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Processing method of medium-low temperature coal tar

A technology of low temperature coal tar and processing method, which is applied in the field of processing medium and low temperature coal tar by hydrorefining method, can solve the problems such as the inability to realize long-term operation of a hydrogenation unit, the problem of olefin coking, and the impact on the economy of the processing unit, and the like. Achieve the effect of improving the utilization rate and the economy of processing equipment, realizing long-term operation, and solving the problem of coking

Active Publication Date: 2012-05-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the light fraction obtained from raw material fractionation directly enters the hydrotreating reactor, which still does not solve the problem of coking of olefins during the heating process, and cannot realize the long-term operation of the hydrogenation unit; in addition, the phenol in some medium and low temperature coal tar Phenolic compounds are evenly distributed, not only in the <270°C fraction, but also in the diesel fraction and light fraction. This method only purifies the phenolic compounds in the <270°C fraction, and the The phenolic compounds in the distillate are not treated in any way, and are only used as raw materials for coking, but phenolic compounds are not ideal components for coking reactions, so this method still does not make full use of the high value-added components in the raw materials, which affects the processing Economics of the installation

Method used

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  • Processing method of medium-low temperature coal tar
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  • Processing method of medium-low temperature coal tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The properties of the medium and low temperature coal tar used in the Lurgi method are shown in Table 1. The pre-hydrofining catalyst can choose the FHRS-1 catalyst developed and produced by Fushun Petrochemical Research Institute, the hydrogenation protection catalyst can choose the FZC-103 catalyst developed and produced by Fushun Petrochemical Research Institute, and the conventional hydrofining catalyst uses Fushun Petrochemical Research Institute The properties of the 3936 hydrotreating catalyst developed and produced are shown in Table 2.

[0029] Table 1 Raw Oil Properties

[0030] Raw oil name

[0031] Olefin

[0032] The main composition and properties of the catalyst used in table 2

[0033] catalyst

[0034] The acid-base extraction was carried out with the low-temperature coal tar light distillate in the Lurgi method as a raw material, and the alkali used was an alkali solution with a weight concentration of 8% sodium hydroxide...

Embodiment 2

[0044] Catalyst used, raw material and hydrogenation process condition are identical with embodiment 1, and condition 2 is the same as condition 2 in embodiment 1, and difference is that condition 3 directly carries out pre-hydrogenation refining / Hydrofining, that is, directly enter the hydrogenation reactor without dephenolization treatment. The test results are shown in Table 5.

[0045] The light fraction of medium and low temperature coal tar directly enters the hydrogenation reactor without dephenolization treatment, which increases the processing load of the hydrogenation unit, and the phenolic compounds in the raw material are partially converted into water and blended with fuel oil whose price is lower than that of crude phenolic products Components, while also increasing the hydrogen consumption; while the method of first dephenolization and then hydrogenation will significantly improve the economy.

[0046] Table 5 embodiment 2 test result

[0047]

Embodiment 3

[0049] The catalyst and raw materials used are the same as those in Example 1 and Condition 2, and a 5000-hour stability comparison test is carried out. The process conditions are shown in Table 6, and the test results are shown in Table 7.

[0050] Condition 4: No pre-hydrofining process is used, and the dephenolized oil directly enters the hydrotreating reactor. After 3000 hours, the pressure drop of the hydrotreating reactor has reached 0.3 MPa, which is close to the maximum value allowed by the industrial hydrogenation unit. Shutdown treatment is required, and most of the area above the heat exchanger and the protective agent bed of the hydrotreating reactor It is covered with a thick layer of carbon deposits.

[0051] Condition 5: Pre-hydrofinishing is used and then hydrofinishing reaction is carried out. The hydrogenation unit has been in operation for 5,000 hours, and the pressure drop of the hydroprocessing reactor has been significantly reduced to 0.10MPa, which can ...

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Abstract

The invention discloses a processing method of medium-low temperature coal tar. According to the method, whole fraction of the medium-low temperature coal tar which has been undergone dehydration and slag removal is firstly distilled to obtain a light fraction and a heavy fraction. The heavy fraction is used as modified asphalt or heavy fuel oil and the like. A phenolic compound is separated from the light fraction by an acid-base extraction method so as to obtain a crude phenol product. Hydrogenation saturation of alkene from dephenolized raw oil is carried out by a hydro-pretreating method. The prehydrogenation raw oil contacts with a main hydrofining catalyst for desulphurization, nitrogen removal, aromatic saturation and other reactions. In comparison with the prior art, by the adoption of the method provided by the invention, components which influence long-term operation of a hydrogenation device can be fundamentally removed; the operation period of the device can be obviously prolonged; the crude phenol product can be obtained; and the utilization rate of raw materials and the whole economy of a processing device can be raised.

Description

technical field [0001] The invention relates to a method for processing medium-low temperature coal tar, in particular to a method for processing medium-low temperature coal tar by adopting a hydrogenation refining method. Background technique [0002] The increasing scarcity of the world's petroleum resources has made the technology of processing various unconventional petroleum resources to produce light fuel oil a hot topic, one of which is to produce clean fuels from coal tar. [0003] Medium and low temperature coal tar refers to the product obtained when lignite or young bituminous coal is carbonized at about 550-800 ° C, which mainly contains aromatics, alkanes, phenols and unsaturated hydrocarbons; The obtained by-products, the main product is coke, which is mainly a complex mixture composed of aromatic hydrocarbons, that is, there are fundamental differences in the composition of medium and low temperature coal tar and high temperature coal tar, and the two are also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/14C10C1/00C07C37/72C07C39/00
Inventor 许杰
Owner CHINA PETROLEUM & CHEM CORP
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