Online extraction and dephenolization method of coal tar wastewater

A technology for coal tar and dephenolization, applied in chemical instruments and methods, water pollutants, multi-stage treatment of water/sewage, etc. The effect of eliminating secondary pollution, simplifying process steps and reducing investment

Active Publication Date: 2015-12-16
王庆元
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an online extraction and dephenolization method of coal tar wastewater, which solves the problems of high cost, high energy consumption, complicated process and insufficient consideration of the value-added utilization of the extraction agent due to pollution efficiency deterioration in the existing extraction and dephenolization method

Method used

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  • Online extraction and dephenolization method of coal tar wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] On-line extraction and dephenolization of coal tar wastewater includes the following steps:

[0038] Step 1, coal tar heating and decompression flash evaporation:

[0039] Transport the hydrated coal tar to the coal tar storage tank. In order to prevent the coal tar oil from delamination, the coal tar storage tank should be equipped with a stirring device and stirred regularly. For the water that is clearly stratified in the upper part of the tank, it is discharged to the coal tar oil water storage tank through the water cutout. The water in the oil-water storage tank is mixed with coal tar before being pumped into the heat exchanger during normal production. Heat the water-containing coal tar through a heat exchanger until it reaches 120°C, and then enters the coal tar decompression flash tank. Vaporize, release the mixed steam.

[0040] Step 2, online extraction and dephenolization:

[0041] The mixed steam is sent to the middle and upper part of the rectification...

Embodiment 2

[0043] On-line extraction and dephenolization of coal tar wastewater includes the following steps:

[0044] Step 1, coal tar heating and decompression flash evaporation:

[0045] Transport the water-containing coal tar to the coal tar storage tank. In order to prevent the coal tar oil from delamination, the coal tar storage tank should be equipped with a high stirring device and stirred regularly. For the water that is clearly stratified in the upper part of the tank, it is discharged to the coal tar oil water storage tank through the water cutout. The water in the oil-water storage tank is mixed with coal tar before being pumped into the heat exchanger during normal production. Heat the water-containing coal tar through a heat exchanger until it reaches 180°C, and then enters the coal tar decompression flash tank. Vaporization, release the mixed steam.

[0046] Step 2, online extraction and dephenolization:

[0047] The mixed steam is sent to the middle and upper part of ...

Embodiment 3

[0049] On-line extraction and dephenolization of coal tar wastewater includes the following steps:

[0050] Step 1, coal tar heating and decompression flash evaporation:

[0051] Transport the water-containing coal tar to the coal tar storage tank. In order to prevent the coal tar oil from delamination, the coal tar storage tank should be equipped with a high stirring device and stirred regularly. For the water that is clearly stratified in the upper part of the tank, it is discharged to the coal tar oil water storage tank through the water cutout. The water in the oil-water storage tank is mixed with coal tar before being pumped into the heat exchanger during normal production. Heat the water-containing coal tar through a heat exchanger until it reaches 150°C, and then enters the coal tar decompression flash tank. Vaporization, release the mixed steam.

[0052] Step 2, online extraction and dephenolization:

[0053] The mixed steam is sent to the middle and upper part of ...

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Abstract

The invention discloses an online extraction and dephenolization method of coal tar wastewater. The method comprises the following steps: heating water-containing coal tar, carrying out reduced pressure flash evaporation to obtain mixed steam, sending the mixed steam to a rectifying tower, introducing an extractant from the top of the tower as a reflux liquid, carrying out azeotropic rectification in the rectifying tower, extracting components with the boiling point of 170-210DEG C from the lateral line of the rectifying tower, fractioning components with the boiling point being greater than 210DEG C, allowing the components with the boiling point being greater than 210DEG C to heavy oil components in the middle portion of the tower, and extracting other components from the top of the tower; sending the components extracted from the top of the tower to a tower top condenser, cooling to a temperature being smaller than 40DEG C, sending the cooled components to a tower top refluxing tank, carrying out oil-water settlement separation, and separating to obtain water which is dephenolized water; and mixing oil obtained after the separation with the component extracted from the lateral line, sending the obtained mixture to a dephenolization device, and dephenolizing. The method directly realizes online extraction dephenolization in the rectifying tower in the coal tar rectification process, simultaneously realizes coal tar rectification and phenol substance removal purposes, and saves the cost.

Description

technical field [0001] The invention belongs to the technical field of coal tar production, in particular to an online extraction and dephenolization method of coal tar wastewater. Background technique [0002] Phenolic compounds contained in coal tar are important chemical raw materials and high value-added products, which can be used to manufacture dyes, medicines, resins, adhesives, preservatives, etc. At the same time, phenol is a highly toxic substance in the protoplasm, which has a poisonous effect on all organisms and is difficult to degrade. If phenol enters wastewater, it will cause serious water pollution. Currently, phenol-containing wastewater is listed as a key solution in my country's water pollution control. One of the harmful wastewater. The solubility of phenol in water is very high, and the waste water produced during coal tar processing contains a large amount of phenol, and its content can reach 10,000-20,000 mg / L. The effective recovery of these phenolic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/34
Inventor 王庆元
Owner 王庆元
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