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A coal tar fluidized bed-fixed bed combined process start-up method

A technology of fixed bed and ebullating bed, which is applied in the field of coal tar combined hydrogenation process, and can solve cumbersome problems

Active Publication Date: 2020-10-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the traditional sulfidation method of residual oil hydrogenation unit is still used in the early stage of sulfidation. After the sulfidation is completed, additional distillate oil and polar substances need to be selected, and at the same time, diluent oil is prepared according to a certain proportion, which is relatively cumbersome when the device is started.

Method used

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  • A coal tar fluidized bed-fixed bed combined process start-up method
  • A coal tar fluidized bed-fixed bed combined process start-up method
  • A coal tar fluidized bed-fixed bed combined process start-up method

Examples

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Embodiment 1

[0061]In Example 1, the medium and low temperature coal tar in Table 1 was used as the raw material, and the start-up method of the present invention was adopted. The properties of the medium and low temperature coal tar raw material are shown in Table 1. The ebullated bed hydrogenation device is provided with an ebullated bed hydrogenation reactor, and the ebullated bed hydrogenation reactor is filled with FEC catalyst, and the specific properties of the catalyst are shown in Table 3. The fixed-bed hydrogenation device is provided with two fixed-bed hydrogenation reactors, and the two fixed-bed hydrogenation reactors are connected in series, respectively filled with FMJ-2 and FMJ-3 catalysts, and the specific properties of the catalysts are shown in Table 4. The initial vulcanized oil of the fixed-bed hydrogenation reactor is straight-run kerosene, which is directly obtained by distillation of petroleum-based crude oil. The vulcanizing agent is DMDS. The maximum initial sulfur...

Embodiment 2

[0063] It is basically the same as Example 1, except that the raw material is high-temperature coal tar, and the specific properties are shown in Table 2. The specific starting operation conditions are different, and the specific starting operating conditions are shown in Table 5.

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Abstract

The invention discloses a coal tar boiling bed-fixed bed combination process starting method, which comprises that a fixed bed hydrogenation device is vulcanized, and the material obtained in the reaction process of the fixed bed hydrogenation device is used as the vulcanized oil for the starting process of a boiling bed hydrogenation device, such that the vulcanization processes of the two hydrogenation devices are organically combined into the integration to support each other, such that the problem of pipeline blockage in the starting process using the existing vulcanization process can besolved.

Description

technical field [0001] The invention relates to a start-up method of a coal tar hydrogenation process, in particular to a start-up method of a coal tar combined hydrogenation process. Background technique [0002] In the hydrogenation technology of heavy or full fractions of coal tar, petroleum fractions such as diesel or kerosene are usually used to vulcanize the catalyst when the unit is started, and then replaced with coal tar raw materials. Due to the high content of polycyclic aromatic hydrocarbons, colloids and asphaltenes in the heavy fraction or whole fraction of coal tar, the polarity of this substance is very different from the diesel oil used in the start-up, and the mutual solubility is poor, so coal tar is prone to occur during the raw material switching process during the start-up. The precipitation of medium-polar substances will block the raw material pump or pipeline, resulting in the failure of the normal operation of the device. In addition, the propertie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G65/02C10G49/04
Inventor 孟兆会陈新葛海龙贾永忠蒋立敬
Owner CHINA PETROLEUM & CHEM CORP