Method for preparing fuel oil with coal oil hydrogenation

A technology for coal tar and fuel oil, which is used in hydrotreating process, petroleum industry, processing of hydrocarbon oil, etc., can solve the problems that cannot be directly used as a product, affects the activity and stability of hydrocracking catalyst, and has high content of aromatics in diesel oil. The effect of cost-effective reforming reactions

Active Publication Date: 2008-10-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used hydrocracking catalysts usually require the content of sulfur and nitrogen impurities in the feed, especially the requirement for nitrogen is preferably below 100 μg / g, otherwise it will affect the activity and stability of the hydrocracking catalyst, and the coal tar The impurity content of sulfur, nitrogen and oxygen is very high, and the nitrogen-containing compounds that are difficult to remove are concentrated in the heavy fraction used as hydrocracking feed. Under conventional hydrotreating catalysts and hydrogenation conditions, it is difficult to make Nitrogen content in heavy ends meets feed requirements for hydrocracking
In addition, the diesel produced from coal tar produced by this process has high aromatic content and low cetane number, so it cannot be directly used as a product

Method used

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  • Method for preparing fuel oil with coal oil hydrogenation
  • Method for preparing fuel oil with coal oil hydrogenation
  • Method for preparing fuel oil with coal oil hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0031] The examples 1-5 show the effect of using the first method to upgrade diesel oil.

[0032] The raw material oil used in the embodiment is heavy tar, and its properties are shown in Table 1. (wherein wt% is weight percent)

[0033] Table 1 Raw Oil Properties

[0034] Raw oil

1#

2#

Density, g / cm 3

1.10

1.16

Distillation range / ℃

190～420

250～600

Carbon residue, wt%

0.2

2.8

Sulfur content, wt%

0.49

0.52

Nitrogen content, wt%

0.99

1.11

Metal content, μg g -1

33.0

20.0

Oxygen content, wt%

1.3

2.0

Aromatic content, wt%

100.0

100.0

[0035] exist figure 1 On the basis of the process flow, the hydro-upgrading reaction part is added, and the details are as follows: a set of separation system is used for hydro-refining and hydro-refining / cracking, and the diesel fraction 11 separated from the fracti...

Embodiment 6～8

[0047] This example shows the effect of using the second method to upgrade diesel oil.

[0048] exist figure 1 On the basis of the flow process, a hydro-upgrading reactor is added, as follows: hydro-refining and hydro-refining / cracking adopt a set of separation system, which includes a gas-liquid separator 5 and a fractionation tower 8, and the liquid separated by the separator 5 The phase-generated oil enters the hydro-upgrading reactor, and the hydro-upgrading product enters the fractionation tower 8, and is fractionated to obtain naphtha 10, diesel oil 11, and heavy fraction 16, and the heavy fraction 16 enters the hydrotreating / cracking reactor. The resulting light fractions of different distillation ranges, process conditions and product properties are shown in Table 3. Wherein embodiment 6, embodiment 7 and the catalyst that the raw material that embodiment 6, embodiment 7 and embodiment 8 adopt, hydrorefining reactor and hydrorefining / cracking reactor are used and oper...

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Abstract

The invention discloses a method for producing fuel oil from coal tar by hydrogenating and converting heavy aromatics to light ones. The method adopting the process of combining hydro-refining with hydro-refining/cracking comprises the following steps: mixing coal tar with hydrogen and entering a hydro-refining reaction area, separating the refined effluent by a separation system to obtain naphtha, diesel and heavy fraction, feeding the heavy fraction into a hydro-refining/cracking reaction area, and adding all of the effluent obtained in the hydro-refining/cracking reaction area to the separation system. The nitrogen content in the heavy fraction as feeding material for hydro-cracking can suppress the activity of the cracking catalyst, so that the heavy fraction is subjected to hydro-refining to reduce the nitrogen content before contacting with the hydro-cracking catalyst, thus fully exerting the activity of the cracking catalyst, facilitating the conversion of large molecules into light ones, improving yield of the light-weight fuel oil and prolonging the running cycle of the device.

Description

technical field [0001] The invention relates to a method for producing high-quality fuel oil by hydrogenating coal tar. Coal tar is used as a raw material to produce high-quality light fuel oil by hydrofining-hydrofining / cracking. Background technique [0002] The increasing scarcity of the world's petroleum resources has made the technology of processing various unconventional petroleum resources to produce light fuel oil a hot topic, one of which is to produce clean fuels from coal-based raw materials. [0003] Coal tar is a by-product of coking technology. Its composition is mainly aromatic hydrocarbons, and the content of sulfur, nitrogen, oxygen and other impurities is high. It needs further processing to produce light fuel oil. [0004] It has been reported to process coal tar or some of its fractions to produce light fuel oil by hydrogenation. For example, CN1351130A introduces a method for producing diesel oil by hydrogenation of coal tar. The method is to distill t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/12
Inventor 方向晨许杰刘平张忠清王立言
Owner CHINA PETROLEUM & CHEM CORP
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