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Method for hydrotreating ethylene tar

A technology for ethylene tar and hydrocracking, which is applied in the fields of hydrotreating process, hydrocarbon oil treatment, petroleum industry, etc., and can solve the problems that the ethylene tar fraction cannot be processed and has not been effectively treated.

Active Publication Date: 2014-07-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method only utilizes the light fraction which accounts for a small proportion in ethylene tar, and more than 80% of the ethylene tar fraction has not been effectively treated; at the same time, the hydrorefining conditions it provides cannot handle ethylene with a boiling point higher than 280 ° C. tar fraction

Method used

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  • Method for hydrotreating ethylene tar
  • Method for hydrotreating ethylene tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0053] The properties of the light fraction and heavy fraction of ethylene tar used are shown in Table 2 and Table 4. The embodiment uses a series process to process the light fraction of ethylene tar, using two reactors, the first reactor is equipped with the hydrogenation protection agent FZC-103 and the hydrorefining catalyst 3936, and the upper part of the second reactor is filled with the hydrodecarbonization catalyst HDC -3. The first hydrocracking catalyst packed in the middle part is a hydrocracking catalyst containing amorphous silica alumina and Y molecular sieve, and the second hydrocracking catalyst packed in the lower part is a hydrocracking catalyst containing amorphous silica alumina and β molecular sieve. . In the embodiment, the volume ratio of FZC-103: 3936: HDC-3: first hydrocracking catalyst: second hydrocracking catalyst is as follows: 12:19:19:25:25. The results of the reaction are shown in Table 3. In addition, the device has been tested for 5000 hours ...

Embodiment 4

[0061] use figure 1 In the process shown, the heavy fraction of ethylene tar (see Table 4 for properties) successively passes through the hydrogenation protection catalyst, the hydrode-residual catalyst and the hydrogenation conversion catalyst, and the volume ratio is 10:40:50. The hydrogenation protection catalyst used is FZC-100 and FZC-102B, the volume ratio is 1:2, the hydroconversion catalyst such as CN02109422.5, the catalyst obtained in Example 1 is denoted as ZH1, and its properties are shown in Table 5.

[0062] Table 5 Composition and properties of the hydroconversion catalyst

[0063]

[0064] The used hydrodecarbonization catalyst HDC-1 and HDC-2 have a filling volume ratio of 4:6. The filling sequence of the ethylene tar heavy fraction hydrogenation catalyst is as follows: FZC-100, FZC-102B, HDC-1, HDC-2, ZH1. In this embodiment, the weight ratio of the weight of the hot low-fraction oil circulating back to the hydrogenation reaction zone to the heavy fraction of...

Embodiment 5

[0066] Compared with Example 4, using the thermal high-fraction oil cycle, the weight ratio of the weight of the thermal high-fraction oil circulating back to the hydrogenation reaction zone to the heavy fraction of the ethylene tar is 2.0, and the used hydrodecarbonization catalyst The filling volume ratio of HDC-1 and HDC-2 becomes 5:5, and the rest is the same as in Example 4.

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Abstract

The invention discloses a method for hydrotreating ethylene tar, which comprises the following steps of: performing fractional distillation on the ethylene tar by selecting a proper cutting point to obtain light and heavy fractions; making the light fraction contact a hydrogenation protective agent, a hydrogenation refining catalyst, a hydrogenation carbon residue catalyst and a hydrocracking catalyst in turn, reacting to obtain products, and separating the products to obtain gasoline and diesel fractions; and making the heavy fraction contact a hydrogenation protecting catalyst, a hydrogenation carbon residue removing catalyst and a hydro-conversion catalyst in turn to obtain hydro-conversion generated oil, wherein partial hydro-conversion generated oil is circulated to enter a hydrogenation reaction area, and the rest hydro-conversion generated oil is separated to form gasoline and diesel fractions. In the method, according to composition characteristics of the light and heavy fractions of the ethylene tar, different hydrotreating schemes are selected, so that the ethylene tar is converted into fuel oil to the greatest extent, the problem of high temperature rise of a hydrogenation reactor bed can be effectively solved, the running period of the device is prolonged, full fractions of the ethylene tar are fully utilized and the added value of the ethylene tar is improved.

Description

Technical field [0001] The invention relates to a method for hydrotreating ethylene tar. Background technique [0002] The increasing scarcity of world oil resources and the rising prices have made it necessary for refineries to reduce emissions and increase efficiency. Ethylene tar is currently mainly sold as heavy fuel oil or carbon black raw materials, with low added value. [0003] Ethylene tar is a high-temperature condensation product of raw materials and products in the steam cracking process of ethylene cracking raw materials. Its initial boiling point is 170-260°C, and its final boiling point is greater than 600°C, generally 600-700°C, which belongs to the range of heavy fractions. Ethylene tar is mainly a mixture of fused-ring aromatic hydrocarbons above bicyclic rings, with aromatic hydrocarbon content of more than 90% and density (20°C) greater than 1.0g / cm 3 , The content of impurities such as sulfur and nitrogen is low, and it is basically free of metal impurities. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/00
Inventor 许杰关明华
Owner CHINA PETROLEUM & CHEM CORP
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