is very high. At present, needle coke is mainly produced by delayed coking process, selecting suitable raw materials and obtaining needle coke under suitable delayed coking conditions. When producing needle coke, there are generally high requirements for raw materials. The production technology of needle coke in the prior art mainly focuses on the acquisition or preparation of raw materials, such as CN00125962.8, CN200510073095.0, etc. There are not many improvement plans in itself. [0003] CN01140582.1 discloses a method for preparing needle coke. Put raw materials into a tubular reactor, fill it with an inert gas of 0.1-2...

Claims

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Application Information

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IPC IPC(8): C10B55/00
Inventor 初人庆蒋立敬杜正军矫德卫勾连忠
Owner CHINA PETROLEUM & CHEM CORP
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