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Coal tar treatment method

A treatment method, coal tar technology, applied in tar processing, tar processing through distillation, petroleum industry, etc., can solve the problems of imprecise separation of fractions, poor quality of asphalt, and low quality of asphalt, so as to achieve reasonable utilization of heat energy and improve quality, and the effect of reducing energy consumption

Active Publication Date: 2013-04-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process reduces energy consumption, saves water consumption, and reduces costs, but it also has disadvantages such as imprecise fraction separation, low product concentration, and low asphalt quality.
[0010] It can be seen that in the above-mentioned existing process, there are problems such as imprecise separation of coal tar fraction, low concentration of key components, poor quality of asphalt, inability to utilize the inherent potential of the system, and device efficiency.

Method used

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Examples

Experimental program
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Effect test

Embodiment approach

[0047] According to one embodiment of the present invention, the processing method of coal tar provided by the present invention is according to image 3 The process flow shown is implemented.

[0048] 1) Mix coal tar with sodium carbonate solution to obtain a mixed product, and send the mixed product to the heat exchangers E1, E2, E3, E4, E5, E6 and E7 through the pump P1 in order to be mixed with the produced light oil , phenol oil, naphthalene oil, wash oil, mono-anthracene oil, di-anthracene oil and asphalt fractions are heat-exchanged, then heated by heater E8 and then sent to the first stage of evaporator F1 for dehydration and separation, so that most of the water and boiling point are low The light oil component at 100°C is discharged from the top of the first evaporator F1, and the tar component is discharged from the bottom of the first evaporator F1;

[0049] 2) The tar component discharged in step 1) is sent to the second-stage evaporator F2 through the pump P2 th...

Embodiment 1

[0065] use image 3 The process flow shown is carried out.

[0066] 1) Coal tar is mixed with sodium carbonate solution (the concentration of sodium carbonate solution is 10% by weight), and the pH value after mixing is 7.5, and the product after mixing is obtained, and the product after mixing is sent into by pump P1 successively Perform heat exchange in heat exchangers E1, E2, E3, E4, E5, E6 and E7 to obtain a mixed product with a temperature of 120°C, then heat the mixed product to 150°C, and send it to into the first-stage evaporator F1 for dehydration and separation, most of the water and light oil components with a boiling point below 100°C are discharged from the top of the first-stage evaporator F1, and tar components are discharged from the bottom of the first-stage evaporator F1. Among them, the first-stage evaporator F1 has a temperature of 105°C and a pressure of 110kPa.

[0067] 2) The tar component discharged in step 1) is heated to 320°C through the pump P2 an...

Embodiment 2

[0074] Carry out according to the method in embodiment 1, difference is:

[0075] In step 1), the temperature of the first stage evaporator F1 is 115°C and the pressure is 130kPa; in step 2) the temperature of the second stage evaporator F2 is 350°C and the pressure is 130kPa; in step 3) the top temperature of the light ends column T1 It is 125 ℃, and side line production temperature is 195 ℃, and bottom temperature is 240 ℃, and pressure is 135kPa, and the plate number of light ends tower T1 is 55; In step 4), the top temperature of two oil mixing towers T2 is 220 ℃, Bottom temperature is 265 ℃, and pressure is 140kPa, and the plate number of two oil mixing towers T2 is 50; In step 5), the top temperature of heavy fraction tower T3 is 370 ℃, and bottom temperature is 600 ℃, and pressure is 145kPa, and heavy fraction The number of plates in column T3 is 55; in step 6), the temperature at the top of the anthracene oil column T4 is 325°C, the temperature at the bottom is 390°C, ...

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Abstract

The present invention provides a coal tar treatment method, which comprises: carrying out mixing heating on coal tar and a sodium carbonate solution, and conveying the obtained mixed solution to a first section evaporator to carry out dehydration, such that the tar component is discharged from the bottom; conveying the tar component into a second section evaporator to carry out distillation, such that a light fraction with a boiling point of lower than 300 DEG C is discharged from the top, and a heavy fraction containing anthracene oil and asphalt is discharged from the bottom; conveying the light fraction with a boiling point of lower than 300 DEG C into a light fraction tower to carry out rectification, wherein a light oil fraction is recovered from the top of the tower, a phenol oil fraction is recovered from the side stream, and a two oil mixing fraction is recovered from the bottom of the tower; conveying the two oil mixing fraction into a two oil mixing tower to carry out rectification, wherein a naphthalene oil fraction is recovered from the top of the tower, and a wash oil fraction is recovered from the bottom of the tower; conveying the heavy fraction containing anthracene oil and asphalt into a heavy fraction tower to carry out rectification, wherein an anthracene oil fraction is recovered from the top of the tower, and an asphalt fraction is recovered from the bottom of the tower; and conveying the anthracene oil fraction into an anthracene oil tower to carry out rectification, wherein an anthracene oil fraction 1 is recovered from the top of the tower, and an anthracene oil fraction 2 is recovered from the bottom of the tower. With the treatment method, energy source consumption is low, and a key component concentration degree is high.

Description

technical field [0001] The invention relates to a method for processing coal tar. Background technique [0002] Coal tar is a black or dark brown viscous liquid produced during dry distillation of coal. It is a complex mixture of highly aromatic hydrocarbons, most of which are polycyclic and condensed rings with or without side chains. Compounds and heterocyclic compounds containing oxygen, sulfur and chlorine, and contain a small amount of aliphatic hydrocarbons, cycloalkanes and unsaturated hydrocarbons. Coal tar contains more than 10,000 compounds. Although the composition of coal tar is extremely complex, its content in coal tar is very small for most components. The known components with a content greater than 1% are only 12 kinds, such as naphthalene, acenaphthene, fluorene, anthracene, phenanthrene, etc. Many components in coal tar are important raw materials for pesticides, pharmaceuticals, synthetic rubber, plastics and national defense industries, and some compou...

Claims

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Application Information

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IPC IPC(8): C10C1/06C10C1/08C10C1/12C10C1/16C10C1/14C10C1/00
Inventor 王立成罗继红何平
Owner CHINA PETROLEUM & CHEM CORP
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