Method for extracting multiple chemical products from coal-tar oil

A technology for chemical products and coal tar, which is applied in tar processing by distillation and tar removal by water, etc., can solve the problems of poor quality assurance of asphalt, low concentration of naphthalene, complicated production process, etc., and achieve high quality asphalt. Good, simple process, low energy consumption

Active Publication Date: 2008-03-12
浙江美阳国际工程设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

At the same time, an inhibitor is added to inhibit or slow down the coking in the furnace tube or in the reactor, so as to ensure the long-term operation of the device, but t

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  • Method for extracting multiple chemical products from coal-tar oil

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Example Embodiment

[0019] Example 1

[0020] Referring to the drawings, the present invention is carried out according to the following process steps:

[0021] 1. Dehydration

[0022] Heat 100kg coal tar to 120°C through heat exchanger 9, enter dehydration tower 1, and reflux for a period of time. After the operation is stable, remove the water and light oil at the top of the tower, and leave it to stand to separate light oil products. The tar at the bottom of the tower is sent to the next process for processing.

[0023] 2. Initial distillation

[0024] The tar from which water and light oil have been removed is heated to 290°C by the tube furnace 2 and then enters the distillation tower 3. The top of the tower cuts the three mixed fractions at 185°C~249°C and sends it to the scrubber 4 for dephenolization. The heavy oil distilled from the bottom of the tower The fraction is heated in the heating furnace 7. The dephenolization of the three mixed fractions is washed with 30% sodium hydroxide solutio...

Example Embodiment

[0034] Example 2

[0035] Referring to the drawings, the present invention is carried out according to the following process steps:

[0036] 1. Dehydration

[0037] Heat 100kg coal tar to 130°C through heat exchanger 9, enter dehydration tower 1, and reflux for a period of time. After the operation is stable, remove the water and light oil at the top of the tower, and leave it to stand still to separate light oil products. The tar at the bottom of the tower is sent to the next process for processing.

[0038] 2. Initial distillation

[0039] The tar from which water and light oil have been removed is heated to 300°C by the tube furnace 2 and then enters the distillation tower 3. The top of the tower cuts the three-mixed fraction at 186°C~246°C and sends it to the scrubber 4 for dephenolization. The heavy oil distilled from the bottom of the tower The fraction is heated in the heating furnace 7. The dephenolization of the three mixed fractions is washed with 15% sodium hydroxide so...

Example Embodiment

[0048] Example 3

[0049] Referring to the drawings, the present invention is carried out according to the following process steps:

[0050] 1. Dehydration

[0051] Heat 100kg coal tar to 125°C through heat exchanger 9, enter dehydration tower 1, and reflux for a period of time. After the operation is stable, remove the water and light oil at the top of the tower, and leave it to stand still to separate light oil products. The tar at the bottom of the tower is sent to the next process for processing.

[0052] 2. Initial distillation

[0053] The tar from which water and light oil have been removed is heated to 295°C by the tube furnace 2 and then enters the distillation tower 3. The top of the tower cuts the three-mixed fraction at 187°C~247°C and sends it to the scrubber 4 for dephenolization. The heavy oil distilled from the bottom of the tower The fractions are heated in the heating furnace 7. The dephenolization of the three mixed fractions is washed with 20% sodium hydroxide ...

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Abstract

The invention discloses a method for extracting a plurality of chemicals from a coal tar, which comprises such procedures as heating the coal tar to 120-130 DEG C, dehydrating, fore running, separating, fine rectifying, and heavy-oil distilling, and getting 95 naphthalene, methyl naphthalene, anthracene oil, asphalt and heavy oil. The invention is of simple process, easy operation, rectifies coal tar several times; the extracted chemical products are of steady quality, the naphthalene is of high concentration, and the asphalt is of good quality. The invention is of low energy consumption, hence improves better the added value in processing coal tar in China.

Description

technical field [0001] The invention relates to the technical field of coal tar processing, in particular to a method for extracting various chemical products from coal tar. Background technique [0002] At present, in general tar processing, the anthracene oil and asphalt are always separated first, and then the three-mixed fraction is cut for processing. The disadvantage is that the separated asphalt needs to be processed with anthracene oil to adjust the softening point of the asphalt. Complicated and energy-intensive. [0003] The patent application number is: 200410012455.1, "Method for producing chemical products and fuel oil from coal tar", which fractionates coal tar into light and heavy fractions. The light fraction is light coal tar and tar pitch. Light fractions are hydrorefined or upgraded to produce light products. The processing of tar pitch is combined with coking oven or delayed coking, not only to produce more chemical products such as phenol, naphthalene ...

Claims

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Application Information

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IPC IPC(8): C10C1/02C10C1/04
Inventor 杨东平
Owner 浙江美阳国际工程设计有限公司
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