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Method for preparing clean fuel oil from coal tar

A technology for fuel oil and coal tar, applied in the field of coal tar preparation of clean fuel oil, can solve the problems of environmental pollution, environmental pollution, high nitrogen and sulfur content in oil products, and achieve the effects of low cost, energy saving and hydrogen resource saving

Inactive Publication Date: 2012-11-07
韩钊武
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned coal tar lightening to prepare fuel oil needs to be carried out under the conditions of high temperature and high pressure catalysts, which consumes a lot of energy and precious hydrogen resources, and will cause pollution to the environment
And under high temperature conditions, coal tar is easy to coke on the surface of the catalyst, causing the catalyst to lose its activity
The oil obtained by the above method contains high nitrogen and sulfur content, and the sulfur and nitrogen impurities contained in it will become SO during the combustion process. x , NO x seriously pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1, after mixing 500g of coal tar and 1500g of methanol, ultrasonically oscillate for 1 hour to obtain a mixed solution;

[0020] Step 2. Add the mixed solution obtained in step 1 into the high-pressure reactor, feed nitrogen into the reaction system at a constant pressure of 0.2Mpa to replace the air in the reactor, and replace 3 times, each ventilation time is 5min; replacement After completion, raise the temperature at a constant heating rate. When the temperature rises to 240°C, pass in an inert gas to keep the pressure at 20MPa; keep constant temperature and pressure and stir, solvent extract the fuel oil components in the coal tar, and stop heating after the extraction is completed;

[0021] Step 3. Cool the reaction system in step 2 to room temperature while reducing the pressure in the reactor; filter the solution and add it to a vacuum rotary evaporator to evaporate methanol at -0.01MPa and 20°C until there is no liquid Evaporated, the liquid that has not b...

Embodiment 2

[0024] Step 1: Mix 500g of coal tar and 2000g of ethanol and then ultrasonically vibrate for 1 hour to obtain a mixed solution;

[0025] Step 2. Add the mixed solution obtained in step 1 into the high-pressure reactor, feed nitrogen into the reaction system at a constant pressure of 0.2Mpa to replace the air in the reactor, and replace 3 times, each ventilation time is 5min; replacement After completion, raise the temperature at a constant heating rate. When the temperature rises to 350°C, feed an inert gas to keep the pressure at 10MPa; keep constant temperature and pressure and stir, solvent extract the fuel oil components in the coal tar, and stop heating after the extraction is completed;

[0026] Step 3. Cool the reaction system in step 2 to room temperature while reducing the pressure in the reactor; filter the solution and add it to a vacuum rotary evaporator, evaporate the solvent at -0.1MPa, 50°C until there is no liquid Evaporated, the liquid that has not been evapor...

Embodiment 3

[0029] Step 1: Mix 5kg of coal tar and 20kg of toluene and then oscillate ultrasonically for 1 hour to obtain a mixed solution;

[0030] Step 2. Add the mixed solution obtained in step 1 into the high-pressure reactor, feed nitrogen into the reaction system at a constant pressure of 0.2Mpa to replace the air in the reactor, and replace 3 times, each ventilation time is 5min; replacement After completion, the temperature is raised at a constant heating rate, and when the temperature is raised to 300°C, an inert gas is introduced to keep the pressure at 15MPa; keep constant temperature and pressure and stir, solvent extracts the fuel oil component in the coal tar, and stops heating after the extraction is completed;

[0031] Step 3. Cool the reaction system in Step 2 to room temperature while reducing the pressure in the reactor; filter the solution and add it to a vacuum rotary evaporator, evaporate the solvent at -0.05MPa, 30°C until there is no liquid Evaporated, the liquid t...

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Abstract

The invention relates to a method for preparing clean fuel oil from coal tar, belonging to the field of coal tar reprocessing. The method comprises the following steps: mixing coal tar and a specific solvent, holding the mixture in a high-pressure autoclave at constant temperature for several hours, cooling to room temperature, separating the reaction liquid, and extracting to obtain the fuel oil. In the coal tar supercritical extraction process, the solvent has the functions of both extraction and hydrogenation, and the coal tar is lightened under the condition of no need of high-temperaturehigh-pressure catalyst, thereby saving abundant energy sources and hydrogen resources.

Description

technical field [0001] The invention relates to a method for preparing clean fuel oil from coal tar, which belongs to the field of coal tar reprocessing. Background technique [0002] There are many mature processes and methods at home and abroad for processing coal tar to produce fuel oil, mainly including distillation separation method, extraction separation method and so on. Coal tar distillation is a relatively traditional process, which can cut out various distillate oils very well. After distillation to 360°C, what is left is asphalt, but it consumes a lot of energy, and the raw material needs to be heated to 360-380°C. Some long-chain alkanes could not be separated. Chinese patent CN101781575A discloses a method for producing high-clean fuel oil from medium-low temperature coal tar. It is to stir and mix solvent and coal tar for extraction. After the heavy liquid in the lower layer is evaporated to recover the solvent, heavy fuel oil is obtained. Chinese patent CN1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C1/18
Inventor 韩钊武
Owner 韩钊武
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