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Coal tar treatment method based on supercritical methanol

A technology of supercritical methanol and a treatment method, applied in the field of coal tar treatment based on supercritical methanol, can solve the problems of high cost, difficult operation, increased cost, etc., and achieve the effects of weakening association, strong dissolving ability, and low cost

Inactive Publication Date: 2019-04-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] It can be seen from the above patents that the current coal tar treatment requires some solvents, such as xylene, acetone, decahydronaphthalene, etc., and the cost of these solvents is relatively high, and the pollution to the environment is relatively large.
In addition, due to the addition of catalyst and hydrogen, it will also cause difficulties for subsequent operations, and also increase the cost

Method used

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  • Coal tar treatment method based on supercritical methanol
  • Coal tar treatment method based on supercritical methanol
  • Coal tar treatment method based on supercritical methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The raw material is selected from Shaanxi coal medium and low temperature coal tar, and the raw material properties are as follows in Table 1. This embodiment is carried out in a batch reactor without adding a semi-open device. The solvent of the batch reactor is 200ml, and the magnetic stirrer and The stirrer base is combined, and the batch reactor is shown in Figure 3 (a), and the volume of the batch reactor is 200ml. Process such as figure 1 As shown, 10g of coal tar and 20g of supercritical methanol are placed in a batch reactor (that is, the ratio of alcohol to oil is 2:1), and the bottom of the tank is fed, that is, no semi-open device is added. After sealing, purge with argon for 5 minutes to ensure that there is no air remaining in the kettle. Then set the parameters of the temperature controller, such as figure 2As shown, the batch reaction kettle was placed in a heating mantle, and the temperature inside the kettle was heated from room temperature 20°C to 4...

Embodiment 2

[0048] The selection of embodiment 2 is Shaanxi coal medium and low temperature coal tar (same as embodiment 1), and the addition of coal tar quality, feeding method, reaction equipment and detection equipment is the same as example 1, and the heating time, reaction time, alcohol-oil ratio, distillation of product The range distribution and heteroelement content are shown in Table 1. From Example 1 and Example 2, the yield of light oil (IBP-350 ° C) is significantly improved relative to raw material coal tar, and the yield of distillation range 350-750 ° C (heavy components) is reduced to a certain extent, indicating that after super After critical methanol treatment, the coal tar is lightened. In addition, the content of N elements decreased, which also confirmed that coal tar has a certain denitrification effect.

[0049] Table 1 embodiment 1 and 2 reaction conditions and result comparison

[0050] project

Embodiment 3-6

[0052] The selection of embodiment 3-6 is Shaanxi coal medium and low temperature coal tar (same as embodiment 1), adding coal tar quality, feeding method, reaction equipment, detection equipment are the same as example 1, heating time, reaction time, alcohol-oil ratio, product The yield of each distillation range is as table 2. Compared with the raw material coal tar, the yield of light oil in the product has been significantly increased, and the yield of the distillation range 350-750 ° C (heavy components) has decreased to a certain extent, indicating that after supercritical methanol treatment, coal tar has achieved light weight .

[0053] Table 2 Example 3-6 reaction conditions and product comparison

[0054] project

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Abstract

The invention provides a coal tar treatment method based on supercritical methanol. The method comprises the following steps: adding a certain amount of coal tar into a batch-type reaction kettle witha stirrer, mixing the coal tar and a corresponding ratio of the methanol, replacing the air in the kettle by using an inert gas, performing heating to 350-450 DEG C, performing heat preservation for30-90 min, wherein temperature control accuracy is + / - 5 DEG C, and performing cooling to obtain lightweight oil with reduced viscosity, distillation range and heteroatom content. According to the method provided by the invention, improvement of the batch-type reaction kettle is mainly that the interior of the kettle is additionally provided with a semi-open container, the material adding positionis controlled, preliminary separation of the product can be realized, and the problem that a current batch-type reaction kettle can only perform a reaction and cannot perform separation is solved; and the method can realize pretreatment of the coal tar under relatively-mild conditions, the recovery rate of the methanol is high, and the product can be preliminarily separated.

Description

technical field [0001] The invention relates to the technical field of coal tar treatment, in particular to a coal tar treatment method based on supercritical methanol. Background technique [0002] China is rich in coal resources and is the world's largest coal producer as well as the largest coal consumer. For a long time, China's primary energy consumption is mainly coal, accounting for more than 60%. In 2016, crude oil, natural gas, raw coal, hydropower, nuclear energy, renewable energy, and clean energy accounted for 19.0%, 6.2%, 61.8%, 8.6%, 1.6%, 2.8%, and 13.0% of my country's primary energy consumption, respectively. . With the rapid development of the economy, the demand for energy is also increasing, and oil as the "blood of industry" cannot meet the demand. Therefore, the coal-to-oil technology is gaining more and more attention. As a by-product of coal processing, coal tar can be divided into low-temperature coal tar (450-650°C), medium-low temperature coal t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G57/00
CPCC10G57/00
Inventor 方涛陈康闫挺姜召樊英杰
Owner XI AN JIAOTONG UNIV
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