Diesel oil fraction hydrogenating modification process

Abstract

The diesel oil fraction hydrogenating modification process includes the contact of the mixture of material oil and hydrogen with the hydrotreating catalyst or the contact of the mixture of material oil and hydrogen with the hydrorefining catalyst and the hydrotreating catalyst successively, cooling and separating the reacted effluent, reusing the hydrogen-rich gas circularly, and fractionating the liquid product in the fractionating system to obtain diesel oil fraction and naphtha fraction. The process makes it possible to process inferior diesel oil fraction with banal boiling point in mild operation condition and can raise the cetane number greatly, lower the content of polycyclic aromatic hydrocarbon, S and N and reduce the density. In addition the process has high volume space velocity, low operation cost and high product yield.

Description

technical field

[0001] The invention belongs to a method for refining hydrocarbon oil in the presence of hydrogen, more specifically, it belongs to a method for hydrogenation and upgrading of diesel fractions. Background technique

[0002] With the strengthening of people's awareness of environmental protection, countries around the world have increasingly strict requirements on the content of impurities such as sulfur and nitrogen in diesel products, as well as the content of aromatics and cetane number. China's fuel oil standards are also constantly improving. The three major cities of Beijing, Shanghai and Guangzhou have taken the lead in implementing Euro III emission standards since 2005, which require that the sulfur content of diesel oil is not more than 0.035% by weight and the cetane number is not less than 51. The content of polycyclic aromatic hydrocarbons is not more than 11% by weight. Therefore, reducing the sulfur and nitrogen content of diesel fractions, inc...

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