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A pretreatment process for low temperature coal tar

A low-temperature coal tar pretreatment technology, which is applied in the direction of multi-stage series refining process treatment, can solve the problems of high operating cost, difficult power supply, complicated process, etc., to prevent corrosion of equipment and improve pretreatment effect , the effect of extending the operating cycle

Active Publication Date: 2017-11-24
SINOPEC LUOYANG PETROCHEM ENG CORP +1
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  • Summary
  • 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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  • A pretreatment process for low temperature coal tar
  • A pretreatment process for low temperature coal tar
  • A pretreatment process for low temperature coal tar

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 processed is still the low-temperature coal tar in embodiment 1, and this coal tar is not processed in the process of blending light oil, and is directly processed by this process technology, 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...

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 process. The coal tar is heated to 50-80°C for sedimentation and separation, and the low-temperature coal tar, demulsifier 10-100 μg / g and dechlorination agent 0-200 μg / g are separated from waste water. g. Mix 5-20% by weight of water, based on the total weight of the mixture, heat to 60-90°C for centrifugal separation, and heat the low-temperature coal tar from which impurities are separated to 90-140°C, and enter the first-stage electric desalination through the first-stage mixer The low-temperature coal tar after the first-stage electric desalination enters the second-stage electric desalination tank through the second-stage mixer for the second-stage electric desalination to obtain the pretreated coal tar. This process has high production efficiency and good pretreatment effect ,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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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/02
Inventor 唐应彪崔新安袁海欣申明周邹洋许兰飞
Owner SINOPEC LUOYANG PETROCHEM ENG CORP