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Method of gasoline desulfurization

A gasoline and heavy gasoline technology, applied in the petroleum industry, processing hydrocarbon oil, refining hydrocarbon oil, etc., can solve the problems of reducing total sulfur, exceeding gasoline index requirements, low reaction temperature, etc., and achieving the effect of no loss of octane number

Inactive Publication Date: 2004-03-03
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The disadvantage is that most of the remaining sulfur compounds in the final product are mercaptan sulfur compounds, resulting in unqualified mercaptan sulfur in the product
[0009] Due to the high space velocity and low reaction temperature, some mercaptan compounds leave the catalyst bed before undergoing hydrodesulfurization reaction, resulting in a small amount of mercaptan sulfur in the product, resulting in a mercaptan sulfur content greater than 10ppm in the final product. Exceeding gasoline index requirements
The conventional sweetening method is fixed-bed oxidative sweetening, which reduces the sulfur content of mercaptans by converting mercaptan sulfur into disulfides, but does not reduce the total sulfur

Method used

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  • Method of gasoline desulfurization
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Embodiment 1

[0031] Using FCC gasoline A as the raw material, the raw material is cut first, and the resulting heavy gasoline fraction and hydrogen are contacted with the catalyst RSDS-1 at a hydrogen partial pressure of 1.6MPa, a reaction temperature of 290°C, and a liquid hourly space velocity of 4.0h -1 , hydrogen oil ratio 400Nm 3 N m 3Carry out hydrodesulfurization under the condition; Different from the comparative example, the effluent of the hydrodesulfurization reaction goes to hydrodemercaptan instead of oxidative sweetening, and the effluent of the hydrodesulfurization reaction passes through the cold high-pressure separator to separate the gas phase, The remaining liquid phase is mixed with new hydrogen and then contacted with the catalyst RSS-1A, and the effluent enters the high-pressure separator and the stabilization tower in turn to obtain qualified products; the hydrogen-rich gas separated from the high-pressure separator is boosted by the circulating compressor and then r...

Embodiment 2

[0033] Using FCC gasoline B as the raw material, the raw material is cut first, and the obtained heavy gasoline fraction and hydrogen are contacted with the catalyst RSDS-1 at a hydrogen partial pressure of 1.6MPa, a reaction temperature of 300°C, and a liquid hourly space velocity of 4.0h -1 , hydrogen oil ratio 400Nm 3 / m 3 Hydrodesulfurization is carried out under certain conditions; after the effluent of the hydrodesulfurization reaction passes through the cold high-pressure separator to separate the gas phase, the remaining liquid phase is mixed with new hydrogen and then contacted with the catalyst RSS-1A, and the effluent enters the high-pressure separator, Qualified products are obtained from the stabilizing tower; the hydrogen-rich gas separated from the high-pressure separator is boosted by a circulating compressor and then returned to the hydrotreating reactor for recycling. The properties of the distillate after hydrodesulfurization are shown in Table 1, and the p...

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Abstract

A process for desulfurizing gasoline includes such steps as dividing raw gasoline into light gasoline fraction and heavy gasoline fraction, hydrodesulfurizing the heavy one, separating gas phase from the resultant by high-pressure separator, mixing residual liquid with fresh H2, hydrodesulfurizing again, separating H2-enriched gas by said separator for cyclic use, and stabilizing in stabilizing tower to obtain qualified product.

Description

technical field [0001] The present invention pertains to a process for refining hydrocarbon oils in the presence of hydrogen, and more particularly to a process for the hydrogenation of gasoline fractions. Background technique [0002] As people's awareness of environmental protection continues to increase, the specifications of motor gasoline indicators such as oxygen content, vapor pressure, benzene content, total aromatics content, boiling point, olefin content and sulfur content will become more and more stringent, especially sulfur content. At present, 90-99% of the sulfur in domestic finished gasoline comes from catalytic cracking (FCC) gasoline. Therefore, reducing the sulfur content of FCC gasoline is the key to reducing the sulfur content of finished gasoline. There are many methods for producing low-sulfur gasoline abroad, mainly including FCC raw material hydrogenation pretreatment (pre-hydrogenation), FCC gasoline post-treatment and the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G45/00C10G45/02
CPCC10G45/08C10G45/12C10G2300/202
Inventor 石玉林习远兵胡云剑戴立顺
Owner CHINA PETROLEUM & CHEM CORP
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