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A kind of coal tar hydrogenation treatment method

A technology for hydrotreating and coal tar, which is applied in the fields of coal tar treatment and coal tar hydrotreating, can solve problems such as low overall utilization rate of resources, improve solid sedimentation speed and separation efficiency, improve overall temperature, and high aromatics content. Effect

Active Publication Date: 2021-07-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the present invention provides a coal tar hydrotreating method, which can convert heavy components in coal tar into high-value light products while efficiently recovering phenol oil and naphthalene oil components, and achieve long-term stable operation of the device, which solves the problem of low overall utilization of resources in the existing coal tar treatment methods

Method used

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  • A kind of coal tar hydrogenation treatment method
  • A kind of coal tar hydrogenation treatment method
  • A kind of coal tar hydrogenation treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0044] In Example 1, the cutting and separation of different fractions of coal tar raw materials is realized by using supercritical extraction technology, wherein supercritical extraction uses CO 2 It is the extraction agent, the extraction ratio (extraction agent to raw material ratio) is 0.2, the extraction temperature is 195°C, and the extraction pressure is 8.5MPa; the auxiliary agent is catalytic oil slurry, and the weight of catalytic oil slurry is the heavy component of coal tar (distillate oil greater than 230°C) and 10% of the weight of the mixed oil of dephenolized oil and denaphthalene oil; crude phenol is purified by alkali washing method, with Na 2 CO 3 As the alkali used in alkaline washing, crude phenol and Na 2 CO 3 The mass ratio is 1:1; the crude naphthalene is purified by double-furnace double-tower continuous rectification; the blended components enter the ebullated bed reactor for hydrogenation reaction, hydrogenation reaction conditions: reaction temper...

Embodiment 2

[0046] In Example 2, the cutting and separation of different fractions of coal tar raw materials is realized by using supercritical extraction technology, wherein supercritical extraction uses CO 2 It is the extraction agent, the extraction ratio is 0.5, the extraction temperature is 215°C, and the extraction pressure is 11.5Mpa; the auxiliary agent is catalytic oil slurry, and the weight of the catalytic oil slurry is 30% of the weight of the heavy component of coal tar and the mixed oil of dephenolized oil and denaphthalene oil; Crude phenol was purified by alkaline washing, using Na 2 CO 3 As the alkali used in alkaline washing, crude phenol and Na 2 CO 3 The mass ratio is 1:1.2; the crude naphthalene is purified by continuous rectification with double furnaces and double towers; the blended components enter the ebullated bed reactor for hydrogenation reaction, hydrogenation reaction conditions: reaction temperature 360 ​​° C, reaction pressure 10 MPa, hydrogen oil volume...

Embodiment 3

[0048] In Example 3, with CO 2 It is the extraction agent, the extraction ratio is 0.8, the extraction temperature is 235°C, and the extraction pressure is 13.5Mpa; the auxiliary agent is catalytic oil slurry, and the weight of the catalytic oil slurry is 40% of the weight of the heavy component of high-temperature coal tar and the mixed oil of dephenolized oil and denaphthalene oil ; Crude phenol is purified by alkali washing method, with Na 2 CO 3 As the alkali used in alkaline washing, crude phenol and Na 2 CO 3 The mass ratio is 1:1.3; crude naphthalene is purified by continuous rectification with double furnaces and double towers; the blended components enter the ebullated bed reactor for hydrogenation reaction, hydrogenation reaction conditions: reaction temperature 370°C, reaction pressure 11MPa, hydrogen to oil volume ratio 600, volumetric space velocity 1h -1 ;The reconciliation of coal tar and the circulating oil of the hot high-fraction oil produced by the ebull...

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Abstract

The invention discloses a coal tar hydrogenation treatment method. The method comprises the following steps: coal tar is fractionated first to obtain distillate oil below 210°C, distillate oil at 210-230°C and distillate oil above 230°C; the distillate oil below 210°C is subjected to dephenolization treatment Obtain dephenolized oil and crude phenol; 210‑230°C distillate oil is subjected to denaphthalene treatment to obtain denaphthalene oil and crude naphthalene; distillate oil above 230°C, dephenolized oil, denaphthalene oil and additives enter the pretreatment tank for mixing, mixing After uniformity, the insoluble matter is separated to obtain the blending component A, and the obtained blending component A enters the ebullated bed hydrogenation reaction unit for reaction, and the obtained hydrogenation reaction effluent is subjected to gas-liquid separation to obtain a gas phase material and a liquid phase material, wherein Part of the liquid phase material is recycled back to the pretreatment tank; the remaining part of the liquid phase material is fractionated to obtain light components, middle components and tail oil components. The method of the invention can efficiently recover phenol oil and naphthalene oil, and at the same time, convert heavy components in coal tar into high-value light components, and realize long-term stable operation of the device.

Description

technical field [0001] The invention belongs to the field of oil refining, and relates to a coal tar treatment method, in particular to a coal tar hydrogenation treatment method. Background technique [0002] High-temperature coal tar is one of the main secondary chemical products recovered from coking gas. It is rich in unique aromatic compounds and is a valuable chemical resource. In the existing distillation and separation process, the yield of coal tar pitch is as high as 55%, and the outlet of coal tar pitch has always been the bottleneck problem restricting the development of coal tar processing industry. Its low price seriously affects the economic benefits of tar processing enterprises, forcing a large amount of coal tar, especially high-temperature coal tar with high coal tar pitch content, to be directly burned as fuel, resulting in the inability to effectively utilize the unique chemical raw materials of coal tar. [0003] In addition to the characteristics of re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/14
CPCC10G67/14C10G2300/4006C10G2300/4012
Inventor 孟兆会陈博刘玲杨涛朱慧红其他发明人请求不公开姓名
Owner CHINA PETROLEUM & CHEM CORP