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High-value utilization method for oxygen-enriched coal tar

A coal tar, high-value technology, applied in the field of coal chemical industry, can solve the problems of increasing the hydrogen-oil volume ratio due to water pressure, economical uneconomical, and increased water content.

Active Publication Date: 2012-12-05
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high oxygen content of the raw material, the water content of the product increases accordingly. In order to reduce the water pressure in the hydrogenation process, the volume ratio of hydrogen to oil must be increased, which is not economical.

Method used

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  • High-value utilization method for oxygen-enriched coal tar
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  • High-value utilization method for oxygen-enriched coal tar

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Embodiment

[0025] The raw material coal tar composition and main properties are listed in Table 1 in the specific examples of the present invention. The raw material oxygen-enriched coal tar has an organic oxygen content of 8.7%. It is divided into crude phenol oil and dephenolized fraction oil in the phenol extraction unit. The organic oxygen content in the dephenolized fraction oil is 1.8%. The crude phenol oil is used for phenol refining, and the dephenolized fraction The oil in the hydroconversion unit adopts a two-stage series hydrogenation process of hydrorefining and hydrocracking. The comparison between oxygen-enriched coal tar hydrogenation process and dephenolized distillate oil hydrogenation process is shown in Table 2. Table 2 mainly lists the changes in indicators such as hydrogen consumption, hydrogen-to-oil ratio, and generated water content. The high-value utilization method of oxygen-enriched coal tar of the present invention also has advantages in aspects such as equip...

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Abstract

The invention relates to a high-value utilization method for oxygen-enriched coal tar. The method comprises the following steps of: first separating the oxygen-enriched coal tar into coarse phenol oil and dephenolization distillate oil in a phenol extraction unit, and performing hydrogenation reaction on the dephenolization distillate oil in a hydro-conversion unit to obtain an oxygen-enriched gas phase product and a hydrogenation liquid phase product in which hydrocarbon is taken as a main component; and performing alkali wash on the oxygen-enriched gas phase product to allow the oxygen-enriched gas phase product to enter the front end of the hydro-conversion unit and recycling, allowing the hydrogenation liquid phase product to enter a fractional distillation unit to separate out naphtha and diesel oil products, allowing tail oil to enter the hydro-conversion unit, and mixing the tail oil and the dephenolization distillate oil, wherein a mixture of tail oil and dephenolization distillate oil is used as a hydrogenation raw material. According to the method, the coal tar raw materials are subjected to high-value utilization, and the running cycle of the hydro-conversion unit can be prolonged.

Description

technical field [0001] The invention belongs to the field of coal chemical industry and relates to a high-value utilization method of oxygen-enriched coal tar. Background technique [0002] Coal tar is a by-product of the coking industry, and its composition is mainly aromatic hydrocarbons. With the rapid growth of the international and domestic steel industry, the coking industry has also developed rapidly, and the output of coal tar has also continued to increase. The clean processing and utilization of coal tar has become more and more important. At present, some domestic coal tar production enterprises mainly deal with coal tar by extracting and separating chemical products such as phenol and naphthalene after acid-base refining, or burning it as inferior fuel oil directly or emulsifying it as fuel, which not only has poor economic benefits, but also pollutes environment, the value of coal tar is not maximized. [0003] Patent CN1676583A is a two-stage medium-high temp...

Claims

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Application Information

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IPC IPC(8): C10G67/14
Inventor 李春山王红岩阚涛张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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