Coking method for coal-oil mixed pitch

A technology of mixing asphalt and coal tar pitch, which is applied in coking carbonaceous materials, coke ovens, petroleum industry, etc., can solve the problems of low green coke density, high impurity content, and poor organizational structure, and achieve low impurity content and increase carbon content , good organizational structure

Active Publication Date: 2014-08-06
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the prior art, when using petroleum-based and coal-based raw materials to prepare needle coke, the mixed raw material system must first be heat-treated or copolymerized to change the compatibility of the two before coking. To realize the preparation of needle coke, the steps are complicated, and the prepared green coke has low density, high content of impurities such as sulfur and nitrogen, and poor structure, so as to provide an easy-to-operate and simple-step coal-oil mixed asphalt Coking method

Method used

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Embodiment 1

[0031] The present embodiment provides a method for coking coal-oil system mixed asphalt, which comprises the following steps:

[0032] (1) Pretreatment of mixed asphalt: mix medium-temperature coal tar pitch with a softening point of 70°C and petroleum asphalt with a softening point of 40°C in a weight ratio of 9:1 and mix them uniformly at 200°C to obtain a mixed asphalt, then mix the The mixed asphalt and washing oil are mixed according to the weight ratio of 1:2 and kept at 220°C for 40 minutes, and subjected to 2000G centrifugal force and 180°C for 2 minutes to obtain the raw material mother liquor;

[0033] After the raw material mother liquor is heated to 370°C, it is pumped into a vacuum kettle with an absolute pressure of 20Kpa for flash evaporation. When the temperature of the raw material mother liquor drops to 250°C, the flash evaporation ends, and the material at the bottom of the vacuum kettle is ready It is refined asphalt; the softening point of the refined asp...

Embodiment 2

[0040] The present embodiment provides a method for coking coal-oil system mixed asphalt, which comprises the following steps:

[0041] (1) Pretreatment of mixed asphalt: mix medium-temperature coal tar pitch with a softening point of 70°C and petroleum asphalt with a softening point of 45°C in a weight ratio of 3:2 and mix them uniformly at 200°C to obtain mixed asphalt, and then mix the The mixed asphalt and washing oil are mixed according to the weight ratio of 1:1 and kept at 250°C for 50 minutes, and subjected to 3000G centrifugal force and centrifuged at 200°C for 5 minutes to obtain the raw material mother liquor from which impurities have been removed;

[0042] After the raw material mother liquor is heated to 380°C, it is pumped into a vacuum kettle with an absolute pressure of 30Kpa for flash evaporation. When the temperature of the raw material mother liquor drops to 240°C, the flash evaporation ends, and the material at the bottom of the vacuum kettle is ready It i...

Embodiment 3

[0050] The present embodiment provides a method for coking coal-oil system mixed asphalt, which comprises the following steps:

[0051] (1) Pretreatment of mixed asphalt: mix medium-temperature coal tar pitch with a softening point of 80°C and petroleum asphalt with a softening point of 48°C in a weight ratio of 1:1 and mix them uniformly at 200°C to obtain a mixed asphalt, and then mix the The mixed asphalt and washing oil are mixed according to the weight ratio of 1:9 and kept at 280°C for 60 minutes, and subjected to 4000G centrifugal force and centrifuged at 220°C for 8 minutes to obtain the raw material mother liquor from which impurities have been removed;

[0052] After the raw material mother liquor is heated to 390°C, it is pumped into a vacuum kettle with an absolute pressure of 40Kpa for flash evaporation. When the temperature of the raw material mother liquor drops to 250°C, the flash evaporation ends, and the material at the bottom of the vacuum kettle is ready It...

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Abstract

The invention relates to a coking method for coal-oil mixed pitch. The coking method comprises the following steps: coal pitch and oil pitch are mixed in accordance to appropriate proportion and pretreated under certain condition to prepare refined pitch; the refined pitch is taken as a preparation raw material for needle coke; the characteristics of the coal pitch such as macromolecular aromatics structure and being capable of forming favorable organization structure are fully utilized and lower impurity content of the oil pitch, particularly lower QI content and impurity atom content as well as the cross-linked effect of micro-molecules are combined. According to the coking method, the negative influence caused by too much impurities and light constituent in the oil pitch is effectively avoided, the quality level of green coke is effectively improved, the carbon content is improved, the volatile component and ash content are reduced, therefore, the obtained needle coke is low in impurity content, favorable in organization structure, simultaneously procedures in the whole coking process is simple and the operation is convenient.

Description

technical field [0001] The invention relates to a coking method for coal-oil system mixed asphalt, which belongs to the technical field of needle coke preparation. Background technique [0002] Needle coke is the main raw material for producing ultra-high power graphite electrodes and high power graphite electrodes. Graphite electrodes made of needle coke have strong thermal shock resistance, high mechanical strength, good oxidation performance, low electrode consumption and allowable current High density and other advantages, so the market demand is huge. At present, the needle coke produced can be divided into two categories: petroleum-based needle coke and coal-based needle coke according to the different raw materials used. Among them, petroleum-based needle coke is mostly produced from heavy petroleum oil, while coal tar pitch and its fractions are called coal-based needle coke. Petroleum-based raw materials such as catalytic oil slurry contain more aliphatic side cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B55/00
Inventor 任相坤王培崔永君郑李辉尹明亮丁艳
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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