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Purification method for coal tar maltha

A technology for coal tar and soft pitch, which is applied in the field of coal tar soft pitch purification, can solve the problems of unstable needle coke product quality and the requirement of ultra-high power electrode level, etc., to improve the grade, simplify cooling and forming, and save energy. Effect

Active Publication Date: 2013-03-13
山西永东化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many domestic enterprises have also extended the needle coke production method of solvent refining→delayed coking→calcination on the basis of the original process, but in terms of quality, the quality of the needle coke products produced is still unstable and has not yet reached the ultra-high production method of Japanese enterprises. Level requirements for power electrodes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment one: the implementation steps of the inventive method are:

[0015] The coal tar meeting the standard YB / T5075—2010 standard is processed by conventional means, and the coal tar pitch with a softening point of 30-40°C is cut, and the coal tar pitch is sent to the next-door coal tar pitch extraction tower through a temperature-resistant and viscosity-resistant reciprocating pump ;

[0016] The industrial-grade N-methylacetamide and the naphthalene oil cut from the tar tower are heated to 110-250°C respectively through a reboiler.

[0017] Industrial-grade N-methylacetamide or naphthalene oil cut from a tower of tar is mixed with a static mixer at a weight ratio of 1:5 to become an extractant.

[0018] The extractant and coal tar pitch are mixed in a static mixer at a weight ratio of 1:1, and after being fully stirred and mixed, they are added from the upper part of the partition coal tar pitch extraction tower; compounds such as sulfur and nitrogen in the coa...

Embodiment 2

[0020] Embodiment two: the implementation steps of the inventive method are:

[0021] Coal tar that meets the standard YB / T5075-2010 standard is processed by the normal pressure one-tower process, and the coal tar pitch with a softening point of 30-40°C is cut, and the coal tar pitch is sent into the next-door coal mine through a reciprocating pump with temperature resistance and viscosity resistance. asphalt extraction tower;

[0022] 200# solvent oil and tar are cut out of the washing oil and heated to 110-250°C respectively through a reboiler.

[0023] Cut 200# solvent oil or tar from one tower and mix it with a static mixer at a weight ratio of 1:5.5 to become an extractant.

[0024] The extractant and coal tar pitch are mixed with a static mixer at a weight ratio of 1:1.05, and after being fully stirred and mixed, they are added from the upper part of the next-door coal tar pitch extraction tower; The coal tar pitch is purified after removal of compounds such as sulfur ...

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Abstract

A purification method for coal tar maltha aims to save energy and improve grade of coal asphalt raw material. The method provided by the invention comprises the steps of: conducting rough machining on the coal tar, cutting coal tar pitch with a softening point of 30-40 DEG C, and sending into a bulkhead type coal tar pitch extraction column for extraction; respectively heating an aliphatic extraction solvent and an aromatic extraction solvent to 110-250 DEG C; taking 0.5-1 part of an aliphatic solvent and 3-5 parts of an aromatic solvent, and mixing the two into an extractant by a static mixer; thoroughly stirring and mixing the extractant and coal tar pitch by a proportion of 1:0.5-1.3 with the static mixer, and adding the mixture from the upper part of the bulkhead type coal tar pitch extraction column; discharging the sulfur nitrogen compound in coal tar pitch and combined with the extractant from bottom of the extraction column, so as to purify coal tar pitch by removal of sulfur compounds; and discharging the coal tar pitch from the middle part of the bulkhead type coal tar pitch extraction column.

Description

technical field [0001] The invention relates to a method for purifying coal tar soft pitch. Background technique [0002] Coal tar soft pitch is the main raw material for the production of needle coke, and the quality and cost of needle coke are closely related to the raw material. In the existing needle coke production process, coal tar soft pitch usually needs to be purified. The existing purification processes mainly include vacuum distillation separation process, centrifugal separation process, polymerization modification process, etc. Although the vacuum distillation separation process is simple in process, the raw material yield is low. The refining effect of the centrifugal separation process is average, but the raw material yield is moderate, but the investment is large. The polymerization modification process is formed by vacuum flash evaporation-polycondensation modification in a polymerization kettle, and the investment in equipment is large. At present, Japan'...

Claims

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Application Information

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IPC IPC(8): C10C3/00C10C3/08C10C3/06
Inventor 刘东玉刘冀生
Owner 山西永东化工股份有限公司
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