Catalytic conversion method for producing high-cetane number light diesel oil and low-olefin gasoline

Abstract

The invention relates to a catalytic conversion method for producing high-cetane number light diesel oil and low-olefin gasoline, which comprises the following steps of: making raw oil contact mitigated converting catalyst with rough grain diameter distribution in a mitigated converting reactor for reacting, wherein the reaction temperature, oil and gas retaining time and the weight ratio of the mitigated converting catalyst to the raw oil are enough to obtain a reaction product containing catalytic wax oil which accounts for 12-60 percent by weight of raw oil, and the reaction product also comprises high-cetane number diesel oil and gasoline; carrying out cracking reaction on the catalytic wax oil in a harsh converting reactor; carrying out hydrogen transfer reaction and isomerization reaction on the generated oil and gas in a certain reaction environment; and separating to obtain a reaction product containing low-olefin gasoline. The method can directly produce high-cetane number light diesel oil and low-olefin gasoline simultaneously by catalytic cracking and reduce the catalyst breakage tendency and catalyst consumption.

Description

technical field

[0001] The invention relates to a catalytic conversion method for improving the quality of catalytic cracking light diesel oil and gasoline. More specifically, it is a method of maximally increasing the cetane number of catalytically cracked light oil oil while reducing the olefin content of catalytic gasoline by catalytic cracking. Background technique

[0002] Worldwide demand for high-quality diesel is increasing, while demand for fuel oil is decreasing. Although the increase in demand for gasoline and diesel varies from region to region, overall, the growth rate of demand for diesel worldwide will exceed the growth rate of demand for gasoline. Therefore, more catalytic light diesel oil with low cetane number is being used as a blending component of diesel oil. In order to meet the demand for high-quality diesel oil, it is necessary to upgrade the catalytic light diesel oil, or directly produce a large amount of high-quality catalytic light diesel oil th...

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