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A kind of method of coal tar fixed bed hydrotreating co-production refining soft pitch

A hydrorefining reaction and coal tar technology, which is applied in tar processing, tar processing by distillation, tar pitch/petroleum pitch/natural pitch by distillation, etc., can solve the problems of high investment, energy consumption and cost, and achieve Good solubility, low process energy consumption, high content of aromatics and saturated hydrocarbons

Active Publication Date: 2017-05-24
程志宇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides a method for coal tar fixed bed hydrogenation co-production of refined soft pitch, which mainly solves the problem of high investment, energy consumption and cost in the existing centrifugation, sedimentation treatment technology or hydrogenation treatment technology for refining coal tar pitch technical problem

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  • A kind of method of coal tar fixed bed hydrotreating co-production refining soft pitch

Examples

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Effect test

Embodiment 1

[0036] A method for coal tar fixed-bed hydrogenation co-production of refined soft pitch, the processing steps are as follows:

[0037] (a) Low-temperature coal tar in the raw material (properties are shown in Table 1) is mixed with the heavy refined oil returned in the subsequent steps after preheating, enters the raw material heating furnace for heating, and then enters the vacuum fractionation tower for vacuum fractionation to obtain light distillate oil and For heavy distillates, the cut point of vacuum fractionation is 420°C;

[0038] (b) The light distillate oil obtained in step (a) enters the fixed-bed hydrofinishing unit, contacts with the hydrofinishing catalyst in the presence of hydrogen, and carries out the hydrofinishing reaction. The hydrofinishing reaction conditions are: reaction temperature 270° C., pressure 12.0MPa, hydrogen oil volume ratio 1200:1, volume space velocity 1hr - ;

[0039] (c) The hydrorefining reaction product obtained in step (b) is separat...

Embodiment 2

[0044] A method for coal tar fixed-bed hydrogenation co-production of refined soft pitch, the processing steps are as follows:

[0045] (a) Raw material high-temperature coal tar (see Table 2 for properties) is mixed with the heavy refined oil returned in the subsequent steps after preheating, enters the raw material heating furnace for heating, and then enters the vacuum fractionation tower for vacuum fractionation to obtain light distillate oil and heavy oil For distillate oil, the cut point of vacuum fractionation is 400°C;

[0046] (b) The light distillate oil obtained in step (a) enters the fixed-bed hydrofinishing unit, contacts with the hydrofinishing catalyst in the presence of hydrogen, and carries out the hydrofinishing reaction. The hydrofinishing reaction conditions are: reaction temperature 290° C., pressure 13.0MPa, hydrogen oil volume ratio 1200:1, volume space velocity 0.8hr - ;

[0047] (c) The hydrorefining reaction product obtained in step (b) is separated...

Embodiment 4

[0050] The indicators of the refined soft asphalt obtained in Example 4 are shown in Table 6.

[0051] Table 1: Properties of medium and low temperature coal tar as raw material

[0052] project data Density(20℃),g / cm 3

[0053] Viscosity(100℃),mm 2 / s -1

[0054] Table 2: Raw material high temperature coal tar properties table

[0055] project data Density(20℃),g / cm 3

[0056] 90％ 542 EBP / Viscosity(100℃),mm 2 / s -1

[0057] Table 3: Properties of Heavy Refined Oil in Example 1

[0058] project data Density(20℃),g / cm 3

[0059] Ni,μg / g <0.1

[0060] Table 4: Example 2 Heavy Refined Oil Property Table

[0061] project data Density(20℃),g / cm 3

[0062] Table 5: Table of properties of refined soft asphalt in Example 1

[0063] project data Density(20℃),g / cm 3

[0064] Ash, wt% 0.003 S,wt% <0.02

[0065] Table 6: Tabl...

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Abstract

The invention relates to the fields of petroleum and chemicals and especially relates to a method for the co-production of refined maltha through the fixed bed-based coal-tar hydrogenation process. According to the method, the coal tar, adopted as the raw material, is preheated and then is mixed with the heavy refined oil returned through the follow-up procedure. After that, the obtained mixture is heated in a raw material heating furnace and then is fractionated in a vacuum fractionate tower to obtain a light distillate oil and a heavy distillate oil. The light distillate oil is subjected to hydrofinishing and fractionating to obtain a light component and the heavy refined oil. The light component serves as a product to be delivered out of a factory. The heavy refined oil is returned to be mixed with the coal tar as the raw material. The heavy distillate oil, obtained at the bottom of the vacuum fractionate tower, is subjected to the treatments of pressurizing, filtering and heating in the heating furnace to be fed into a distillation column. A distillated light component is the refined maltha.

Description

technical field [0001] The invention relates to the fields of petroleum and chemical industry, in particular to a method for coal tar fixed-bed hydrogenation co-production of refined soft asphalt. Background technique [0002] Coal tar is a liquid product produced during the pyrolysis process of coal. Its aromatic content, colloid content, asphaltene content and mechanical impurity content are high, and coal tar also has a high degree of unsaturation, and it is easy to polycondensate at high temperature. focal characteristics. [0003] Coal tar is subjected to high-temperature fractionation under negative pressure conditions, and the obtained light distillate oil is contacted with a fixed-bed hydrogenation catalyst for hydrogenation treatment to perform desulfurization, denitrogenation, deoxidation, degumming, demetallization, double bond hydrocarbon saturation and Selective ring opening and other reactions, the product after hydrogenation has the characteristics of low imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10C3/02C10C3/06C10C1/14C10C1/04C10C1/20C10C1/00C10G67/00
CPCC10C1/00C10C1/04C10C1/14C10C1/205C10C3/06C10G67/00
Inventor 程志宇宋建菊
Owner 程志宇
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