A combined process of coal tar processing and coal co-smelting

A combined process and coal tar technology, applied in the chemical industry, can solve the problems of low content of polycyclic aromatic hydrocarbons, easy coking of reactants, poor hydrogen supply capacity, etc., and achieve the effects of improving conversion efficiency, preventing coking, and reducing energy consumption

Active Publication Date: 2021-03-16
SHAANXI YANCHANG PETROLEUM GRP
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Untreated full-fraction coal tar partially hydrogenated has low polycyclic aromatic hydrocarbon content, poor hydrogen supply capacity, and contains a large amount of colloidal asphaltenes. Therefore, according to the patent CN104419437A, the coal and coal tar are directly liquefied. Although it can Realize the co-processing of coal and coal tar, but in the process of processing high-colloid and bituminous coal tar, it faces problems such as low conversion rate and easy coking of reactants. At the same time, coal tar contains high oxygen compounds, of which phenol and its derivatives The content of these phenols can reach 8%-30%. These phenols have high economic value, and the direct hydrogenation reaction will increase the hydrogen consumption in the reaction process, and the economic benefit is low.

Method used

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  • A combined process of coal tar processing and coal co-smelting
  • A combined process of coal tar processing and coal co-smelting
  • A combined process of coal tar processing and coal co-smelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] see figure 1 figure 2 , the coal tar 13 is sent to the distillation unit 1 for separation, and the separated light components enter the tar phenol extraction unit 3 to obtain crude phenol 15 and raffinate oil 16, and the heavy components, heavy oil hydrogenation catalyst 14, and circulating oil slurry 31 enter the mixing tank 2 After being fully stirred, enter the pre-hydrogenation reaction unit 4 together with the hydrogen gas 17; the pre-hydrogenation reaction unit 4 includes three bubbling bed reactors connected in series, the operating pressure is 16MPa, the temperature is 447°C, the volume ratio of hydrogen to oil is 1600, and the air The speed is 1.42h -1 The gas-liquid products of the pre-hydrogenation reaction unit 4 enter the hot high-pressure separator 5, the medium-temperature high-pressure separator 6, and the low-temperature high-pressure separator 7 successively to obtain high-temperature solvent oil 18, low-temperature solvent oil 19 and light oil 28, a...

Embodiment 2

[0038] Example 2 adopts the same process flow as Example 1, the difference is that the operating pressure of the bubbling bed reactor in the pre-hydrogenation reaction device is 16MPa, the temperature is 450°C, the volume ratio of hydrogen to oil is 1600, and the space velocity is 1.54h -1 At the same time, medium and low temperature coal tar 2 with high colloid and asphaltene content is used as raw material, and the concentration of oil-coal slurry entering the kerosene co-refining reaction device is 43%.

[0039] Properties of low temperature coal tar in Table 1

[0040]

[0041]

[0042] Table 2 Dry basis coal powder properties

[0043] project unit West Bay Cleaned Coal Industrial Analysis Ash wt% 8.40 Volatile matter wt% 34.02 Elemental analysis carbon content wt% 75.06 hydrogen content wt% 4.38 Sulfur content wt% 0.54 nitrogen content wt% 0.94 oxygen content wt% 10.36 H / C a...

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Abstract

A coal tar processing and coal co-processing combined process includes steps: firstly, subjecting a coal tar light component to phenol extraction treatment; then, subjecting coal tar heavy distillateto prehydrogenation to promote conversion of colloid and asphaltene in heavy distillate into partially hydrogenated polyaromatic hydrocarbon, so that the hydrogen supply performance of the heavy distillate can be improved; finally, mixing liquid-phase products in different distillation ranges in a separator after hydrogenation with coal powder, and adding into a coal-oil co-processing device to obtain gasoline, diesel and phenol products, so that coal tar and coal co-processing is realized. By combination of coal tar phenol extraction, heavy distillate prehydrogenation and coal-oil co-processing processes, quality-based utilization of coal tar is realized, a great quantity of solvent oil with the great hydrogen supply performance is provided for coal-oil co-processing, the coal tar and coal conversion efficiency is remarkably improved, and the process has advantages of low hydrogen consumption, high oil yield, great economic benefits and benefits to long-period large-scale operation ofa coal-oil co-processing device and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a combined process of coal tar processing and coal co-smelting. Background technique [0002] Coal liquefaction technology refers to the advanced coal cleaning technology that converts coal into liquid fuels, chemical raw materials and products through deep hydrocracking reactions under the action of hydrogen and catalysts. my country is a big coal producer and also a big consumer of fuel oil. The dependence on foreign crude oil is close to 60%. Therefore, the development of coal hydrogenation liquefaction technology is to realize the clean and efficient utilization of coal resources, ensure the safety of my country's energy and environment, and alleviate my country's environmental pollution. One of the important ways to pollute the status quo. [0003] Shenhua Group has developed the direct coal liquefaction (CDCL) technology (Chinese Patent No. 1587351) wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/00C10C1/04C10G1/00
CPCC10C1/04C10G1/002C10G67/00C10G2300/1007
Inventor 韩磊李大鹏王明峰霍鹏举高亚男王永娟黄传峰程秋香杨天华刘树伟王焜
Owner SHAANXI YANCHANG PETROLEUM GRP
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