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Method for reducing aromatic content of diesel oil in residual hydrogenation equipment

A technology for residual oil hydrogenation and diesel oil, applied in the direction of aromatic hydrocarbon hydrogenation refining, etc., can solve the problems of increased investment, increased hydrogen consumption, high-pressure device investment and high operating costs

Inactive Publication Date: 2003-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the investment of this method is small, for heavy oil catalytic cracking diesel with high aromatic content, a hydrocracking reaction with a relatively high conversion depth must occur, and part of the diesel components in the raw material are converted into gasoline components after hydrocracking. points, resulting in a decrease in the yield of diesel fractions and an increase in hydrogen consumption
[0006] 3. High-pressure hydrofining: Although this method can saturate aromatics to a large extent, the investment and operating costs of high-pressure devices are very high
This method requires an additional hydrorefining reactor, which increases the investment, and only the distillate in the device is refined.

Method used

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  • Method for reducing aromatic content of diesel oil in residual hydrogenation equipment

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The diesel feedstock is a heavy oil catalytic cracking diesel, and its properties are shown in Table 1. The catalyst used in the test was produced by the Catalyst Factory of Changling Refining and Chemical Co., Ltd., Sinopec Corporation, and the trade name was RN-10. The gas from the hot high-pressure separator of the residual oil hydrogenation test device is used as the circulating gas of the diesel hydrofining test device. The total pressure of the circulating gas is 15.3MPa, and the hydrogen partial pressure is 14.0MPa. 2 The S content is 32000ppm. The cycle gas contains a certain amount of diesel and naphtha components. Other conditions for diesel hydrotreating are: temperature 350°C, diesel air velocity 1.0h -1. See Table 2 for the yield of various fractions of diesel oil refined and the properties of diesel oil. It can be seen from Table 2 that the diesel yield exceeds 100%, and a certain amount of naphtha is produced, and the diesel part and naphtha exceeding...

Embodiment 2

[0033] Compared with Example 1, the diesel hydrotreating reaction temperature is 380°C, and other operating conditions of diesel feedstock and catalyst are exactly the same as those of Example 1. The properties of hydrogenated oil are shown in Table 2. It can be seen from Table 2 that the aromatics content of the diesel is less than 15% by weight, the cetane number is 46.8, and the sulfur and nitrogen contents are respectively less than 10ppm and 1ppm. The properties of the diesel oil have been greatly improved and become a very good diesel blending component.

Embodiment 3

[0035] The diesel feedstock is a heavy oil catalytic cracking diesel, and its properties are shown in Table 1. The catalyst used in the test was produced by the Catalyst Factory of Changling Refining and Chemical Co., Ltd., China Petroleum & Chemical Corporation, and the trade name was RN-10. The gas from the hot high-pressure separator of the residual oil hydrogenation test device is used as the circulating gas of the diesel hydrofining test device. The total pressure of the circulating gas is 15.3MPa, and the hydrogen partial pressure is 14.0MPa. The hydrogen sulfide content in the ring gas is 32000ppm. In order to directly investigate the effect of this method on the improvement of FCC diesel oil and eliminate the influence of diesel oil and naphtha entrained in the recycle gas, in this embodiment and the following examples, the recycle gas is first cooled and separated Diesel and naphtha fractions, gas and FCC diesel are mixed and heated to reaction temperature for reacti...

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Abstract

The method for reducing aromatic hydrocarbon content in diesel oil in residual hydrogenation equipment is characterized by that the residual oil and hydrogen gas are fed into residual catalytic hydrogenation reactor, and the material flow obtained after reaction is fed into thermal high-pressure separator and separated into gas phase material flow and hydrogenated residuel oil, and gas phase material flow is mixed with diesel oil raw material, and fed into diesel oil catalytic hydrogenation reactor, and the reaction material flow is fed into cold high-pressure separator, and separated into gas and refined diesel oil generation oil, the gas is cleaned, pressurized and returned into residual hydrogenation reactor for circular use, and the refined diesel oil generation oil can be separated to obtain the diesel oil product whose aroamtic hydrocarbon content can be reduced by above 60%.

Description

technical field [0001] The invention belongs to a method for refining hydrocarbon oil in the presence of hydrogen, more specifically, a method for reducing the aromatic content of diesel oil in a residual oil hydrogenation unit. Background technique [0002] Diesel diesel specifications are becoming increasingly stringent, especially for its aromatics content and cetane number indicators. In the world fuel specifications formulated by the Engine Manufacturers Association (EMA) of the United States, Europe and Japan, Class 2 diesel requires that the aromatics content not exceed 25% by weight, and the cetane number is not lower than 53; Class 3 diesel standards require that the aromatics content not exceed 15% by weight, cetane number not less than 55. FCC diesel fraction has high density, high aromatics content and low cetane number, especially heavy oil FCC diesel has worse properties. In view of this, this type of diesel cannot be directly used as diesel products, and mus...

Claims

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Application Information

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IPC IPC(8): C10G45/44
Inventor 牛传峰李大东戴立顺石玉林石亚华刘学芬
Owner CHINA PETROLEUM & CHEM CORP
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