Two-stage slurry bed hydrogenation process of medium and low temperature coal tar

A low-temperature coal tar and slurry bed technology, applied in the field of coal chemical industry, can solve the problems of low liquid fuel yield, high hydrogen consumption, and low cetane number content, so as to avoid the rapid rise of pressure drop and improve hydrogenation conversion The effect of high rate and product yield

Active Publication Date: 2015-01-14
任相坤
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above-mentioned technology first carries out vacuum or atmospheric pressure distillation to the whole fraction of coal tar, and then separately hydrotreats the obtained light fraction and heavy fraction, but in the above-mentioned technology, when the heavy fraction is carried out catalytic hydrogenation , and dilute the heavy distillate oil with diluent oil first, and then use fixed bed hydrofining for the diluted heavy distillate oil, and the existence of diluent oil will also lead to an increase in hydrogen consumption during the hydrofinishing process, resulting in Waste of resources will also affect the yield of liquid fuels produced by hydrogenation o

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  • Two-stage slurry bed hydrogenation process of medium and low temperature coal tar
  • Two-stage slurry bed hydrogenation process of medium and low temperature coal tar
  • Two-stage slurry bed hydrogenation process of medium and low temperature coal tar

Examples

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Example Embodiment

[0030] Example 1

[0031] (1) The medium and low temperature coal tar is dehydrated and purified to remove impurities in the purification treatment equipment, and the water content of the medium and low temperature coal tar after dehydration is less than 0.5wt%;

[0032] (2) Atmospheric distillation of the medium and low temperature coal tar purified in the step (1), cutting into light oil fractions and heavy oil fractions, the temperature range of the cutting point is 320°C;

[0033] (3) Combine the heavy oil fraction higher than the cut point of 320°C in the step (2) with the hydrocracking catalyst, H 2 mixed, wherein the hydrocracking catalyst is a nanoscale material, its composition is 50wt% α-FeOOH, and the balance is γ-Al 2 o 3 , after mixing evenly, enter the first-stage slurry bed and the second-stage slurry bed in turn for two-stage hydrocracking reaction. The conditions of the hydrocracking reaction are as follows: the reaction temperature of the first-stage slurry...

Example Embodiment

[0035] Example 2

[0036] (1) The medium and low temperature coal tar is dehydrated and purified to remove impurities in the purification treatment equipment, and the water content of the medium and low temperature coal tar after dehydration is less than 0.5wt%;

[0037] (2) Distilling the medium and low temperature coal tar purified in the step (1) under reduced pressure, cutting it into light oil fractions and heavy oil fractions, and the cutting point is 340°C;

[0038] (3) Combine the heavy oil fraction higher than the cut point of 340°C in the step (2) with the hydrocracking catalyst, H 2 mixing, wherein the hydrocracking catalyst is a nano-scale material, and its composition is 25wt%MoO 3 , 5wt%NiO, the balance is γ-Al 2 o 3 , after mixing evenly, enter the first-stage slurry bed and the second-stage slurry bed in turn for two-stage hydrocracking reaction. The conditions of the hydrocracking reaction are as follows: the reaction temperature of the first-stage slurry b...

Example Embodiment

[0041] Example 3

[0042] (1) In the purification treatment equipment, the mixture of medium and low temperature coal tar and residue oil is dehydrated and purified, and the residue oil is selected as a mixture of high sulfur heavy residue oil and high heavy metal content heavy residue oil. The mass ratio of medium and low temperature coal tar, high-sulfur heavy residue oil, and high heavy metal content heavy residue oil is 5:0.5:0.5, and the water content of the dehydrated mixture is less than 0.5wt%;

[0043] (2) Distilling the medium-low temperature coal tar purified in the step (1) under reduced pressure, cutting it into light oil fractions and heavy oil fractions, and the cutting point is 360°C;

[0044] (3) Preheating the heavy oil fraction higher than the cut point of 360°C in the step (2) at 100°C, and then reacting with hydrocracking catalyst, H 2 mixed, wherein the hydrocracking catalyst is a nano-scale material, and its composition is 5wt%NiO, 30wt%WO 3 The balanc...

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Abstract

The invention provides a two-stage slurry bed hydrogenation process of medium and low temperature coal tar, and the a two-stage slurry bed hydrogenation process comprises the following steps: (1) performing purification on the medium and low temperature coal tar; (2) performing decompression or atmospheric distillation on the medium and low temperature coal tar purified by the step (1) for cutting into light oil fractions and heavy oil fractions, wherein the cutting point temperature range is 320 to 380 DEG; (3) mixing the heavy oil fractions higher than the cutting point of the step (2) with a hydrocracking catalyst and H2, mixing evenly, and in turn getting into a first stage slurry bed and a second slurry bed for two-stage hydrocracking reaction, processing the prepared hydrocracking products by fractionation, performing fractional distillation on the hydrocracking products by the cutting point temperature range in the step (2) to distil off fractions lower than the cutting point; discharging 3-8% fractions higher than 540 DEG C out, and recycling the rest fractions back to a first stage slurry bed reactor. A liquid fuel prepared by the process has the advantages of low hydrogen consumption and high product yield.

Description

technical field [0001] The invention relates to a two-stage slurry bed hydrogenation process for medium and low temperature coal tar, which belongs to the technical field of coal chemical industry. Background technique [0002] Liquid fuels play an important role in various energy sources. Various vehicles, ships, airplanes, construction machinery and other means of transportation all use liquid fuels in large quantities. Liquid fuels are mainly derived from petroleum extracted from the ground. In recent years, with the depletion of world oil resources and the continuous deepening of my country's energy crisis, it has become an urgent task for our country to find reasonable and economical alternative energy sources and change the energy consumption structure. [0003] With the rapid development of my country's steel and coal chemical industries, the output of coal tar is increasing, and the effective utilization of coal tar is becoming more and more important. With coal t...

Claims

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Application Information

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IPC IPC(8): C10G69/00
CPCC10G69/00
Inventor 井口宪二坂脇弘二
Owner 任相坤
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