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Method for preparing high-cleanness fuel oil from intermediate-temperature and low-temperature coal tar

A technology for low-temperature coal tar and fuel oil, which is applied in the direction of tar processing through selective solvent extraction, can solve the problems of affecting the effect of hydrogenation catalysis, high energy consumption, and inability to produce condensed aromatic hydrocarbons, preventing poisoning, prolonging The effect of running cycle and avoiding bed clogging

Inactive Publication Date: 2012-11-14
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the first method removes bitumen cleanly, it consumes a lot of energy; the second method requires the use of an electric field, and although it is better for removing metal ions, it cannot remove polycyclic aromatic hydrocarbons well; the third method cannot remove condensed rings very well. Aromatics, affect the effect of hydrogenation catalysis

Method used

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  • Method for preparing high-cleanness fuel oil from intermediate-temperature and low-temperature coal tar
  • Method for preparing high-cleanness fuel oil from intermediate-temperature and low-temperature coal tar
  • Method for preparing high-cleanness fuel oil from intermediate-temperature and low-temperature coal tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The coal tar 1 of this example is a medium temperature coal tar, and its properties are shown in Table 1.

[0046] Its processing steps are as follows:

[0047] 1. Stir and mix the extraction

[0048] The extraction agent is industrial n-hexane, which is put into a solvent tank for use;

[0049] Use a filter to remove impurities from the coal tar 1, then pour the coal tar and the prepared extractant into a mixing tank at a volume ratio of 2:3, and stir and mix with a mixer for 40 minutes; the extraction temperature is 45°C.

[0050] 2. Static separation

[0051] Pour the stirred mixed liquid into the static tank, let it stand for separation for 50 minutes, pump the stratified upper layer light liquid into the light liquid buffer tank; pump the lower layer heavy liquid into the heavy liquid buffer tank.

[0052] 3. Recovery of light liquid extraction solvent

[0053] The light liquid is pumped into the evaporator, heated to 115°C with steam, the solvent is evaporated...

Embodiment 2

[0061] The coal tar 2 of this example is a low-temperature coal tar, and its properties are shown in Table 2;

[0062] Its processing steps are as follows:

[0063] 1. Stir and mix the extraction

[0064] The extraction solvent is chemical solvent 6# solvent oil, which is put into the solvent tank for use;

[0065] Use a filter to remove impurities from the coal tar 2, then pour the coal tar and the prepared extractant into a mixing tank at a ratio of 1:1 by volume, and stir and mix with a mixer for 30 minutes; the extraction temperature is 45°C.

[0066] 2. Static separation

[0067] Pour the stirred mixed liquid into the static tank, stand and separate for 50 minutes, pump the layered upper layer light liquid into the light liquid buffer tank; the lower layer heavy liquid into the heavy liquid buffer tank.

[0068] 3. Recovery of light liquid extraction solvent

[0069] Pump the light liquid into the evaporator, heat it with steam to 105°C, evaporate the solvent and reco...

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Abstract

The invention discloses a method for preparing high-cleanness fuel oil from intermediate-temperature and low-temperature coal tar, relating to the reprocessing technique of coal tar. The method comprises the following steps: stirring, mixing and extracting solvent and coal tar; standing; recovering the solvent through the evaporation of light liquid in the upper layer of the mixture to obtain theclean light fuel oil; and recovering the solvent through the evaporation of heavy liquid at the lower layer of the mixture to obtain the heavy fuel oil, wherein the solvent is recyclable after recovery. Having passed the pilot plant test and being operated for one year, the method of the invention is proven to be a technological method which has the advantages of simple process and low productionand operation costs and is capable of preparing high-cleanness fuel oil; the method of the invention is suitable for the process for pre-hydrotreating coal tar, and the high-cleanness fuel oil is prepared from intermediate-temperature and low-temperature coal tar in a solvent-extraction manner; the prepared fuel oil is a material of the process for the hydrogenation preparation of gasoline and diesel, and the prepared fuel oil is also available as component oil to be blended with residual oil to obtain 180CST marine fuel oil.

Description

technical field [0001] The invention relates to the technical field of coal tar reprocessing, in particular to a method for preparing high-clean fuel oil from medium-low temperature coal tar. technical background [0002] With the rapid development of my country's national economy, petroleum, as a non-renewable natural resource, is decreasing day by day, and petroleum has become one of the key factors restricting my country's economic development. [0003] Coal tar is a liquid product obtained during the dry distillation of coal, which is mainly organic matter composed of alkanes, aromatic hydrocarbons, colloids and asphalt. Coal tar is similar to petroleum in appearance, both are black viscous liquids, but the composition of coal tar is much more complex than that of petroleum. [0004] 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10C1/18
Inventor 孟广军曲延涛刘军海赵钢炜袁怡祥
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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