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Low-temperature coal tar pretreatment technology

A low-temperature coal tar and pretreatment technology, which is applied in the direction of multi-stage series refining process, can solve the problems of difficult power supply, high operating costs, and complicated process, so as to improve the effect of pretreatment and prevent corrosion of equipment , the effect of reducing the content of impurities

Active Publication Date: 2016-06-29
LUOYANG PETROCHEMICAL ENG CORP SINOPEC +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN101012385A has proposed a kind of pretreatment method of coal tar, and it is to utilize distillate oil and aromatic hydrocarbon to carry out two-stage extraction to coal tar and remove most of ash content, and the purification effect of solvent extraction separation method is better, but solvent consumption is big, and technological process is complicated, High operating costs; CN201316557Y discloses a skid-mounted device for coal tar desalination and dehydration using an AC-DC composite electric field, which is mainly aimed at various medium and high temperature coal tars, but cannot adapt to low temperature coal tar processing The preliminary removal of impurities such as , moisture, and inorganic substances will inevitably cause carbon deposits on the electrodes, making subsequent power-on difficult
[0007] From the point of view of the traditional coal tar pretreatment process, there are disadvantages of high energy consumption, low efficiency, and poor effect, especially with the popularization and application of coal tar hydrogenation upgrading process, the index requirements for coal tar pretreatment process significantly improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Coal tar is a black wax, opaque, with a pungent and unpleasant smell. The analysis results of coal tar properties are shown in Table 1.

[0024] As can be seen from Table 1, the coal tar is a low-quality oil product with high density, heavy fraction, high nitrogen content, low sulfur content, high content of colloids, asphaltenes, and aromatics, and coal tar contains a large amount of oil that is not conducive to subsequent Hydrotreated impurity elements. The coal tar has a water content of about 2%, a salt content of 10 mg / L, and a relatively high calcium and iron content in the metal content, which are 109 μg / g and 38 μg / g, respectively.

[0025] Table 1 Properties of coal tar

[0026]

[0027] Taking the processing of the low-temperature coal tar as an example, the specific process implementation steps are described in detail:

[0028] The coal tar is heated to 60°C, the coal tar is settled and separated in the storage tank, and part of the waste water can be d...

Embodiment 2

[0033] The raw material oil of treatment is still the low-temperature coal tar in embodiment 1, and this coal tar is directly processed by this process technology without blending light oil process, and its specific process implementation steps are described in detail below:

[0034]Heat the coal tar to 70°C, the coal tar will be settled and separated in the storage tank, and part of the waste water can be discharged from the bottom. After pumping out the raw material oil, inject 30 μg / g of demulsifier and 100 μg / g of dechlorination agent into the pipeline before the mixer. Inject 15% by weight of fresh water, mix with coal tar in the mixer, enter the heat exchanger through the pipeline to exchange heat to 80 ° C, enter the three-phase centrifuge for high-speed centrifugation, and the centrifugal speed is 4500r / min; after centrifugation, It can remove most solid impurities and salts, including ammonium chloride and ammonium thiocyanate; at the same time, it can also separate mo...

Embodiment 3

[0039] The raw material oil treated is still the low-temperature coal tar in Examples 1 and 2, and the mixed diesel oil at 200-300°C is selected as the blended hydrocarbon oil, wherein the diesel fraction at 200-220°C accounts for 20%wt, and 220-240°C accounts for 20% wt, 240-260°C accounts for 20%wt, 260-280°C accounts for 20%wt, and 280-300°C accounts for 20%wt.

[0040] The diesel oil is blended in different proportions, and the influence of the blending ratio on the pretreatment effect of coal tar is investigated. The specific process implementation steps are described in detail below:

[0041] First heat the coal tar to 75°C, the coal tar settles and separates in the storage tank, and part of the waste water can be discharged from the bottom, and then the coal tar and diesel oil are respectively in the volume ratio of 10:0.5, 10:1.0, 10:1.5, 10:2.0 , 10:2.5, 10:3.0 blending, use the raw oil pump and the blending oil pump to pump out and mix in the mixer, enter the heat ex...

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Abstract

The invention discloses a low-temperature coal tar pretreatment technology. The pretreatment technology comprises the following steps: heating coal tar to the temperature of 50-80 DEG C for settling separation, mixing the low-temperature coal tar without separated waste water, 10-100 [mu]mg / g of a de-emulsifier, 0-200 [mu]mg / g of a dechlorinating agent, and 5-20 wt% of water, by metering with gross weight of a mixture, heating the raw materials to the temperature of 60-90 DEG C and centrifuging the raw materials, heating the low-temperature coal tar without separated waste water to the temperature of 90-140 DEG C, introducing the raw materials into a primary electrical desalter through a primary mixer for primary electrical desalting, and introducing the low-temperature coal tar after primary electrical desalting into a secondary electrical desalter through a secondary mixer for secondary electrical desalting to obtain the coal tar. The technology has the advantages of high production efficiency, good pretreatment effect, and low energy consumption.

Description

field of invention [0001] The invention relates to the deep processing of coal tar, and provides a process method for pretreatment of low-temperature coal tar, Background technique [0002] Coal tar is a black viscous liquid obtained in the process of carbonization and gasification of coal. Coal tar has a high density at room temperature, has a special pungent odor, high nitrogen content, low saturated hydrocarbon content, high residual carbon content, colloidal asphaltenes The content is high, and its composition is extremely complex. There are more than 500 species that have been separated and identified, and its main components can be divided into aromatic hydrocarbons, phenols, heterocyclic nitrogen compounds, heterocyclic sulfur compounds and heterocyclic epoxy compounds. [0003] With the development of economy and society, non-renewable resources such as oil are decreasing day by day. At the same time, people have higher and higher requirements for oil quality. Coal h...

Claims

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Application Information

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IPC IPC(8): C10G53/02
Inventor 唐应彪崔新安袁海欣申明周邹洋许兰飞
Owner LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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