Coal tar processing and coal co-processing combined process

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, low economic benefits, etc., and achieve the effects of improving conversion efficiency, preventing coking and increasing economic benefits

Active Publication Date: 2019-02-19
SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 bitumin

Method used

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  • Coal tar processing and coal co-processing combined process
  • Coal tar processing and coal co-processing combined process
  • Coal tar processing and coal co-processing combined process

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, the separated light component enters the tar phenol extraction unit 3 to obtain crude phenol 15, raffinate oil 16, the heavy component and heavy oil hydrogenation catalyst 14, the circulating oil slurry 31 enters the mixing tank 2 After sufficient stirring, it enters the pre-hydrogenation reactor 4 together with hydrogen 17; the pre-hydrogenation reactor 4 includes 3 bubble-bed reactors connected in series, operating pressure 16MPa, temperature 447°C, hydrogen-to-oil volume ratio 1600, air 1.42h -1 ; The gas-liquid products of the pre-hydrogenation reactor 4 enter the thermal high-pressure separator 5, the medium-temperature high-pressure separator 6, and the low-temperature high-pressure separator 7, to obtain high-temperature solvent oil 18, low-temperature solvent oil 19 and light oil 28, high-temperature solvent oil 18 Directly enter the kerosene co-refining unit 9; the top te...

Embodiment 2

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

[0039] Table 1 Properties of medium and low temperature coal tar

[0040]

[0041]

[0042] Table 2 Properties of dry coal powder

[0043] project

unit

Xiwan Clean Coal

Industrial analysis

Ash

wt%

8.40

Volatile

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 atomic ratio

-

0.70

Coal lithofacies analysis

Vitrinite group

wt%

63.2

Inert group

wt%

32.6

Chitin group

wt%...

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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 particularly relates to a combined process of coal tar processing and coal co-refining. Background technique [0002] Coal liquefaction technology refers to 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 a big consumer of fuel oil. The dependence on crude oil is close to 60%. Therefore, the development of coal hydroliquefaction technology is to realize the clean and efficient utilization of coal resources, ensure the safety of my country’s energy environment, and alleviate my country’s environment. One of the important methods of pollution status. [0003] Shenhua Group has developed a direct coal liquefaction (CDCL) technology (Chinese patent 1587351) with my country's independent property rights, achieving a pr...

Claims

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Application Information

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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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