Purification method for coal tar soft pitch

A technology for soft pitch and coal tar, which is applied in the field of coal tar soft pitch purification, and achieves the effects of high separation temperature, high separation efficiency and high process yield

Inactive Publication Date: 2012-12-26
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Purpose of the present invention provides a kind of purification method of coal tar soft asphalt in order to overcome above-mentioned shortcoming and deficiency of prior art just, to solve the removal problem of quinoline insoluble matter in soft asphalt, thereby improve the product yield of producing with soft asphalt and quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Coal tar soft asphalt with a softening point of 39°C, a QI content of 4.8%, and a solvent density of 0.88g / cm 3 The coking light oil, soft asphalt and solvent mass ratio 1:1.5 are mixed, stirred and mixed evenly at 130°C, kept warm and entered into a centrifuge, and continuously centrifuged at the same temperature, the separation factor is 2800G, and the clear liquid and residue are obtained. The clear liquid was distilled under reduced pressure to obtain purified soft asphalt with a softening point of 40°C and a QI content of 0.04%.

Embodiment 2

[0025] Coal tar soft pitch with a softening point of 40°C, a QI content of 6.5%, and a solvent density of 0.82g / cm 3 Diesel oil, soft asphalt and solvent are mixed at a mass ratio of 1:1.3, stirred and mixed evenly at 220°C, kept warm and entered into a centrifuge, continuously centrifuged at the same temperature, and the separation factor is 2100G to obtain clear liquid and residue. The clear liquid was distilled under reduced pressure to obtain purified soft asphalt with a softening point of 39°C and a QI content of 0.02%.

Embodiment 3

[0027] Coal tar soft pitch with a softening point of 41°C, a QI content of 5.2%, and a solvent density of 0.90g / cm 3 Diesel, soft asphalt and solvent are mixed at a mass ratio of 1:1.1, stirred and mixed evenly at 200°C, kept warm and entered into a centrifuge, and continuously centrifuged at the same temperature, with a separation factor of 2100G, to obtain clear liquid and residue. The clear liquid was distilled under reduced pressure to obtain purified soft asphalt with a softening point of 38°C and a QI content of 0.01%.

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PUM

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Abstract

The present invention relates to a purification method for coal tar soft pitch. The method is characterized by comprising: stirring and uniformly mixing coal tar soft pitch with a softening point of 30-60 DEG C and a solvent according to a mass ratio of 1:0.5-1.5 at a temperature of 120-300 DEG C; carrying out thermal and adding the resulting material to a continuous centrifuge; carrying out continuous centrifugation separation at the same temperature to obtain a supernatant and residue; carrying out vacuum distillation on the supernatant; removing the solvent to obtain the purified pitch; and recovering the solvent to reuse. The method of the present invention has the following advantages and effects that a dissolution property of the soft pitch in the solvent and a process yield can be significantly improved, difficulties of mixing and separation are significantly decreased, and operation and maintenance are convenient.

Description

technical field [0001] The invention relates to a method for purifying coal tar soft pitch, specifically a method for removing quinoline insolubles in coal tar pitch by dissolving coal tar soft pitch with a solvent, and belonging to the field of coal chemical industry. Background technique [0002] When using coal tar soft pitch as raw material to produce high value-added carbon products such as needle coke for ultra-high power electrodes, carbon fiber, impregnating agent pitch, etc., due to the quinoline insolubles in coal tar soft pitch, referred to as QI, it Seriously hinder the production of the above-mentioned products, it must be purified, while effectively removing QI, retain the original effective components in the asphalt to the greatest extent, and improve the yield of purified asphalt. Since the particle size of most QI in coal tar pitch is about 2 μm, it is very difficult to remove these QI effectively. [0003] For example, US4956895A discloses a method for rem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/00C10C3/08C10C3/06
Inventor 熊杰明
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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