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Process for producing high-softening-point gilsonite from coal tar heavy oil through vacuum deep extraction

A technology with high softening point and hard pitch, applied in the direction of tar processing by distillation, which can solve the problems of high viscosity and difficulty in meeting process requirements.

Active Publication Date: 2017-04-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Because coal tar heavy oil is easy to polymerize and coke when heated, and has a high viscosity, the existing vacuum deep drawing technology is difficult to meet the technological requirements for producing high softening point hard asphalt from coal tar heavy oil

Method used

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  • Process for producing high-softening-point gilsonite from coal tar heavy oil through vacuum deep extraction

Examples

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Effect test

Embodiment 1

[0019] Example 1, the heavy coal tar oil at 80°C is exchanged with vacuum wax oil and vacuum residue oil to 260°C respectively through vacuum residue heat exchanger (1) and vacuum wax oil heat exchanger (2) , and then mixed with the injected 5%, 280°C high superheated water vapor through the static mixer (3), the mixed oil vapor enters the decompression heating furnace (4) radiant section (5) and is heated to 420°C, and is decompressed The oil line (14) enters the flash section (8) of the vacuum tower (7) at high speed, and the vacuum residue oil is separated from the wax oil gas and water vapor by flash evaporation; the vacuum residue oil is stripped through the stripping section (9) tray After separating the entrained wax oil and gas, it flows to the bottom of the vacuum tower (7), and the bottom of the vacuum tower (7) maintains a high liquid level of 4 meters, and the steam injection distributor at the bottom evenly injects 0.6% superheated steam at 280°C , carry out high-...

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Abstract

Provided is a process for producing high-softening-point gilsonite from coal tar heavy oil through vacuum deep extraction. The coal tar heavy oil obtained by separating coal tar and superheated vapor are mixed and enter a pressure reduced heating furnace radiation section to be heated to 390 DEG C to 450 DEG C, and the vapor is heated into superheated steam through a convection section; after the superheated steam enters a vacuum tower flash section to be flashed through a vacuum transfer line, the steam enters the bottom of a vacuum tower after being subjected to steam stripping through a steam stripping section tower plate, the high liquid level of 2-5 meters is kept at the bottom of the vacuum tower, and 0.1%-1% of superheated steam is evenly injected through a bottom steam injection distributor; wax oil is recycled from flashed oil gas through a vacuum tower rectifying section, gas is cooled to -30 DEG C to 40 DEG C through a tower top forced medium refrigeration condenser, and it is ensured that a pressure reduced vacuum pump achieves high vacuum; and vacuum residues at the bottom of the vacuum tower are discharged, subjected to heat exchange, pelleted and cooled, and the high-softening-point gilsonite is obtained.

Description

[0001] 1. Technical field [0002] The invention provides a process for producing hard asphalt with a high softening point under reduced pressure and deep drawing of coal tar heavy oil, and relates to the field of coal chemical industry. [0003] 2. Background technology [0004] As an important product in the coal chemical process, coal tar is a black or dark brown viscous liquid obtained in the process of low-temperature carbonization or coking of coal. Its output accounts for about 3% to 20% of coal, and its product is black viscous liquid under normal temperature and pressure. [0005] Coal tar is the main raw material of the coal chemical industry, with tens of thousands of components, mainly containing aromatics such as benzene, toluene, xylene, naphthalene, anthracene, and aromatic oxygen-containing compounds (such as phenolic compounds such as phenol), nitrogen, Sulfur-containing heterocyclic compounds and other organic substances can be used as important raw materials...

Claims

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Application Information

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IPC IPC(8): C10C1/16
CPCC10C1/16
Inventor 田原宇乔英云田斌
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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