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Method for preparing fuel oil from coal tar

A technology of fuel oil and coal tar, which is applied in the field of coal chemical industry, can solve the problems of reducing the rate of hydrogenation reaction and cracking, the quality fraction of crude products is complex, and the time of hydrogenation reaction is long, so as to promote hydrogenation reaction and cracking reaction, The effect of shortening the production time and increasing the catalytic reaction temperature

Pending Publication Date: 2021-10-22
广元市天森煤化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the preparation of fuel oil from coal tar, it generally takes 2-3 times of fractionation and hydrogenation reactions to prepare diesel and gasoline of the finished product number; and because the quality fraction of the crude product obtained in the first reaction is complex, the 2-3 times The hydrogenation reaction time is longer
Publication No. CN 102477310 A discloses a method for hydrogenating coal tar to produce fuel oil, in which specific nano-Al 2 o 3 Carrier catalyst, one-step reaction through specific temperature, pressure and gas flow, but the reaction temperature is 345-390 ° C, which is relatively low, which reduces the rate of hydrogenation reaction and cracking, and reduces production efficiency
Simultaneously, the fuel oil product obtained by the one-time hydrogenation reaction of the method is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing fuel oil from coal tar, comprising the following steps:

[0024] (1) The raw material of the whole distillate of coal tar is dehydrated and removed from mechanical impurities for subsequent use;

[0025] (2) Coal tar is put into the reactor, then the catalyst is added to the reactor and mixed uniformly; the addition of the catalyst is 1wt% of the coal tar;

[0026] (3) Hydrogen is passed into the reactor in step (2) to make hydrogen and mixture fully contact reaction; Wherein the volume ratio of hydrogen and coal tar fraction is 850, and reaction temperature is 460 ℃, and reaction pressure is 8MPa, and space velocity is 0.8h -1 , react under the action of a catalyst to obtain a gas phase product and a liquid phase product, and the gas phase product and the liquid phase product are separated respectively;

[0027] (4) The liquid phase product is subjected to atmospheric fractionation in an atmospheric fractionation tower to obtain the crude produ...

Embodiment 2

[0034] A method for preparing fuel oil from coal tar, comprising the following steps:

[0035] (1) The raw material of the whole distillate of coal tar is dehydrated and removed from mechanical impurities for subsequent use;

[0036] (2) Coal tar is put into the reactor, then the catalyst is added to the reactor and mixed uniformly; the addition of the catalyst is 5wt% of the coal tar;

[0037] (3) Hydrogen is passed into the reactor in step (2) to make hydrogen and mixture fully contact reaction; Wherein the volume ratio of hydrogen and coal tar fraction is 1000, and reaction temperature is 440 ℃, and reaction pressure is 8MPa, and space velocity is 0.8h -1 , react under the action of a catalyst to obtain a gas phase product and a liquid phase product, and the gas phase product and the liquid phase product are separated respectively;

[0038] (4) The liquid phase product is subjected to atmospheric fractionation in an atmospheric fractionation tower to obtain the crude prod...

Embodiment 3

[0045] A method for preparing fuel oil from coal tar, comprising the following steps:

[0046] (1) The raw material of the whole distillate of coal tar is dehydrated and removed from mechanical impurities for subsequent use;

[0047] (2) Coal tar is put into the reactor, then the catalyst is added to the reactor and mixed uniformly; the addition of the catalyst is 3.5wt% of the coal tar

[0048] (3) Hydrogen is passed into the reactor in step (2) to make hydrogen and mixture fully contact reaction; Wherein the volume ratio of hydrogen and coal tar fraction is 900, and reaction temperature is 420 ℃, and reaction pressure is 8MPa, and space velocity is 0.8h -1 , react under the action of a catalyst to obtain a gas phase product and a liquid phase product, and the gas phase product and the liquid phase product are separated respectively;

[0049] (4) The liquid phase product is subjected to atmospheric fractionation in an atmospheric fractionation tower to obtain the crude prod...

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Abstract

The invention discloses a method for preparing fuel oil from coal tar, and belongs to the field of coal chemical industry. The method includes the following steps: dehydrating a coal tar full-fraction raw material, removing mechanical impurities, mixing with a catalyst, introducing hydrogen, and carrying out two catalytic reactions to obtain the high-quality fuel oil. According to the method, high-quality diesel oil and gasoline are obtained through a two-step catalytic reaction system. By adding the specific catalyst, impurities such as S, N and O in the coal tar fraction can be removed during the first-step catalytic reaction, and aromatic hydrocarbon can be saturated or isomerized; and thereby, the content of aromatic hydrocarbon in the crude fuel oil is reduced; meanwhile, the content of light oil in the crude fuel oil is increased, so that the second-step catalytic reaction is more time-saving and energy-saving, and the quality of the fuel oil is improved. The whole process production time is shortened, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a method for preparing fuel by hydrogenating coal tar. Background technique [0002] my country is rich in coal resources, and it has become a trend to produce fuel oil from coal. Coal tar, a by-product of the coal chemical process, can also be used to produce fuel oil. Generally speaking, coal tar is produced by carbonization of coal, which is divided into low-temperature carbonization, medium-temperature carbonization and high-temperature carbonization. Among them, the yield of coal tar in low-temperature carbonization of coal is the highest, and coal suitable for low-temperature carbonization is non-caking. Non-coking coal, such as lignite or highly volatile bituminous coal, is abundant in reserves and is the basis for low-temperature carbonization to produce coal tar, as well as fuel oil and diesel. The low-temperature dry distillation process is much simpler than coal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/14B01J23/888
CPCC10G67/14B01J23/8885B01J23/002C10G2300/202C10G2400/02C10G2400/04B01J2523/00B01J35/23B01J2523/31B01J2523/68B01J2523/69B01J2523/845B01J2523/847
Inventor 石怀强
Owner 广元市天森煤化有限公司
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