Catalytic cracking-delayed coking combined process for preparing needle coke

A technology of catalytic cracking and delayed coking, which is applied in the field of needle coke preparation by combined process of catalytic cracking and delayed coking, which can solve the problems of not being able to meet the large cycle ratio, achieve the effect of "promoting coke pulling", improve the uniform distribution of system temperature, and disperse Promoted effect

Active Publication Date: 2018-02-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the "coke pulling" stage, a large circulation ratio is usually used to feed the material to ensure that enough gas escapes from the system, and the amount of circulating oil generated by the coking tower itself often cannot meet the demand for a large circulation ratio

Method used

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  • Catalytic cracking-delayed coking combined process for preparing needle coke
  • Catalytic cracking-delayed coking combined process for preparing needle coke
  • Catalytic cracking-delayed coking combined process for preparing needle coke

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The coking tower and the combined process method for preparing needle coke according to the present invention are adopted, wherein the height from the upper feed port of the coking tower to the bottom of the tower is 4 / 5 of the total tower height, and the height of the packing section at the bottom of the tower is 1% of the total tower height / 10.

[0036] The basic properties of the catalytic cracking raw oil are shown in Table 1, and the process conditions of the catalytic cracking unit are shown in Table 2. The catalyst is RICC-1. The catalytic cracking products enter the fractionation system to separate out gas, light oil, middle distillate oil and catalytic oil slurry. Among them, the middle distillate oil and catalytic oil slurry are filtered to reduce the ash content to less than 0.1%. In addition, the distillation range of middle distillates is 382°C to 459°C; the cycle oil produced by delayed coking is >355°C fraction.

[0037] Table 1 Basic properties of FCC ...

Embodiment 2

[0043] Example The needle coke was prepared by the method of the present invention, the difference from Example 1 is that the operating conditions of the delayed coker are different.

[0044] The coking heating furnace adopts variable temperature control, the initial temperature is 450°C and maintained for 13h, and then the temperature is raised to 505°C at a rate of 3°C / h and maintained for 2h. When the outlet temperature of the heating furnace is at a constant temperature of 450°C, the middle distillate oil and catalytic oil slurry generated by the catalytic cracking unit enter the coking tower from the upper feed port; The circulating oil generated by the oil and coking unit enters the coking tower from the lower feed port until the end of the constant temperature of 505°C, wherein the feeding amount of the circulating oil is 1 times that of the middle distillate oil. During the whole reaction process, the temperature in the coking tower ranges from 433°C to 497°C, and the ...

Embodiment 3

[0046] Example The needle coke was prepared by the method of the present invention, the difference from Example 1 is that the operating conditions of the delayed coker are different.

[0047] The coking heating furnace adopts variable temperature control, the initial temperature is 440°C and is kept for 16h, and then the temperature is raised to 500°C at a rate of 4°C / h and kept for 2h. When the outlet temperature of the heating furnace is at a constant temperature of 440°C, the middle distillate oil and catalytic oil slurry generated by the catalytic cracking unit enter the coking tower from the upper feed port; The circulating oil generated by the oil and coking unit enters the coking tower from the lower feed port until the end of the constant temperature of 500 ° C, wherein the feeding amount of the circulating oil is 1 times that of the middle distillate oil. During the whole reaction process, the temperature in the coking tower ranges from 433°C to 497°C, and the initial...

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Abstract

The present invention discloses a method for preparing needle-like coke through a catalytic cracking-delayed coking combination process. The method comprises that catalytic cracking raw material oil enters a catalytic cracking apparatus and is subjected to a reaction, and the generated oil-gas is separated to obtain gas, light oil, middle distillate oil, and catalytic oil slurry; the middle distillate oil and the catalytic oil slurry enter a coking tower, and the oil-gas generated from the reaction is separated to obtain gas, light oil and circulation oil; and when a coking heating furnace is subjected to two-stage heating, the middle distillate oil and the circulation oil enter the coking tower in a mixed manner until the reaction period is ended. According to the present invention, with the method, the large area eurytopic intermediate phase is easily formed, and the coke drawing effect of the eurytopic intermediate phase is easily promoted.

Description

technical field [0001] The invention relates to a method for preparing needle coke, in particular to a method for preparing needle coke by a catalytic cracking-delayed coking combined process. Background technique [0002] Needle coke has the characteristics of low CTE and easy graphitization, and is the preferred material for the production of high-power and ultra-high-power graphite electrodes. During the formation of needle coke, the raw material oil needs to go through the process of formation, growth and fusion of small mesophase spheres, develop into a wide-area mesophase, and then form a linear texture structure under the action of air flow, and finally solidify Produce needle coke. In the early stage of coking, excessive disturbances in the system should be avoided to ensure the slow and stable development of mesophase spheres. The degree of development of mesophase directly affects the product performance of needle coke; It is necessary to continuously have airflo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G55/06
Inventor 郭丹初人庆勾连忠矫德卫
Owner CHINA PETROLEUM & CHEM CORP
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