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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AI-Extracted Technical Summary

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...

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.

Application Domain

Tar working-up by water removalTar working-up by distillation

Technology Topic

ChemistryFuel oil +7

Image

Examples

Experimental program(3)

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 solution to separate the alkaline sodium phenolate and dephenolic oil, and then the alkaline sodium phenolate is removed by steaming to remove the neutral. After the oil is decomposed with 60% sulfuric acid.

[0025] 3. Separation

[0026] The naphthalene fraction after dephenolization is heated to 295°C and enters the distillation tower 5 for deoiling. The naphthalene fraction of 217°C~247°C is cut from the top of the tower, and part of it is refluxed to the top of the tower after condensation. Produce finished heavy wash oil.

[0027] 4. Distillation

[0028] The naphthalene fraction is heated to 270°C and then enters the rectification tower 6. The 215°C fraction cut from the top of the tower is condensed and partially refluxed to the top of the tower. The rest is finished product 95 naphthalene, and the bottom fraction is finished product methyl naphthalene.

[0029] 5. Heavy oil distillation

[0030] The heavy wash oil is heated to 385°C by the heating furnace 7 and then enters the rectification tower 8. The 280°C-340°C fraction cut from the top of the tower is condensed and partially refluxed to the top of the tower. The rest is sold as product anthracene oil, and the pitch is distilled from the bottom of the tower.

[0031] Product quality quantity table

[0032] Name

[0033] Asphalt

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 solution to separate the alkaline sodium phenolate and dephenolic oil, and then the alkaline sodium phenolate is removed by steaming to remove the neutral. After the oil is decomposed with 30% sulfuric acid.

[0040] 3. Separation

[0041] The naphthalene fraction after dephenolization is heated to 295°C and enters the distillation tower 5 for deoiling. The naphthalene fraction at 215°C~245°C is cut from the top of the tower and partly refluxed to the top of the tower after condensation, and the rest is sent to the next process for rectification, and the bottom of the tower is distilled. Produce finished heavy wash oil.

[0042] 4. Distillation

[0043] The naphthalene fraction is heated to 265°C and then enters the rectification tower 6. The 218°C fraction cut from the top of the tower is condensed and partially refluxed to the top of the tower. The rest is finished product 95 naphthalene, and the bottom fraction is finished product methyl naphthalene.

[0044] 5. Heavy oil distillation

[0045] The heavy wash oil is heated to 395°C by the heating furnace 7 and then enters the rectification tower 8. The 280-350°C fraction cut from the top of the tower is condensed and partially refluxed to the top of the tower. The rest is sold as product anthracene oil, and the pitch is distilled from the bottom of the tower.

[0046] Product quality quantity table

[0047]

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 solution to separate the alkaline sodium phenolate and dephenolic oil, and then the alkaline sodium phenolate is removed by steaming to remove the neutrality. After the oil is decomposed with 40% sulfuric acid.

[0054] 3. Separation

[0055] The naphthalene fraction after dephenolization is heated to 300°C and enters the distillation tower 5 for deoiling. The naphthalene fraction at 216~250°C is cut from the top of the tower and partially refluxed to the top of the tower after condensation, and the rest is sent to the next process for rectification, and the bottom of the tower is distilled Finished heavy washing oil.

[0056] 4. Distillation

[0057] The deoiled three-mixed fraction is heated to 270°C and then enters the rectification tower 6. The 220°C fraction cut from the top of the tower is condensed and partially refluxed to the top of the tower. The rest is finished product 95 naphthalene, and the bottom fraction is finished product methyl naphthalene.

[0058] 5. Heavy oil distillation

[0059] The heavy wash oil is heated to 400°C by the heating furnace 7 and then enters the distillation tower 8. The fraction cut from the top of the tower at 281°C to 348°C is partially refluxed to the top of the tower after being condensed. The rest is sold as finished anthracene oil, and the pitch is distilled from the bottom of the tower.

[0060] Product quality quantity table

[0061]

[0062] Heavy wash oil

PUM

Property	Measurement	Unit
Softening point	99.2	°C

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Simple process
easy to operate

Method for extracting multiple chemical products from coal-tar oil

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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