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Hydrogenation method for coal tar combination bed and system used for coal tar combination bed hydrogenation

A technology of coal tar and combined bed, which is applied to the hydrogenation system of coal tar combined bed and the field of hydrogenation of coal tar combined bed, which can solve the problems of coke clogging the internal components of the reactor and the inability to operate stably for a long period, so as to improve the utilization rate and utilization value, prolonging the operation period of the device, and improving the effect of liquid yield

Active Publication Date: 2018-01-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the method of the above prior art is easy to coke to generate coke or deposits to block the internal components of the reactor, which is also one of the main reasons why the current coal tar slurry bed hydrogenation unit cannot operate stably for a long period of time

Method used

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  • Hydrogenation method for coal tar combination bed and system used for coal tar combination bed hydrogenation
  • Hydrogenation method for coal tar combination bed and system used for coal tar combination bed hydrogenation
  • Hydrogenation method for coal tar combination bed and system used for coal tar combination bed hydrogenation

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Embodiment 1

[0131] Based on the total weight of the coal tar raw material, the dosage of the slurry bed catalyst is 1.0% by weight based on the active metal elements contained therein. After mixing the coal tar raw material in Table 1 with the aforementioned highly dispersed heterogeneous slurry bed catalyst, they enter the slurry bed hydrogenation reactor together with hydrogen for gentle hydrogenation treatment, and the outflow of the slurry bed hydrogenation reactor The product enters the first separation unit for gas-liquid separation, and water is separated, and the separated liquid hydrocarbon product enters the fractionation tower, and the distillation is cut into light distillate, middle distillate and heavy distillate. Taking the corresponding heavy fraction in the coal tar raw material entering the slurry bed hydrogenation reactor as a benchmark, the conversion rate of the heavy fraction is controlled to be 50%. 50% by weight of the heavy fraction cut out by the distillation tow...

Embodiment 2

[0140] Present embodiment adopts the method similar to embodiment 1 to carry out, and difference is:

[0141] Based on the total weight of the coal tar raw material, the dosage of the slurry bed catalyst is 1.5% by weight based on the active metal elements contained therein. The coal tar raw material is uniformly mixed with the aforementioned high-dispersion heterogeneous slurry-bed catalyst, and then enters the slurry-bed hydrogenation reactor together with hydrogen for mild hydrogenation treatment. Taking the corresponding heavy fraction in the coal tar raw material entering the slurry bed hydrogenation reactor as a benchmark, the conversion rate of the heavy fraction in the slurry bed hydrogenation reactor is controlled to 65%. 60% by weight of the heavy fraction cut out of the fractionation tower is thrown out of the device, and the rest of the heavy fraction is recycled back to the slurry bed hydrogenation reactor for further conversion. Other main operating conditions a...

Embodiment 3

[0149] Present embodiment adopts the method similar to embodiment 1 to carry out, and difference is:

[0150] Based on the total weight of the coal tar raw material, the dosage of the slurry bed catalyst is 0.15% by weight based on the active metal elements contained therein. The coal tar raw material is uniformly mixed with the aforementioned high-dispersion heterogeneous slurry-bed catalyst, and then enters the slurry-bed hydrogenation reactor together with hydrogen for mild hydrogenation treatment. Taking the corresponding heavy fraction in the coal tar raw material entering the slurry bed hydrogenation reactor as a benchmark, the conversion rate of the heavy fraction in the slurry bed hydrogenation reactor is controlled to be 35%. Wherein the heavy fraction of 40% by weight cut out by the first fractionation system is thrown out of the device to control the solid content in the slurry bed hydrogenation reactor and maintain the active stability of the catalyst in the slurry...

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Abstract

The invention relates to the field of coal tar processing, and discloses a hydrogenation method for a coal tar combination bed and a system used for coal tar combination bed hydrogenation. The methodcomprises the following steps: introducing a coal tar raw material, and performing water removing and / or impurity removing pretreatment; performing mild-hydrogenation treatment on the above materialsunder hydrogen and a slurry bed catalyst; performing gas-liquid separation on obtained materials, and performing fractional distillation to obtain a light distillate, an intermediate distillate and aheavy distillate; recycling the remainder heavy distillate to a slurry bed reactor, and performing mild-hydrogenation treatment; performing a hydrogenation refining reaction on the light distillate and the intermediate distillate; and performing gas-liquid separation on an effluent of a refining reactor, and performing fractional distillation to obtain a naphtha distillate, a diesel oil distillateand a wax oil distillate. According to the invention, a combination of a slurry bed and a static bed is utilized, thus clean and high-efficiency utilization of a coal tar resource is realized, a liquid yield and a utilization ratio and utilization value of the coal tar resource are improved, and a running period of a device is prolonged to a certain degree.

Description

technical field [0001] The invention relates to the field of coal tar processing, in particular to a coal tar combined bed hydrogenation method and a coal tar combined bed hydrogenation system. Background technique [0002] With the sustained and rapid development of social economy, my country's demand for petroleum products is also increasing. [0003] However, petroleum is a non-renewable energy source and is facing a crisis of depletion. In contrast, China has relatively abundant coal reserves, so producing liquid fuel from coal has become a basic direction of coal processing and utilization. [0004] With the rapid growth of the international and domestic steel industry, the coking industry presents a high growth trend, the output of coal tar is increasing, and the clean processing and effective utilization of coal tar are becoming more and more important. At present, the conventional coal processing method is to cut various fractions with concentrated components throu...

Claims

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Application Information

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IPC IPC(8): C10G67/02
Inventor 李猛王蕴王卫平吴昊黄放
Owner CHINA PETROLEUM & CHEM CORP
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